Your Selections

HCCI engines
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Events

Magazine

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Sensitivity Analysis of the Combustion Parameters in a Stratified HCCI Engine with Regard to Performance and Emission

Mazandaran University of Science and Tech-Mohsen Pourfallah, Mahboud Armin
Published 2019-09-09 by SAE International in United States
Homogeneous charge compression ignition (HCCI) is a promised solution to environmental and fuel economy concerns for IC engines. Engine application for HCCI engine depends on an array of parameters such as fuel type, mixture composition, intake condition and engine specification, meaning that controlling an HCCI engine can only be done through the adjustment of these parameters. In this numerical study which is driven from an experimental work, thermal and charge stratification is used to control HCCI combustion. The effect of intake temperature, compression ratio, intake pressure, EGR, reformer gas (CO-H2 mixture) and glow plug temperature on engine performance and emission was investigated using a 3D model on AVL-FIRE parallel with 1D model on GT-Power software. Then AHP model as a Multiple Attribute Decision Making method has been used to analyze the sensitivity of these parameters on performance and emission. Results indicate that increasing intake temperature causes the operating condition approaches knock which results in a narrower operating region. Increasing EGR ratio makes possible the expanding of operating range rich limit since it causes delayed combustion…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

HCCI with Wet Ethanol: Investigating the Charge Cooling Effect of a High Latent Heat of Vaporization Fuel in LTC

Stony Brook Univ.-Brian Gainey, James Gohn, Ziming Yan, Khurram Malik, Mozhgan Rahimi Boldaji, Benjamin Lawler
  • Technical Paper
  • 2019-24-0024
Published 2019-09-09 by SAE International in United States
The combustion phasing of Homogeneous Charge Compression Ignition combustion is incredibly sensitive to intake temperature. Controlling the intake temperature on a cycle-to-cycle basis is one-way to control combustion phasing, however accomplishing this with an intake air heater/intercooler is unfeasible. One possible way to control the intake temperature is through the direct injection of fuel. The direct injection of fuel during the intake stroke cools the charge via evaporative cooling. Some heat is absorbed from the incoming air, lowering the in-cylinder temperature, while some heat is absorbed from the piston/cylinder walls if the spray reaches the walls. The amount of heat that is absorbed from the air vs. the walls depends on the spray penetration length. The available spray penetration length can be controlled by the injection timing during the intake stroke. Therefore, if a high latent heat of vaporization fuel is used, the intake valve closing temperature will become very sensitive to injection timing, allowing for cycle-to-cycle control of combustion phasing.Ethanol is a fuel with a high latent heat of vaporization and therefore possesses a…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

On the HCCI Octane Boosting Effects of γ-Valerolactone

King Abdullah Univ. of Science & Tech.-Jean-Baptiste Masurier, Binod Giri, Gani Issayev, Bengt Johansson, Aamir Farooq
  • Technical Paper
  • 2019-24-0026
Published 2019-09-09 by SAE International in United States
This study examined the octane boosting effects of γ-valerolactone, a fuel derived from lignocellulosic biomass, under Homogeneous Charge Compression Ignition (HCCI) combustion mode. The experiments were performed in a Cooperative Fuel Research (CFR) engine under four sets of conditions defined by the combinations of intake temperatures and rotation speed. Octane boosting effects were rated with FACE (Fuel for Advanced Combustion Engine) J gasoline as a base fuel. Due to the non-miscibility of γ-valerolactone into FACE J, a new approach was proposed in which the octane boosting effect of a mixture comprised up of two-third γ-valerolactone and one-third ethanol was investigated. To evaluate the effect of γ-valerolactone, the octane boosting effect of pure ethanol into FACE J was also investigated such that comparison can be drawn. Further attempts were made to extract the octane boosting effects of pure γ-valerolactone. For convenience, both volumetric and molar approaches were considered to rationalize the experimental results. The results showed that γ-valerolactone is a good octane booster, and that it possesses higher octane enhancement potential than ethanol for a low…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

A Mixing Timescale Model for PDF Simulations of LTC Combustion Process in Internal Combustion Engines

Istituto Motori CNR-Ezio Mancaruso, Bianca Maria Vaglieco
University of Versailles Saint Quentin-Fadila Maroteaux
Published 2019-09-09 by SAE International in United States
Transported probability density function (PDF) methods are currently being pursued as a viable approach to model the effects of turbulent mixing and mixture stratification, especially for new alternative combustion modes as for example Homogeneous Charge Compression ignition (HCCI) which is one of the advanced low temperature combustion (LTC) concepts. Recently, they have been applied to simple engine configurations to demonstrate the importance of accurate accounting for turbulence/chemistry interactions. PDF methods can explicitly account for the turbulent fluctuations in species composition and temperature relative to mean value. The choice of the mixing model is an important aspect of PDF approach. Different mixing models can be found in the literature, the most popular is the IEM model (Interaction by Exchange with the Mean). This model is very similar to the LMSE model (Linear Mean Square Estimation). Other models are available in the literature, e.g. the MC model (Modified Curl model), the EMST model (Euclidian Minimum Spanning Tree) and the PMSR model (Pairwise Mixing Stirred Reactor). The IEM and the LMSE models relax scalar values in each particle…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Oxy-Fuel HCCI Combustion in a CFR Engine with Carbon Dioxide as a Thermal Buffer

King Abdullah Univ of Science & Tech-JEAN-BAPTISTE MASURIER, Ali Elkhazraji, Bengt Johansson
King Abdullah Univ. of Science & Tech.-Abdulrahman Mohammed
Published 2019-09-09 by SAE International in United States
Global warming and the increasingly stringent emission regulations call for alternative combustion techniques to reduce CO2 emissions. Oxy-fuel combustion is one of those techniques since the combustion products are easily separated by condensing the water and storing CO2. A problem associated with the burning of fuel using pure oxygen as an oxidant is that it results in high adiabatic flame temperature. This high flame temperature is decreased by introducing a thermal buffer to the system. A thermal buffer in this context is any gas that does not participate in combustion but at the same time absorbs some of the released heat and thus decreases the temperature of the medium. Many experiments have been conducted to study oxy-fuel combustion in ICE using noble gases as thermal buffers. However, those experiments focused on using hydrogen as a fuel to avoid any build-up of CO2 in the system. On the contrary, the work presented in this paper investigates using CO2 as a thermal buffer for oxy-fuel combustion in HCCI engines. Experiments were performed on a standard Waukesha variable…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Optimization of Multi Stage Direct Injection-PSCCI Engines

Università degli Studi della Basilicata-Annarita Viggiano, Vinicio Magi
  • Technical Paper
  • 2019-24-0029
Published 2019-09-09 by SAE International in United States
The more and more stringent regulations on emissions lead the automotive companies to develop innovative solutions for new powertrain concepts, including the employment of advanced combustion strategies and mixture of fuels with different thermochemical properties. HCCI combustion coupled with the partial direct injection of the charge is a promising technique, in order to control the performance and emissions and to extend the operating range.In this work an in-house developed multi-dimensional CFD software package has been used to analyze the behavior of a multi stage direct injection - partially stratified charge compression ignition engine fueled with PRF97. A combustion model based on the partially stirred reactor concept to include the influence of turbulence on chemistry has been employed. Specifically, a skeletal kinetic reaction mechanism for PRF oxidation, with a dynamic adaptive chemistry technique to reduce the computational cost of the simulations has been used. Most of the fuel is injected during the intake stroke, in order to get a homogeneous mixture of fuel and air, whereas the remaining part is injected at the end of the…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Mazda finally ready with Skyactiv-D for U.S.

Automotive Engineering: June 2019

Paul Seredynski
  • Magazine Article
  • 19AUTP06_14
Published 2019-06-01 by SAE International in United States

Mazda announced the long-awaited arrival of its Skyactiv-D diesel engine to the U.S. at April's New York International Auto Show. The 2.2L twin-sequential turbocharged 4-cylinder diesel is available for pre-order now in the highest AWD trim of Mazda's best-selling vehicle, the 2-row, 5-seat Mazda CX-5 SUV. The 2019 model with the diesel engine has a starting MSRP of $41,000-a $4K premium over the equivalent gasoline trim-with deliveries expected to begin this summer.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

TSCI with Wet Ethanol: An Investigation of the Effects of Injection Strategy on a Diesel Engine Architecture

SUNY-Stonybrook-Ziming Yan
Stony Brook University-Brian Gainey, James Gohn, Mozhgan Rahimi Boldaji, Benjamin Lawler
Published 2019-04-02 by SAE International in United States
Thermally Stratified Compressions Ignition (TSCI) is a new advanced, low temperature combustion concept that aims to control the thermal stratification in the cylinder in order to control the heat release process in a lean, compression-ignition combustion mode. This work uses “wet ethanol”, a mixture of 80% ethanol and 20% water by mass, to increase thermal stratification beyond what naturally occurs, via evaporative cooling of a split direct injection. TSCI with wet ethanol has previously shown the potential to increase the high-load limit when compared to HCCI. The experiments conducted in this paper aim to fundamentally understand the effect that injection strategy has on the heat release process in TSCI.TSCI employs a split-injection strategy in which an injection during the intake stroke allows the majority of the fuel to premix with the air and an injection during the compression stroke introduces the desired level of thermal stratification to control the heat release rate. A single injection at -350 deg aTDC was found to be the most effective way to inject fuel during the intake stroke. The…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

The Physical and Chemical Effects of Fuel on Gasoline Compression Ignition

King Abdullah University of Science & Technology-R. Vallinayagam, Ponnya Hlaing, Abdullah S. AlRamadan, Yanzhao An, Bengt Johansson
Saudi Aramco-Jaeheon Sim, Junseok Chang
Published 2019-04-02 by SAE International in United States
In the engine community, gasoline compression ignition (GCI) engines are at the forefront of research and efforts are being taken to commercialize an optimized GCI engine in the near future. GCI engines are operated typically at Partially Premixed Combustion (PPC) mode as it offers better control of combustion with improved combustion stability. While the transition in combustion homogeneity from convectional Compression Ignition (CI) to Homogenized Charge Compression Ignition (HCCI) combustion via PPC has been comprehensively investigated, the physical and chemical effects of fuel on GCI are rarely reported at different combustion modes. Therefore, in this study, the effect of physical and chemical properties of fuels on GCI is investigated. In-order to investigate the reported problem, low octane gasoline fuels with same RON = 70 but different physical properties and sensitivity (S) are chosen. Fuels with comparable sensitivity and RON are chosen to study the impact of physical properties on GCI. On the other hand, by keeping the same RON and physical properties, the effect of sensitivity on GCI is investigated. In this regard, three test…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Triple Injection Strategies for Gasoline Compression Ignition (GCI) Combustion in a Single-Cylinder Small-Bore Common-Rail Diesel Engine

Imagineering Inc.-Yuji Ikeda
The University of New South Wales-Xinyu Liu, Harsh Goyal, Sanghoon Kook
Published 2019-04-02 by SAE International in United States
Implementing triple injection strategies in partially premixed charge-based gasoline compression ignition (GCI) engines has shown to achieve improved engine efficiency and reduced NOx and smoke emissions in many previous studies. While the impact of the triple injections on engine performance and engine-out emissions are well known, their role in controlling the mixture homogeneity and charge premixedness is currently poorly understood. The present study shows correspondence between the triple injection strategies and mixture homogeneity/premixedness through the experimental tests of second/third injection proportion and their timing variations with an aim to explain the observed GCI engine performance and emission trends. The experiments were conducted in a single cylinder, small-bore common-rail diesel engine fuelled with a commercial gasoline fuel of 95 research octane number (RON) and running at 2000 rpm and 830 kPa indicated mean effective pressure conditions. While the first injection proportion and timing were fixed at 40% and 170 °CA bTDC, the second injection proportion was varied between 5 and 20% (i.e. third injection of 40~55%) and the timing was varied from 20 to 80 °CA…
This content contains downloadable datasets
Annotation ability available