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Numerical Modeling of Spray Formation under Flash-boiling Conditions

ANSYS Inc-Mingyuan Tao, Long Liang, Yue Wang, Ellen Meeks
  • Technical Paper
  • 2020-01-0328
To be published on 2020-04-14 by SAE International in United States
Flash boiling occurs in sprays when the ambient gas pressure is lower than the saturation pressure of the injected fuel. In the present work, a numerical study was conducted to investigate solid-cone spray behaviors under various flash-boiling conditions. A new spray cone angle correlation that is a function of injection parameters was developed and used for spray initialization at the nozzle exit to capture plume interactions and the global spray shape. The spray-breakup regime control was adjusted to enable catastrophic droplet breakup, characterized by Rayleigh-Taylor (RT) breakup, near the nozzle exit. The model was validated against experimental spray data from five different injectors, including both multi-hole and single-hole injectors, with injection pressure varying from 100 to 200 bar. Different fuels, including iso-octane, n-heptane, n-pentane, ethanol, and n-butanol, were investigated under a wide range of flash-boiling conditions, in which flash boiling was induced by high injected fuel temperature, ranging from 323 to 493 K, and/or low ambient gas pressure, ranging from 0.1 bar to atmospheric. It is found that flash boiling can significantly increase the spray…
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High-pressure laminar burning velocity measurements of ethanol- a Co-Optima fuel candidate

Public Authority for Applied Education & Training-Bader Almansour
University of Central Florida-Gihun Kim, Anthony Terracciano, Subith Vasu
  • Technical Paper
  • 2020-01-0332
To be published on 2020-04-14 by SAE International in United States
Co-Optimization of Fuels and Engines initiative (Co-Optima) of the U.S Department of Energy initiated investigations on several candidates of biofuels and blends for internal combustion engines. Several biofuels were selected by screening criteria, which were boiling point, toxicity, research octane number, octane sensitivity, laminar flame speed, and economical distribution system, etc. In this study, we focused our investigation on ethanol – a key fuel candidate. Measurements of properties such as ignition delay time and laminar burning velocity (LBV) are necessary for these fuels in order to understand their performance and applicability in engines. One key combustion metric is the fuel’s LBV in air over a range of equivalence ratios. LBV is dependent on reactive mixture composition, temperature, and pressure, but it is independent of hydrodynamic conditions, such as stretch rate, turbulent intensity, and Reynolds number. LBV is useful as it: (i) gives a measure of combustion efficiency and heat release rate; (ii) enables validation of chemical kinetic mechanisms; (iii) and gives engine design engineers a metric for the expected time required to burn the fuel…
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Development of Dual Fuel Engine Fuelled with Used Cooking Oil Biodiesel and Ethanol-an Experimental Study on performance and combustion characteristics

Hindustan Institute of Technology & Science-Ramanathan Velmurugan, Jaikumar Mayakrishnan, Vijayabalan Palanimuthu, Sasikumar Nandagopal, Sangeethkumar Elumalai, Shridhar Anaimuthu, Vamshidhar Busireddy
  • Technical Paper
  • 2020-01-0803
To be published on 2020-04-14 by SAE International in United States
This paper is to investigate the performance and combustion characteristics of compression ignition engine fuelled with ethanol enhanced used cooking oil biodiesel. In this study, used cooking oil biodiesel was injected through a regular fuel injection system and ethanol of various flow rates was inducted through the intake manifold to improve the air-fuel homogeneity in the cylinder. This injection flow rate was metered by an electronic control unit. The engine test was conducted in different load conditions from no load to full load in a fully instrumented direct injection water-cooled compression ignition engine. The results indicated that the engine produced higher brake thermal efficiency, exhaust gas temperature, carbon dioxide emissions, cylinder peak pressure, peak heat release rate, ignition delay and lower combustion duration at higher rated power condition. However, the combustion characteristics of ethanol enhanced used cooking oil biodiesel was found marginal decrease at low rated power conditions in comparison to that of diesel.
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Instantaneous PLII and OH* Chemiluminescence Study on Wide Distillation Fuels, PODEn and Ethanol Blends in a Constant Volume Vessel

Birmingham University-Hongming Xu
CNPC Ji Chai Power Co., Ltd.-Dong Liu
  • Technical Paper
  • 2020-01-0340
To be published on 2020-04-14 by SAE International in United States
The combustion characteristics and soot emissions of three types of fuels were studied in a high pressure and temperature vessel. In order to achieve better volatility, proper cetane number and high oxygen content, the newly designed WDEP fuel was proposed and investigated. It is composed of wide distillation fuel (WD), PODE3-6 mixture (PODEn) and ethanol. For comparison, the test on WD and the mixture of PODEn-ethanol (EP) are also conducted. OH* chemiluminescence during the combustion was measured and instantaneous PLII was also applied to reveal the soot distribution. Abel transformation was adopted to calculate the total soot of axisymmetric flame. The results show that WDEP has similar ignition delays and flame lift-off lengths to those of WD at 870-920 K. But the initial ignition locations of WDEP flame in different cycles were more concentrated, particularly under the condition of low oxygen atmosphere. Comparing with WD, the soot amount of WDEP decreased for 55% and 27% at 870 K and 920 K. For the case of 920 K and 15.8% of ambient oxygen, the soot amount…
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Effect of changing compression ratio on ignition delay times of iso-octane in a rapid compression machine

Michigan State University-Chaitanya Wadkar, Prasanna Chinnathambi, Elisa Toulson
  • Technical Paper
  • 2020-01-0338
To be published on 2020-04-14 by SAE International in United States
Previous studies have shown that several facility dependent factors can influence ignition delay times measured in a rapid compression machine. Compression ratio variation can have a major impact on measured delay times due to the change in surface-area-to-volume ratio even when the same compressed conditions are maintained. In this study, iso-octane, which exhibits two stage ignition delay and has a pronounced negative temperature coefficient (NTC) region, is used to investigate the effects of several facility dependent factors on ignition delay. Resulting trends are also compared to previous results obtained with ethanol, which has very different combustion properties. In addition to the experimental results, numerical analysis is also used to gain a deeper understanding of the complex processes occurring inside the combustion chamber at a variety of different compression ratio conditions. Experiments and simulations were carried out for stoichiometric mixtures of iso-octane and air over a compressed temperature range of 700–900 K at 20 bar compressed pressure. The compression ratio was varied from 9.58 to 17.07 which also led to changes in initial conditions, compression time…
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Simulation of SACI Autoignition Phasing Sensitivity for Production Controls Strategies

Clemson University-Dennis Robertson, Robert Prucka
  • Technical Paper
  • 2020-01-1145
To be published on 2020-04-14 by SAE International in United States
Spark-assisted compression ignition (SACI) is a combustion strategy that leverages flame propagation to trigger autoignition. The autoignition event is highly sensitive to several parameters, and thus, achieving SACI in production demands a robust response to variations in conditions. However, limited research is available to quantify the combustion response of SACI to these variations. A simulation study is performed to identify the sensitivity in autoignition timing as ethanol content, fuel RON, air-fuel ratio, EGR level, and the phasing of flame propagation are swept. An experimentally-validated one-dimensional simulation model provides the composition, state, and flow metrics at BDC. The results are applied to the Leeds diagram to ensure the conditions are viable for flame propagation. The conditions at BDC are then transferred to a chemical kinetics solver, where autoignition is modeled using a detailed chemical kinetics mechanism. These results are used to explore the SACI combustion controls space. The range of CA50 control authority is particularly important as combustion phasing is used to perform rapid torque changes. The steady-state combustion control authority is evaluated, and potential controls…
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The Effects of Thick Thermal Barrier Coatings on Low-Temperature Combustion

Clemson University-Ziming Yan, Brian Gainey, Benjamin Lawler
Stony Brook University-James Gohn, Deivanayagam Hariharan, John Saputo, Carl Schmidt, Felipe Caliari, Sanjay Sampath
  • Technical Paper
  • 2020-01-0275
To be published on 2020-04-14 by SAE International in United States
An experimental study was conducted on a Ricardo Hydra single-cylinder light-duty diesel research engine. Start of Injection (SOI) timing sweeps from -350 deg aTDC to -210 deg aTDC were performed on a total number of five pistons including two baseline metal pistons and three coated pistons to investigate the effects of thick thermal barrier coatings (TBCs) on the efficiency and emissions of low-temperature combustion (LTC). A fuel with a high latent heat of vaporization, wet ethanol, was chosen to eliminate the undesired effects of thick TBCs on volumetric efficiency. Additionally, the higher surface temperatures of the TBCs can be used to help vaporize the high heat of vaporization fuel and avoid excessive wall wetting. A specialized injector with a 60° included angle was used to target the fuel spray at the surface of the coated piston. Throughout the experiments, the equivalence ratio, ϕ, was maintained constant at 0.4; the combustion phasing was consistently matched at 6.8 ± 0.4 deg aTDC. It can be concluded that the thick TBC cases achieved 1 to 2 percentage points…
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Effective Utilization of Low Carbon Fuels in Agricultural Engines Using Low Cost Electronic Primary Fuel Injection Unit

Hindustan Institute of Technology & Science-Sasikumar Nandagopal, Shridhar Anaimuthu, Jaikumar Mayakrishnan, Selvakumar Raja, Vamshidhar Busireddy, Madhu Kovuru
  • Technical Paper
  • 2020-01-1369
To be published on 2020-04-14 by SAE International in United States
Reliability and cost effectiveness of electronics demand its usage in all the wings of science and technology. Thus an attempt was made in this work to investigate the potential of using electronics for injecting primary fuel for the compression ignition engine used by farmers for agricultural purpose. In the first phase of the work, new Electronic Control Unit (ECU) for primary fuel injection was developed and tested for its repeatability on fuel injection quantity for the different input voltages. Test engine was developed and tested under various load condition for its performance, emission, and combustion characteristics with neat diesel and Waste Cooking Oil Methyl Esters (WCOME) as baseline readings in the second phase of the work. In the third phase of the work, developed engine was modified to operate in duel fuel mode with developed ECU. In this work, ethanol was chosen as primary fuel due to its availability and less toxic nature as compared to other green fuels. Pilot fuel (i.e. WCOME) was injected using mechanical fuel injection system. Results inferred that the brake…
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Onboard Ethanol-Gasoline Separation System for Octane-on-Demand Vehicle

Honda R&D Co., Ltd.-Hiroshi Chishima, Daiko Tsutsumi, Toru Kitamura
  • Technical Paper
  • 2020-01-0350
To be published on 2020-04-14 by SAE International in United States
Bio-ethanol is being used worldwide as an alternative fuel because of CO2 emission reduction and energy sustainability. It is common knowledge that ethanol has an advantage of high anti-knock quality. It is also well known that enhancement of both fuel economy and high load performance for general gasoline engines are limited by knocking. In order to increase anti-knock performance, a fuel system was developed to separate ethanol blended gasoline fuel into high-octane number fuel (high-concentration ethanol fuel) and low-octane number fuel (low-concentration ethanol fuel) on a vehicle. The onboard fuel separation system, installed in the fuel tank, mainly consists of a pervaporation membrane module, a fuel supply pump for the membrane, heat exchangers for fuel heating, a condenser for the permeated fuel vapor and a vacuum pump to control the pressure on the permeation side. Vapor that was not condensed at the condenser is supplied to the engine through a canister purge line. In this study, it was revealed that the onboard fuel separation system has controllability sufficient for use in automobiles by evaluating the…
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Effect of Hydrous Ethanol Combined with EGR on Performance of GDI Engine

Tongji University-Yifei Duan, Xiuyong Shi, Yang Kang, Yansu Liao, Lishuang Duan
  • Technical Paper
  • 2020-01-0348
To be published on 2020-04-14 by SAE International in United States
In recent years, particulate matters (PM) emissions from gasoline direct injection (GDI) engines have been gradually paid attention to, and the hydrous ethanol has a high oxygen content and a fast burning rate, which can effectively improve the combustion environment. In addition, Exhaust gas recirculation (EGR) can effectively reduce engine NOx emissions, and combining EGR technology with GDI engines is becoming a new research direction. In this study, the effects of hydrous ethanol gasoline blends on the combustion and emission characteristics of GDI engines are analyzed through bench test. The results show that the increase of the proportion of hydrous ethanol can accelerate the burning rate, shorten the combustion duration by 7°crank angle (CA), advance the peak moment of in-cylinder pressure and rate of heat release (RoHR) and improve the combustion efficiency. The hydrous ethanol gasoline blends can effectively improve the gaseous and PM emissions of the GDI engine. Among them, the concentrations of carbon monoxide (CO) and hydrocarbon (HC) decrease by 10.6% and 12.2%, the concentration of PM drops by three orders of magnitude,…