Browse Topic: HCCI engines

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Methanol mixing controlled combustion process enabled by onboard methanol dehydration to dimethyl ether (DME)2026-01-0322To be published on 04/07/2026
This work demonstrates an initial proof-of-concept approach for operating a compression ignition off-road and marine relevant engine using neat methanol. The approach utilizes mixing controlled compression ignition (MCCI) of methanol that is enabled by a homogeneous charge compression ignition (HCCI) pre-burn of mostly premixed DME. Although two fuels are used, this work explores and evaluates the opportunity and performance to generate the premixed fuel via methanol catalytic dehydration over an alumina catalyst at engine relevant temperatures, pressures, and space velocities. Detailed bench flow reactor studies of the catalytic dehydration species output and conversion purity results are then coupled with single-cylinder experiments of both the characterized output species for pre-burn HCCI performance. Subsequent initial methanol MCCI performance is also evaluated and compared relative to conventional diesel combustion. The detailed flow reactor results show that the catalytic
Jatana, Gurneesh, Splitter, Derek, Park, Yeonshil, Szybist, James, Svensson, Kenth, Montgomery, David
Reactivity Controlled Compression Ignition (RCCI) Combustion Engine Characteristics Fuelled with Diesel/Compressed Natural Gas (CNG) and Diesel/Methanol Fuel Pairs2026-01-0319To be published on 04/07/2026
Ultra-low oxides of nitrogen (NOx) and particulate matter (PM) characteristics of reactivity controlled compression ignition (RCCI) combustion has motivated the researchers to explore more so that this can be implemented using a long range of alternative fuels. In this study, a comparative analysis of combustion, performance, and emission characteristics of RCCI combustion fuelled with diesel/compressed natural gas (CNG) and diesel/methanol fuel pairs have been carried out with respect to baseline compression ignition (CI) combustion. All experiments were performed in a constant speed engine at four different engine loads. The RCCI combustion experiments were performed at a constant premixed ratio (rp) of 0.50 and 15% exhaust gas recirculation (EGR). The results exhibited a significant reduction in oxides of nitrogen (NOx) emissions and relatively smoother RCCI combustion compared to baseline CI combustion. RCCI mode combustion resulted in relatively superior engine performance
Saikia, Bhargav, Kant, Akshay, Gupta, Abhishek, Singh, Akhilendra Pratap
A Comprehensive Study on the Effect of Compression Ratio and Pilot Injection Strategy on Alcohol Compression Ignition03-18-07-004411/13/2025
Achieving compression ignition (CI) with ethanol, a renewable fuel, comes with challenges because of its much lower cetane number compared to diesel. Additionally, ethanol’s high cooling potential and high volatility compared to diesel also offer challenges and opportunities to achieving robust, high-efficiency CI. Increasing the compression ratio (CR) and expanding the injection strategy beyond a conventional close-coupled pilot-main diesel injection strategy can help overcome these challenges. This work experimentally tested ethanol CI with several different injection strategies with CRs ranging from 16.3 to 22.3. The results showed that in homogeneous charge CI (HCCI), increasing the CR improved thermal efficiency but incurred a combustion efficiency penalty. In any CI concept, increasing the CR lowered the required intake temperature to achieve ignition. Using close-coupled pilot injections is an effective way to achieve ethanol CI, but it was also shown that HCCI-like intake
Gainey, Brian, Vedpathak, Kunal, Kumar, Mohit, Lawler, Benjamin
Effect of Plasma-Assisted Ignition on Combustion and Emission Characteristics of Two Stroke Engines with Different Fuels2025-32-003011/3/2025
This study explores the effect of plasma-assisted ignition (PAI) on combustion stability and emissions in two-stroke spark-ignition engines. Two engine platforms were evaluated: a conventional single-cylinder two-stroke engine and a thermodynamically advanced opposed-piston two-stroke (OP2S) engine. The OP2S engine configuration offers reduced heat loss and higher power density due to its uniflow scavenging and favorable geometry, but suffers from high residual gas fraction, which increases ignition difficulty and combustion instability. To address this, nanosecond-pulsed PAI was applied in various spatial arrangements and discharge voltages, using both gasoline and a low-reactivity gasoline/DMC blend fuel. Spark ignition timing was held constant at the minimum advance for best torque across all tests. Combustion stability was assessed via indicated mean effective pressure (IMEP) and its coefficient of variation, while CO and HC emissions were measured as environmental indicators
Liu, Jinru, Yamazaki, Yoshiaki, Otaki, Yusuke, Kato, Hayato, Kobayashi, Daichi, Umegaki, Tetsuo, Asai, Tomohiko, Iijima, Akira
Effects of Intake-Air Heating on a Light-Duty CNG-Diesel Reactivity-Controlled Compression Ignition Engine2025-32-000311/3/2025
Reactivity controlled compression ignition (RCCI) is a promising low-temperature combustion strategy that offers high thermal efficiency with reduced nitrogen oxides (NOx) and soot emissions. However, at low loads, RCCI operation often suffers from incomplete combustion, leading to elevated partial combustion products, such as, unburned total hydrocarbons (THC) and carbon monoxide (CO) emissions. Intake-air heating is a potential strategy to address these issues by enhancing fuel reactivity and promoting more complete combustion. In this study, the effects of intake-air heating (from ambient to ~95°C) on performance, combustion, and emissions were experimentally investigated in a light-duty diesel engine operated in compressed natural gas (CNG)-diesel RCCI mode. Experiments were conducted at low and intermediate loads at various engine speeds. A single injection strategy was employed for low-load, while a double-injection strategy was used at intermediate-load operating condition s. CO
Navaneethakrishnan, P., Sarangi, Asish K, Suman, Abhishek, Sreedhara, Seshadri, Singh, Arvind Kumar
Analysis of Combustion Characteristics and Performance of a Multi-Cylinder Engine Operating on Syngas/Diesel in Dual-Fuel Mode2025-24-00429/7/2025
Despite improvements in internal combustion engine efficiency, fossil fuel reliance remains a challenge for sustainable energy. Syngas, a hydrogen-carbon monoxide mixture produced from gasification, typically of carbon-based feedstocks, offers a viable transitional fuel due to its compatibility with existing combustion technologies and reduced emissions. However, its low ignition propensity elevated intake temperatures or pressures, a limitation that can be overcome through diesel pilot injection in dual-fuel engine configurations. This study extends prior single-cylinder research to a 1.6 L four-cylinder HCCI engine operating in dual-fuel mode, resembling a Reactivity Controlled Compression Ignition (RCCI) engine. The analysis focuses on cylinder-to-cylinder combustion variation, thermal efficiency, and pollutant emissions, with particular emphasis on the influence of diesel pilot injection timing. Experimental evaluations are conducted across a range of injection timing and Syngas
El Younsi, Laila, Nelson-Gruel, Dominique
The Effect of Nitric Oxide (NO) on the Reactivity of Ethanol and Gasoline: An Experimental Study2025-01-84134/1/2025
Achieving stable HCCI combustion requires specific in-cylinder boundary conditions. Trace residual species, such as nitric oxide (NO), can have an impact on the reactivity, and thus the combustion stability, of different fuels in HCCI. This study investigates the effects of nitric oxide (NO) on the reactivity and combustion stability of ethanol and gasoline in a single-cylinder HCCI engine. The promoting and inhibiting impact of NO on iso-octane’s ignition delay time are available in the literature; nevertheless, as a baseline study, these effects on the autoignition of gasoline were documented in this work. For ethanol, the NOx concentration seeded in the intake air varied from 0-1000 ppm while maintaining a constant combustion phasing (CA50 at 7.5 CAD) and a global equivalence ratio of 0.34. Ethanol exhibited a linear reduction in intake temperature, decreasing by 47 K with 927 ppm NO. For gasoline, a 225-ppm increase in NO reduced the intake temperature required for HCCI by 40 K
Bhatt, Ankur, Gandolfo, John, Vedpathak, Kunal, Lawler, Benjamin, Gainey, Brian
Assessment of Performance and Emissions from a Hybrid Vehicle Integrated with a Low Temperature Combustion Engine Undergoing a Drive Cycle2024-28-014012/5/2024
In the last decade, the increased global temperature, stringent regulations, and customer demand for high fuel economy have led to the accelerated development of alternative propulsion solutions, with particular focus on electrified vehicles. Hybrid electric vehicles (HEVs), the combination of electric machinery with conventional powertrains, allows diversifications of powertrain architectures. In addition, it has been demonstrated that engines employing advanced low temperature combustion concepts, such as dual fuel reactivity controlled compression ignition (RCCI), and able to operate on both renewable and conventional fuels, produce ultra-low nitrogen oxides (NOx) and particulate matter (PM) emissions while maintaining thermal efficiency similar to conventional diesel operation at part load operating conditions. This study aims to investigate the potential of integrating a gasoline-diesel RCCI engine in an HEV in achieving reduced fuel consumption and lower NOx and PM emissions
Marwaha, Tejasva, Khedkar, Nikhil Dilip, Sarangi, Asish Kumar
Effect of Water Injection Parameters on Upper Load Limit and Nitrogen Oxides Emissions of a Homogeneous Charge Compression Ignition Engine—A Computational Fluid Dynamics Study03-18-01-000611/22/2024
Direct water injection inside the cylinder is a promising technique to enhance the upper load limit and reduce nitrogen oxides emissions. The advantage of water injection depends on the percentage of water evaporated inside the cylinder. The percentage of water evaporation depends upon the water injection parameters. Hence, a computational fluid dynamics analysis is done to determine the effect of water injection temperature, water spray cone angle, nozzle hole diameter, and number of nozzle holes on in-cylinder distribution and percentage of water evaporation, engine performance, and emissions of a homogeneous charge compression ignition engine. This analysis considers water injection temperature from 295 K to 385 K, water spray cone angle from 8° to 24°, nozzle hole diameter from 0.14 mm to 0.205 mm, and number of nozzle holes from 4 to 7. The computational fluid dynamics models used are validated from the available experimental data in the literature for the engine considered. Here
Naik, Bharat, Mallikarjuna, J. M.
Investigation of Combustion Stability in an RCCI Engine Using Recurrence Analysis of Cylinder Pressure Data2024-01-428711/5/2024
The Reactivity Control Compression Ignition (RCCI) engine, with its dual fuel system and coordinated injection strategy, offers superior emission control and fuel efficiency compared to conventional diesel engines. However, cyclic variations leading to engine combustion instability poses a significant challenge to their development and commercialization. In this study, statistical (COV and Histogram) and nonlinear dynamic (Recurrence Plot and its Quantification) analysis techniques are applied on the time-series data obtained from a single-cylinder diesel engine modified to operate in CNG-Diesel RCCI mode. The engine, while advancing the main injection timing (SOI-2), is tested under various operating conditions, including different engine loads, direct injection mass ratios (DIMR) and port fuel injection (PFI) masses, to help identify the configurations with better temporal correlations and deterministic traits. Such configurations hold potential for control strategy implementation
Prashar, Rajat, Kumar, Kamal S., Yadav, Ratnesh Kumar, Maurya, Rakesh Kumar
Effect of Premixing Ratio on the Deterministic Characteristics of Combustion Dynamics Butanol-Diesel RCCI Engine2024-01-429211/5/2024
The rising demand for vehicles has increased CO and HC emissions, worsening air quality and contributing to climate change, key issues under the clean development mechanism and UN SDG 13: Climate Action. Reactivity-Controlled Compression Ignition (RCCI) offers a promising solution to reduce PM and NOx while maintaining fuel efficiency. However, the cyclic variation of the RCCI engine remains an underexplored area in control strategies, necessitating further research for optimization in line with sustainable development goals. This study explores the impact of premixing ratios on RCCI engines fueled with butanol and the nature of cyclic variation to know the controllability. Tests were conducted on a single-cylinder diesel engine at 1500 rpm and constant engine load. The experiments reveal that increasing the premixing ratio from 45% to 60% decreases the heat release rate by 15%, Pmax by 10%, and IMEP by 12%. Recurrence Quantitative Analysis (RQA) confirmed strong deterministic
Yadav, Ratnesh Kumar, Mohite, Avadhoot Abaso, Maurya, Rakesh Kumar
Quantifying Environmental and Health Impacts of Conventional Diesel and Methane Diesel RCCI Engine Emissions: A Numerical Analysis2024-01-430711/5/2024
A reactivity-controlled compression ignition (RCCI) engine offers ultralow soot and nitrogen oxide (NOx) emission in addition to higher thermal efficiency than diesel or compression ignition (CI) engines. However, the higher emissions of unburned hydrocarbons (HC) and carbon monoxide (CO) from RCCI engines pose a significant challenge that hinders their adoption in the future automotive sector. Additionally, HC includes several hydrocarbons that harm human health and the environment. This study aims to minimize HC and CO formation and emissions by implementing different injection strategies, including adjustments to spray angle configuration, injection timing, and fuel premixing ratio. Additionally, the study examines how different injection strategies affect the spatial and temporal distribution of HC and CO inside the combustion chamber. To achieve this objective, a numerical investigation is conducted on a single-cylinder diesel engine modified to operate in RCCI mode, utilizing a
Yadav, Neeraj Kumar, Chandel, Amit Singh, Maurya, Rakesh Kumar, Padhee, Srikant Sekhar
Numerical Investigations on Reducing Unburned Hydrocarbon and Carbon Monoxide Emissions in Reactivity-Controlled Compression Ignition Using Partial Reactivity Stratification with Alternative Fuels and Additive03-18-01-000510/4/2024
A numerical investigation has been performed in the current work on reactivity-controlled compression ignition (RCCI), a low-temperature combustion (LTC) strategy that is beneficial for achieving lower oxides of nitrogen (NOx) and soot emission. A light-duty diesel engine was modified to run in RCCI mode. Experimental data were acquired using diesel as HRF (high-reactivity fuel) and gasoline as LRF (low reactivity fuel) to check the accuracy and fidelity of predicted results. Blends of ethanol and gasoline with DTBP (di-tert-butyl peroxide) addition in a small fraction on an energy basis were used in numerical simulations to promote ignitability and reactivity enhancement of PFI charge. Achieving stable, smooth, and gradual combustion in RCCI is challenging at low loads, especially in light-duty engines, due to misfiring and poor combustion stability. DTBP is known for enhancing cetane number and accelerating combustion, and it is mixed in a PFI blend to avoid combustion deterioration
Tripathi, Saurabh, Krishnasamy, Anand
Novel Chemical Kinetics Mechanism for Robust Simulation of Multi-Component Fuel Blends in Engine Conditions2024-24-00359/18/2024
Ammonia, with its significant hydrogen content, offers a practical alternative to pure hydrogen in marine applications and is easier to store due to its higher volumetric energy density. While Ammonia's resistance to auto-ignition makes it suitable for high-compression ratio engines using pre-mixed charge, its low flame speed poses challenges. Innovative combustion strategies, such as dual-fuel and reactivity-controlled compression ignition (RCCI), leverage secondary high-reactivity fuels like diesel to enhance Ammonia combustion. To address the challenges posed by Ammonia's low flame speed, blending with hydrogen or natural gas (NG) in the low reactivity portion of the fuel mixture is an effective approach. For combustion simulation in engines, it is crucial to develop a chemical kinetics mechanism that accommodates all participating fuels: diesel, Ammonia, hydrogen, and NG. This study aims to propose a kinetics mechanism applicable for the combustion of these fuels together. The
Salahi, Mohammad Mahdi, Mahmoudzadeh Andwari, Amin, Kakoee, Alireza, Hyvonen, Jari, Gharehghani, Ayat, Mikulski, Maciej, Lendormy, Éric
Auto-Ignited Combustion Control in an Engine Equipped with Multiple Boosting Devices03-17-06-00436/3/2024
The combustion timing of auto-ignited combustion is determined by composition, temperature, and pressure of cylinder charge. Thus, for a successful auto-ignition, those key variables must be controlled within tight target ranges, which is challenging due to (i) nature of coupling between those variables, and (ii) complexity of managing multiple actuators in the engine. In this article, a control strategy that manages multiple actuators of a boosted homogeneous charge compression ignition (HCCI) engine is developed to maintain robust auto-ignited combustion. The HCCI engine being considered is equipped with multiple boosting devices including a supercharger and a turbocharger in addition to conventional actuators and sensors. Since each boosting device has its own pros and cons, harmonizing those boosting devices is crucial for successful transient operation. To address the multi-variable transient control problem, speed-gradient control methodology is applied to minimize coupling
Kang, Jun-Mo
Dimethyl Ether Biogas Reactivity-Controlled Compression Ignition for Sustainable Power Generation with Low Nitrogen Oxide Emissions03-17-07-00544/22/2024
Biogas (60% methane–40% CO2 approximately) can be used in the reactivity-controlled compression ignition (RCCI) mode along with a high-reactivity fuel (HRF). In this work dimethyl ether (DME) that can also be produced from renewable sources was used as the HRF as a move toward sustainable power generation. The two-cylinder turbocharged diesel engine modified to work in the DME–biogas RCCI (DMB-RCCI) mode was studied under different proportions of methane (45–95%) in biogas since the quality of this fuel can vary depending on the feedstock and production method. Only a narrow range of biogas to DME ratios could be tolerated in this mode at each output without misfire or knock. Detailed experiments were conducted at brake mean effective pressures (BMEPs) of 3 and 5 bar at a speed of 1500 rpm and comparisons were made with the diesel–biogas dual-fuel and diesel–biogas RCCI modes under similar methane flow rates while the proportion of CO2 was varied. The DMB-RCCI mode exhibited superior
Gopa Kumar, S., Mohan, Aneesh, Ramesh, A.
Effect of Spark Assisted Compression Ignition on the End-Gas Autoignition with DME-air Mixtures in a Rapid Compression Machine2024-01-28224/9/2024
Substantial effort has been devoted to utilizing homogeneous charge compression ignition (HCCI) to improve thermal efficiency and reduce emission pollutants in internal combustion engines. However, the uncertainty of ignition timing and limited operational range restrict further adoption for the industry. Using the spark-assisted compression ignition (SACI) technique has the advantage of using a spark event to control the combustion process. This study employs a rapid compression machine to characterize the ignition and combustion process of Dimethyl ether (DME) under engine-like background temperature and pressures and combustion regimes, including HCCI, SACI, and knocking onsite. The spark ignition timing was swept to ignite the mixture under various thermodynamic conditions. This investigation demonstrates the presence of four distinct combustion regimes, including detonation, strong end-gas autoignition, mild end-gas autoignition, and HCCI. The observation indicates that HCCI
Jin, Long, Yu, Xiao, Wang, Meiping, Reader, Graham, Zheng, Ming
Investigation on Combustion Stability, Unregulated and Particle Emissions in RCCI Engine2024-01-20884/9/2024
This study experimentally investigates the combustion stability in RCCI engines along with the gaseous (regulated and unregulated) and particle emissions. Multifractal analysis is used to characterize the cyclic combustion variations in the combustion parameters (such as IMEP, CA50, and THR). This analysis aims to investigate the multifractal characteristics of the RCCI combustion mode near the misfiring limit. The investigation is carried out on a modified single-cylinder diesel engine to operate in RCCI combustion mode.The RCCI combustion mode is tested for different diesel injection timing (SOI) at fixed engine speed (1500rpm) and load (1.5 bar BMEP). The particle number characteristics and gaseous emissions are measured using a differential mobility spectrometer (DMS500) and Fourier Transform Infrared Spectroscopy (FTIR) along with Flame Ionizing Detector (FID), respectively. The results indicate that the NOx emissions decrease with advanced SOI while the Total Hydro-Carbon (THC
Yadav, Ratnesh Kumar, Saxena, Mohit Raj, Maurya, Rakesh Kumar
Strategies to Reduce Higher Unburned Hydrocarbon and Carbon Monoxide Emissions in Reactivity Controlled Compression Ignition2024-01-23604/9/2024
Reactivity Controlled Compression Ignition (RCCI) is a promising, high-efficiency, clean combustion mode for diesel engines. One of the significant limitations of RCCI is its higher unburned hydrocarbon (HC) and carbon monoxide (CO) emissions compared to conventional diesel combustion. After-treatment control of HC and CO emissions is difficult to achieve in RCCI because of lower exhaust gas temperatures associated with the low-temperature combustion (LTC) mode of operation. The present study involves combined experimental and computational fluid dynamic (CFD) investigations to develop the most effective HC and CO control strategy for RCCI. A production light-duty diesel engine is modified to run in RCCI mode by introducing electronic port fuel injection with the replacement of mechanical injectors by the CRDI system. Experimental data were obtained using diesel as HRF (High reactive fuel) and gasoline as LRF (low reactive fuel). The combustion simulation was performed using the
Tripathi, Saurabh, Krishnasamy, Anand
Machine Learning-Based Modeling and Predictive Control of Combustion Phasing and Load in a Dual-Fuel Low-Temperature Combustion Engine03-17-04-00301/18/2024
Reactivity-controlled compression ignition (RCCI) engine is an innovative dual-fuel strategy, which uses two fuels with different reactivity and physical properties to achieve low-temperature combustion, resulting in reduced emissions of oxides of nitrogen (NOx), particulate matter, and improved fuel efficiency at part-load engine operating conditions compared to conventional diesel engines. However, RCCI operation at high loads poses challenges due to the premixed nature of RCCI combustion. Furthermore, precise controls of indicated mean effective pressure (IMEP) and CA50 combustion phasing (crank angle corresponding to 50% of cumulative heat release) are crucial for drivability, fuel conversion efficiency, and combustion stability of an RCCI engine. Real-time manipulation of fuel injection timing and premix ratio (PR) can maintain optimal combustion conditions to track the desired load and combustion phasing while keeping maximum pressure rise rate (MPRR) within acceptable limits. In
Punasiya, Mohit, Sarangi, Asish Kumar
Environmental and Cancer Risk Potential Assessment of Unregulated Emissions from Methanol-Diesel Dual Fuel RCCI Engine2024-26-01521/16/2024
The influence of engine load and fuel premixing ratio (PMR) on unregulated emission from a methanol-diesel dual-fuel RCCI (MD-RCCI) engine is examined in this study. The study focuses on assessing the adverse effects of unregulated emissions (saturated HC, unsaturated HC, carbonyl compounds, aromatic hydrocarbon, NH3, and SO2) on the health of human beings and the environment. To quantify the effect on the environment, the greenhouse gas potential (GWPs), Eutrophication potential (EP), Acidification potential (AP), and Ozone forming potential (OFP) are calculated and presented. The cancer risk potential (CRP) of the carbonyl compounds (HCHO and CH3CHO) is calculated and presented to see the effect on human health. The results demonstrate that at lower engine load, with an increase in PMR, the OFP and CRP for MD-RCCI operation increase significantly, whereas AP, EP, and GWPs decrease. Additionally, with a rise in the load at a constant PMR, the AP, EP and OFP decrease significantly. The
Yadav, Neeraj Kumar, Saxena, Mohit Raj, Maurya, Rakesh Kumar
Experimental Study of Combustion Characteristics and Emissions of Pre-Chamber Induced HCCI Combustion2023-01-162310/31/2023
It is a well-known fact that HCCI combustion offers the possibility of achieving high efficiency with low emissions, but with the challenges in combustion control and ability to adjust to changing environmental conditions. To resolve the aforementioned challenges, a pre-chamber induced homogeneous charge compression ignition (PC-HCCI) combustion mode was experimentally tested with aim of providing initial operating boundaries in terms of combustion stability and obtaining initial performance results. The single cylinder engine equipped with active pre-chamber and compression ratio (CR) of 17.5 was fueled by gasoline. The initial experiments were performed at the engine speed of 1600 rpm with intake air temperatures varied from 33°C to 100°C to verify the possibility of achieving the PC-HCCI combustion mode and to compare the achieved engine performance and emission results with both PCSI and pure HCCI combustion modes used as reference cases. The results showed that PC-HCCI combustion
Ugrinić, Sara, Krajnovic, Josip, Sjeric, Momir, Kozarac, Darko
TOC99-05-05-0TOC10/24/2023
TOC
Tobolski, Sue
Operation Range Extension of Homogeneous Charge Compression Ignited Small-Bore Off-Road Diesel Engine Using Acetone-Gasoline Blends2023-01-180010/24/2023
The Homogeneous Charge Compression Ignition (HCCI) combustion eliminates the issues of higher particulate matter and nitrogen oxides emissions that prevail in the traditional compression ignition (CI) combustion mode. The complete replacement of traditional fuels with renewable fuels for internal combustion engines is challenging because significant infrastructure changes in the production and delivery systems are required to ensure renewable fuel availability and economic feasibility. Thus, the use of renewable acetone blended with traditional gasoline has been proposed in the present study to smoothen the transition from the traditional CI to the HCCI engines. HCCI experiments were performed in a light-duty diesel engine at 1500 rpm rated speed. By varying the volumetric proportion of the acetone in the gasoline from 20% to 40%, the HCCI engine load range from 20%-60% was achieved, significantly higher than the limited diesel HCCI load range of 20%-38%. An ignition-quality enhancer
Kale, Aneesh Vijay, Krishnasamy, Anand
Effects of Hydrocarbon with Different Ignition Properties and Hydrogen Blended Fuels on Autoignition and Combustion in an IC Engine2023-01-180210/24/2023
Hydrogen has attracted attention as one of the key fuels for making internal combustion engines carbon neutral. However, the combustion characteristics of hydrogen differ greatly from those of conventionally used hydrocarbons. Therefore, in order to develop next-generation internal combustion engines that operate on hydrogen, it is first necessary to have a thorough understanding of the combustion characteristics of hydrogen. Engines that can take maximum advantage of those characteristics should be developed on the basis of that knowledge. Toward that end, the purpose of this study was to investigate the fundamental combustion characteristics of hydrogen in a test engine. This paper presents the results of an investigation of the effects on low-temperature oxidation reactions and autoignition when hydrogen was blended into dimethyl ether (DME) [1, 2], a gaseous hydrocarbon fuel. Combustion experiments were conducted using a single-cylinder engine, and chemical kinetic simulations were
Kuwabara, Kenta, MANABE, YUSUKE, Mito, Shinji, YAMAGIWA, REO, Yamaguchi, Takahiro, Yoshihara, Shintaro, MIYAMOTO, Sekai, Iijima, Akira
Influence of Combustion Mode on Heat Loss Distribution in Gasoline Engines2023-32-00759/29/2023
As a technology to reduce the heat loss of engines, heat insulation coating to the surface of combustion chamber has been received a lot of attention. In order to maximize the thermal efficiency improvements by the technology, it is important to clarify the location where heat insulation coating can reduce heat loss more effectively, considering the impact on abnormal combustion etc. In this study, transient behavior of wall heat flux distribution on the piston was analyzed using 3D Computational Fluid Dynamics (CFD) for three combustion modes (spark ignition combustion (SI), homogenous charge compression Ignition (HCCI) and spark controlled compression ignition (SPCCI)).
Matsuda, Hirotsugu, Uchida, Kenji, Harada, Yuji, Yamashita, Hiroyuki
Prediction of the Spontaneous Ignition in a GCI Engine using an Extended Physical Model of the Ignition Delay2023-32-00199/29/2023
With the aim to further reduce and limit pollutant emissions and fuel consumption towards carbon neutrality, researchers and automotive manufacturers have been studying new combustion technologies, such as low temperature combustions, which provide an efficient combustion with low pollutant emissions. Despite innovative combustion techniques, such as Homogeneous charge compression ignition (HCCI) and Gasoline compression ignition (GCI), proved to reduce pollutant emissions and increase efficiency of internal combustion engines, their large-scale deployment has been limited by problems in combustion management and stability. In fact, the challenge related to these innovative combustion techniques consists in the development of new control strategies and new calibration methodologies, which allow to limit their combustion instability. By relying on the natural phenomenon of autoignition, researchers showed that, to optimize GCI combustion, it is necessary to adopt a multiple injections
Silvagni, Giacomo, Ravaglioli, Vittorio, Ponti, Fabrizio, Moro, Davide, Stola*, Federico, Cesare, Matteo De
Numerical Investigation of Multi-Stage HCCI Combustion with Small Chamber Inside Piston2023-32-00209/29/2023
Homogeneous charge compression ignition (HCCI) combustion is promising for not only high thermal efficiency but also reducing nitrogen oxides (NOx) and PM simultaneously. However, the operational range of the HCCI combustion is limited because of some issues, such as poor control of ignition timing and knocking by the excessive rate of pressure rise. In this study, a new combustion system based on the HCCI combustion process is proposed based on the authors' previous experimental work. This combustion system has a divided combustion chamber of two parts, one is small and the other is large. The most significant feature is the small chamber inside the piston. At first, combustion takes place in the small chamber, and then the burned gas is ejected into the large chamber to ignite the mixture in the large chamber. In this combustion system, the combustion in the large chamber takes the HCCI combustion process. 3D-CFD was conducted to predict HCCI combustion characteristics with small
Nomura, Takuya, Moriyoshi, Yasuo, Morikawa, Koji, Kuboyama, Tatsuya
A Study of Autoignition and Combustion Characteristics in an HCCI Engine using a Blended Fuel of DME and City Gas2023-32-00179/29/2023
In recent years, there has been a need to reduce CO2 emissions from internal combustion engines in order to achieve an energy-saving and low-carbon society. Against this backdrop, the authors have focused attention on Homogeneous Charge Compression Ignition (HCCI) combustion that achieves both high efficiency and clean emissions. With HCCI combustion, a premixed mixture of fuel and air is supplied to the cylinder and autoignited by piston compression to drive the engine. Autoignition makes it possible to operate the engine at a high compression ratio, enabling the HCCI combustion system to attain high efficiency. However, HCCI combustion also has some major unresolved issues. Two principal issues that can be cited are ignition timing control for igniting the mixture at the proper time and assurance of suitable combustion conditions following ignition to prevent incomplete combustion and knocking. The combustion characteristics of a blended fuel of dimethyl ether (DME) as the ignition
Yamagiwa, Reo, MANABE, Yusuke, MITO, Shinji, IIJIMA, Akira, YOSHIHARA, Shintaro, YAMAGUCHI, Takahiro, MIYAMOTO, Sekai
Residual Gas Fraction Measurement and Estimation of the CFR Octane Rating Engine Operating Under HCCI Conditions2023-32-00109/29/2023
The autoignition chemistry of fuels depends on the pressure, temperature, and time history that the fuel-air mixture experiences during the compression stroke. While piezoelectric pressure transducers offer excellent means of pressure measurement, temperature measurements are not commonly available and must be estimated. Even if the pressure and temperature at the intake and exhaust ports are measured, the residual gas fraction (RGF) within the combustion chamber requires estimation and greatly impacts the temperature of the fresh charge at intake valve closing. This work replaced the standard D1 Detonation Pickup of a CFR engine with a rapid sampling valve to allow for in-cylinder gas sampling at defined crank-angle times during the compression stroke. The extracted cylinder contents were captured in an emissions sample bag and its composition was subsequently analyzed in an AVL i60 emissions bench. Carbon dioxide levels beyond atmospheric concentration directly identified the
Gonzalez, Jorge Pulpeiro, Hoth, Alexander, Kolodziej, Christopher P., Seong, Hee Je
Charge Dilution Strategy to Extend the Stable Combustion Regime of a Homogenous Charge Compression Ignited Engine Operated With Biodiesel2023-32-01329/29/2023
The present research explores the application of biodiesel fuel in a stationary agricultural engine operated under the Homogenous charge compression ignition (HCCI) mode. To achieve HCCI combustion, a fuel vaporizer and a high-pressure port fuel injection system are employed to facilitate rapid evaporation of the biodiesel fuel. The low volatility of biodiesel is one of the significant shortcomings, which makes it inevitable to use a fuel vaporizer at 380oC. Consequently, the charge temperature is high enough to promote advanced auto-ignition. Further, the high reactivity of biodiesel favors early auto-ignition of the charge. Besides, biodiesel exhibits a faster burn rate due to its oxygenated nature. The combined effect of advanced auto-ignition and faster burn rate resulted in a steep rise in the in-cylinder pressures, leading to abnormal combustion above 20% load. Diluting the charge reduces reactivity and intake oxygen concentration, facilitating load extension. This study explores
Bukkarapu, Kiran Raj, Krishnasamy, Anand
Influence of Reforming by Non-Equilibrium Plasma on Spontaneous Ignition of n-Heptane/Ethanol/N2/02 Mixture2023-32-01489/29/2023
The influence of ethanol volume fraction on the spontaneous ignition of homogeneous premixed gas reformed by non-equilibrium plasma was investigated. The HCCI experiments of the gas was carried out using a Rapid Compression Machine (RCM). The spontaneous ignition process and reforming process were numerically investigated by reaction simulation in OD. A simplified model was proposed to explain the influence of the reforming of the gas with different ethanol volume fractions, and the model was validated. These results indicate that the influence of the reforming on ignition delay of cool flame is almost irrespective of the ethanol volume fractions.
Otani, Masaki, Takagi, Keigo, Gomi, Koichi, Sakurai, Eita, Sasaki, Yusuke, Saito, Masanori, Tanabe, Mitusuaki
Insights into combustion and performance of HCCI engine fed with PODE 1 and H 2 -rich PODE 1 -reformate2023-32-00049/29/2023
A transition to sustainable energy sources, carbon- free/neutral energy carriers and efficient combustion technologies is intensively discussed as a key pathway in achieving a greener, more secure energy future. In particular, enhancement of internal combustion engine (ICE) performance using promising alternative carbon- neutral propellants, waste heat recovery (WHR) and state-of-the-art combustion methods has gained high research attention. Polyoxymethylene dimethyl ethers (PODEn, OMEn), well-suited for compression-ignition (CI) combustion, arouse strong interest as potentially sustainable and cleaner alternatives to diesel fuel. This study reports for the first-time numerically examined combustion performance characteristics of reforming- controlled compression ignition (RefCCI) ICE engine, managed by mixing of polyoxymethylene dimethyl ether 1 (PODE1) and its hydrogen-rich reforming products (PODE1-reformate) obtained through thermo- chemical recuperation. The results showed that
Buntin, Denis, Tartakovsky, Leonid
Variable Compression Ratio Hydrogen-Fueled Homogeneous Charge Compression Ignition Engine2023-24-00678/28/2023
Hydrogen-fueled homogeneous charge compression ignition (HCCI) engines have shown the ability to provide a cleaner and more efficient alternative to conventional fossil fuels. The use of hydrogen as a fuel has the potential to reduce greenhouse gas and promote sustainability. In this study, a modified single-cylinder Cooperative Fuel Research (CFR) engine was utilised to operate on hydrogen in a HCCI combustion mode under various compression ratio (CR) conditions. In the experiments, the amount of hydrogen injected was adjusted at each CR to maintain the crank angle at 50% mass fraction burned (CA50) combustion phasing at 3±1 crank angle degrees after top dead center or as lean as possible. The engine speed was fixed at 600 rpm, and the impact of different intake air temperatures was also investigated. The results indicated that as the compression ratio increases, the air-fuel ratio needs to be increased to maintain the desired CA50 value, i.e., the engine needs to operate leaner. The
Nguyen, Ducduy, Fernandes, Renston, Turner, James W.G.
Numerical Investigation of Ammonia-Diesel Fuelled Engine Operated in RCCI Mode2023-24-00578/28/2023
Ammonia, which is one of the most produced inorganic chemicals worldwide, has gained significant attention in recent years as a carbon-free fuel due to its significant energy density in maritime and power plant applications. This fuel offers several advantages including low production costs and being safe for storage and transport. Reactivity controlled compression ignition (RCCI) combustion mode is considered as a promising strategy reducing the level of nitrogen oxides (NOx) emissions and particulate matters (PM) in internal combustion engines (ICEs) due to the lower combustion temperatures and charge homogeneity. Ammonia-based RCCI combustion strategy can offer a simultaneous reduction of CO2 and NOx. In this study, a RCCI engine fuelled by ammonia and diesel is numerically simulated considering chemical reactions kinetics mechanism of the combustion. After validating the simulation results with literature experimental data, the effect of engine operational parameters such as the
Fakhari, Amir Hossein, Gharehghani, Ayat, Salahi, Mohammad Mahdi, Mahmoudzadeh Andwari, Amin, Mikulski, Maciej, Hunicz, Jacek, Könnö, Juho
Experimental Investigation on the Combustion of Biogas Containing Hydrogen in a HCCI Engine2023-24-00568/28/2023
Biogas is a gas resulting from biomass, with a volumetric content of methane (CH4) usually ranging between 50% and 70%, and carbon dioxide (CO2) content between 30% and 50%; it can also contain hydrogen (H2) depending on the feedstock. Biogas is generally used to generate electricity or produce heat in cogeneration system. Due to its good efficiency through the rapid combustion and lean air-fuel mixture, Homogeneous Charge Compression Ignition (HCCI) engine is a good candidate for such application. However, the engine load must be kept low to contain the high-pressure gradients caused by the simultaneous premixed combustion of the entire in-cylinder charge. The homogenous charge promotes low particulate emissions, and the dilution helps in containing maximum in-cylinder temperature, hence reducing nitrogen oxide emissions. However, HC and CO levels are in general higher than in SI combustion. Moreover, HCCI engines usually require high intake temperature with values depending on
Mariani, Antonio, Brequigny, Pierre, Masurier, Jean-Baptiste, Unich, Andrea, Minale, Mario, Foucher, Fabrice
Impact of Splitting n-Dodecane Pilot Injection on Ammonia RCCI Engine2023-24-00768/28/2023
The increased interest in ammonia as a hydrogen carrier and a carbon-free fuel for combustion applications continues to present several challenges to address. Moreover, the high auto-ignition temperature (925 K) for ammonia limits its use in compression ignition engines because excessively high compression ratio are required. One way to retrofit diesel engine is to help the ignition by injecting a pilot injection of reactive fuel, like diesel or biodiesel. In this study, the ammonia engine ignited by a dodecane pilot injection is investigated with a maximum ammonia energy share (until 98.5%). The effect of split diesel injection strategy in two-steps under medium load operating conditions is studied as a function of ammonia/air equivalence ratio. Splitting this injection reduces NOX, CO, UHC and unburnt NH3 emissions at the exhaust, even it remains above the recommended emissions limit, especially at stoichiometric or slightly rich ammonia/air mixture. Not evident tendencies can be
Rousselle, Christine Mounaim, Brequigny, Pierre, Dupuy, Anthony
Experimental Investigation of Cycle-to-Cycle Variations in Homogeneous Charge Compression Ignition Engine Fueled with Methanol Using Wavelets2023-01-02784/11/2023
The development of automotive engines continues to be determined by gradually more stringent emission norms including CO2 emissions and fuel consumption. To fulfill the simultaneous emission requirements for near-zero pollutants and low CO2 levels, several research studies are currently being carried out around the world on new engine combustion process, such as Homogeneous Charge Compression Ignition (HCCI). In HCCI engines, combustion rate, and ignition timing are dominated by physical and chemical properties of fuel/air/residual gas mixtures, boundary conditions including ambient temperature, pressure, and humidity, and engine operating conditions such as load, speed, etc. Higher cycle-to-cycle variations are observed in HCCI combustion engines due to the large variability of these factors. The cyclic variations in the HCCI engine are investigated on a modified four-stroke, four-cylinder engine. The HCCI combustion mode is tested with methanol fuel. This study presents the cyclic
Yadav, Ratnesh Kumar, Saxena, Mohit Raj, Maurya, Rakesh Kumar
Numerical Simulations of Pre-Chamber Induced HCCI Combustion (PC-HCCI)2023-01-02744/11/2023
Advanced combustion concepts that rely on the lean-burn approach are a proven solution for increasing the efficiency and reducing the harmful emissions of SI engines. The pre-chamber spark ignited (PCSI) engines utilize high ignition energy of the multiple jets penetrating from the pre-chamber, to enable fast and stable combustion of lean mixture in the main chamber. The combustion is still governed by the flame propagation, so the dilution level and efficiency benefits are highly restricted by strong decrease of laminar flame speeds. Homogeneous charge compression ignition (HCCI) combustion allows a higher dilution level due to rapid chemically driven combustion, however the inability to directly control the ignition timing has proven to be a major setback in HCCI deployment. The addition of the spark plug, to improve the controllability and widen the operating range, resulted in a combustion concept known as spark-assisted compression ignition (SACI), however spark ignition of lean
Krajnovic, Josip, Dilber, Viktor, Tomic, Rudolf, Sjeric, Momir, Ilincic, Petar, Kozarac, Darko
Computational Investigation of Combustion Phasing and Emission of Ammonia and Hydrogen Blends under HCCI Conditions2023-01-01894/11/2023
There is a growing interest in ammonia as a potential carbon-free fuel due to the current trend of decarbonization in ground transportation. Benefits of ammonia as a fuel include its high volumetric energy density, ease of storage and transportation, and mature manufacturing infrastructure. On the other hand, ammonia suffers from a low flame speed, long ignition delay times and NOx formation. In this work, a computational investigation of ammonia and hydrogen blends in a 0-D homogeneous charge compression ignition reactor is conducted using different blends under a range of engine-relevant conditions. Iso-contours of the crank angle corresponding to 50% of total heat release (CA50) are developed to assess the reactivity of the different blends under different engine speeds and equivalence ratios. The results show that ammonia requires a high inlet temperature to achieve a CA50 close to top dead center (TDC). An increase in hydrogen concentration resulted in a lower inlet temperature
Bakir, Ahmad, Ge, Haiwen, Zhao, Peng
Comparison of Combustion Parameters and Homogeneity of Full and Direct Injection Homogeneous Charge Compression Ignition Engine under Supercharger Conditions04-16-02-00101/9/2023
In this study, a numerical model validation of the supercharged homogeneous charge compression ignition (HCCI) engine, whose experimental studies at 100, 110, 120, 130, 140, 150, and 160 kPa pressures, was carried out using Converge CFD program. After validation, the in-cylinder pressure, heat release rate (HRR), and maximum pressure rise rate (PRRmax) of a fully HCCI engine and an early direct injection HCCI engine were compared numerically at different supercharger pressures. According to the comparison results, it was observed that the cylinder pressure increased and the maximum in-cylinder pressure point advanced with the increase of the supercharge pressure in the fully homogeneous and early direct injection mode. In the early direct injection system, it was observed that the maximum pressure was lower than the results obtained in fully homogeneous conditions, especially at high manifold absolute pressure (MAP) values. In both modes, it was determined that with increasing
Polat, Seyfi, Bulut, Ahmet, Akbulut, Furkan, Eroğlu, Tuba Neslihan
Control-Oriented Data-Driven and Physics-Based Modeling of Maximum Pressure Rise Rate in Reactivity Controlled Compression Ignition Engines03-16-06-004012/8/2022
Reactivity controlled compression ignition (RCCI) is a viable low-temperature combustion (LTC) regime that can provide high indicated thermal efficiency and very low nitrogen oxides (NOx) and particulate matter (PM) emissions compared to the traditional diesel compression ignition (CI) mode [1]. The burn duration in RCCI engines is generally shorter compared to the burn duration for CI and spark-ignition (SI) combustion modes [2, 3]. This leads to a high pressure rise rate (PRR) and limits their operational range. It is important to predict the maximum pressure rise rate (MPRR) in RCCI engines and avoid excessive MPRRs to enable safe RCCI operation over a wide range of engine conditions. In this article, two control-oriented models are presented to predict the MPRR in an RCCI engine. The first approach includes a combined physical and empirical model that uses the first principle of thermodynamics to estimate the PRR inside the cylinder, and the second approach estimates MPRR through a
Irdmousa, Behrouz Khoshbakht, Basina, L. N. Aditya, Naber, Jeffrey, Mohammadpour Velni, Javad, Borhan, Hoseinali, Shahbakhti, Mahdi
Letter from the Special Issue Editors04-16-01-000112/7/2022
Letter from the Special Issue Editors
Solmaz, Hamit, Polat, Seyfi
Letter from the Special Issue Editors04-16-02-000712/7/2022
Letter from the Special Issue Editors
Solmaz, Hamit, Polat, Seyfi
Effectiveness of Exhaust Gas Recirculation on Low-Load Combustion Efficiency of a Reactivity Controlled Compression Ignition Engine04-16-02-000811/18/2022
Reactivity controlled compression ignition (RCCI) is a potential low-temperature combustion (LTC) technique for running intrinsically efficient compression ignition engines while reducing the oxides of nitrogen (NOx) and particulate matter (PM) emissions. However, poor low-load combustion efficiency is a major challenge in the RCCI strategy. In this work, a combination of injection strategy and cold and hot exhaust gas recirculation (EGR) strategies were investigated to improve the low-load combustion efficiency of a production light-duty compression ignition engine operating in the gasoline-diesel dual-fuel RCCI mode. The engine was operated at a low load of 3 bar gross indicated mean effective pressure and at an engine speed of 1500 rpm with wide ranges of single and multiple fuel injection strategies. Significant improvement in combustion efficiency was achieved by targeting the directly injected diesel fuel in the piston lip region. Multiple fuel injection strategy in which more
Khedkar, Nikhil Dilip, Sarangi, Asish K.
Closed-Loop Predictive Control of a Multi-mode Engine Including Homogeneous Charge Compression Ignition, Partially Premixed Charge Compression Ignition, and Reactivity Controlled Compression Ignition Modes04-16-01-000310/20/2022
High thermal efficiency and low engine-out emissions including nitrogen oxides (NOx) and particulate matter (PM) make low-temperature combustion (LTC) favorable for use in engine technologies. Homogeneous charge compression ignition (HCCI), partially premixed charge compression ignition (PPCI), and reactivity controlled compression ignition (RCCI) are among the common LTC modes. These three LTC modes can be achieved on the same dual-fuel engine platform; thus, an engine controller can choose the best LTC mode for each target engine load and speed. To this end, a multi-mode engine controller is needed to adjust the engine control variables for each LTC mode. This article presents a model-based control development of a 2.0-liter multi-mode LTC engine for cycle-to-cycle combustion control. The engine is equipped with port fuel injectors (PFI) and direct injectors (DI). All combustion modes are achieved with dual fuels (iso-octane and n-heptane) under naturally aspirated conditions. Using
Batool, Sadaf, Naber, Jeffrey, Shahbakhti, Mahdi
A Neural Network Approach for Reconstructing In-cylinder Pressure from Engine Vibration Data132489/19/2022
In this work neural network models are used to reconstruct in-cylinder pressure from a vibration signal measured from the engine surface by a low-cost accelerometer. Using accelerometers to capture engine combustion is a cost-effective approach due to their low price and flexibility. The paper describes a virtual sensor that re-constructs the in-cylinder pressure and some of its key parameters by using the engine vibration data as input. The vibration and cylinder pressure data have been processed before the neural network model training. Additionally, the correlation between the vibration and in-cylinder pressure data is analyzed to show that the vibration signal is a good input to model the cylinder pressure.The approach is validated on a RON95 single cylinder research engine realizing homogeneous charge compression ignition (HCCI). The experimental matrix covers multiple load/rpm steady-state operating points with different start of injection and lambda setpoints. A radial basis
Khac, Hoang
A Quasi-Dimensional Burn Rate Model for Spark-Assisted Compression Ignition (SACI) Combustion2022-24-00399/16/2022
Future combustion engine applications require highest possible energy conversion efficiencies to reduce their environmental impact and be economically competitive. So far, spark-ignition (SI) engine combustion development mostly consisted of optimizing the hemispherical flame propagation combustion method. Thereby, a significant efficiency increase is only achievable in combination with high excess air dilution or increased combustion speed. However, with increasing excess air dilution, this is difficult due to decreasing flame speeds and flammability limits. Simultaneously, researchers have been investigating homogeneous charge compression ignition (HCCI) that achieves higher efficiencies due to its rapid volume reaction combustion and also enables high excess air dilution. However, the combustion is complex to control as it is initiated by auto-ignition (AI) processes. In-cylinder conditions reliably need to be reproduced to prevent damaging pre-ignitions. Consequently, HCCI has only
Salerno, Francesco, Bargende, Michael, Kulzer, André Casal, Grill, Michael
Assessment of the Combustion Process in Ultra-Lean (λ>1.8) Natural Gas Engines2022-01-10618/30/2022
The majority of today’s natural gas fired engines are applying a premixed combustion concept, which is commonly assumed to be based on the turbulence-enhanced propagation of a thin flame separating the burnt and unburnt fractions of the mixture volume. This concept has been confirmed by means of comprehensive experimental investigations on passenger car engines operating at air/fuel ratios close to stoichiometry; however, for larger industrial engines (4-stroke and 2-stroke) designed for ultra-lean (λ >1.8) operation in order to achieve highest efficiencies, this assumption is no longer valid, as will be shown in the following. On these engines, the combustion process is largely controlled by the reaction kinetics of the chemistry and hence exhibits more similarity to homogeneous charge or spark assisted compression ignition (HCCI or SACI) combustion concepts. This is substantiated by a detailed review on theoretical and experimental investigations of ultra-lean combustion processes, a
Unfug, Fridolin, Weisser, German Andreas
Crank Angle Based Exergy Analysis of Syngas Fuelled Homogeneous Charge Compression Ignition Engine2022-01-10378/30/2022
Homogeneous charged compression ignition (HCCI) engine is a low-temperature combustion (LTC) strategy with higher thermal efficiency and ultra-low NOx and particulate matter emission. Syngas is a renewable and clean alternative fuel that has gained researchers' interest, and it is one of the alternatives to fossil fuels. Syngas can be a suitable fuel for HCCI Engines due to their characteristics of high flame speed, lower flammability limits, and low auto-ignition temperatures. This paper presents the crank angle-based exergy analysis of syngas fuelled HCCI engines. Energy and exergy analysis is essential for the better performance and utilization of the HCCI engine. The syngas HCCI engine is numerically simulated in this study using a stochastic reactor model (SRM). In SRM models, physical parameters are described by a probability density function (PDF), and these parameters do not vary within the combustion chamber. Thus, the spatial distribution (due to local inhomogeneity) of the
Saxena, Mohit Raj, Ranjane, Vishwajeet, Maurya, Rakesh Kumar
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