This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Study of a Stratification Effect on Engine Performance in Gasoline HCCI Combustion by Using the Multi-zone Method and Reduced Kinetic Mechanism
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 15, 2009 by SAE International in United States
Annotation ability available
A gasoline homogeneous charged compression ignition (HCCI) called the controlled auto ignition (CAI) engine is an alternative to conventional gasoline engines with higher efficiency and lower emission levels. However, noise and vibration are currently major problems in the CAI engine. The problems result from fast burning speeds during combustion, because in the CAI engine combustion is controlled by auto-ignition rather than the flame.
Thus, the ignition delay of the local mixture has to vary according to the location in the combustion chamber to avoid noise and vibration. For making different ignition delays, stratification of temperature or mixing ratio was tested in this study. In charge stratification, which determines the difference between the start of combustion among charges with different properties, two kinds of mixtures with different properties flow into two intake ports.
In this study, calculations start from the intake valve opening (IVO) to consider flow motion, turbulent, and heat transfer effects. In gasoline engines, inducted gases are mixed due to piston motion, turbulent flow, strong tumble, and weak swirl motion. In order to consider these effects, a full engine mesh, which has valve and piston motions, was used in this study. A Multi-zone method was adopted to calculate the chemical reaction in the full engine mesh to save computational time. A reduced chemical kinetic mechanism, which has 47 species and 67 reactions, was used with simplified assumptions. A gasoline surrogate, composed of iso-octane, n-heptane, and toluene, was used to describe the gasoline fuel.
By non-symmetric fuel injection, fuel stratification was accomplished. Stratified cases show lower maximum pressure and smaller pressure rising rates than those of the homogeneous case. And fuel stratification was helpful to extend the combustion duration.
CitationLee, K. and Min, K., "Study of a Stratification Effect on Engine Performance in Gasoline HCCI Combustion by Using the Multi-zone Method and Reduced Kinetic Mechanism," SAE Technical Paper 2009-01-1784, 2009, https://doi.org/10.4271/2009-01-1784.
- Stanglmaier R. H. Robets C. E. “Homogeneous Charge Compression Ignition (HCCI): Benefits, Compromise and Future Applications” SAE Paper No. 1999-01-3682 1999
- Koopmans, L. Ogink, R. Denbratt, I. “Direct Gasoline Injection in the Negative Valve Overlap of Homogeneous Charged Compression Ignition Engines” SAE 2003-01-1854 , JSAE 20030195 2003
- Ogink R. Golovitchev V. “Gasoline HCCI Modeling: Computer Program Combining Detailed Chemistry and Gas Exchange Processes” SAE paper No. 2001-01-3614 2001
- Aceves, S. et al. “A Multi-Zone Model for Prediction of HCCI Combustion and Emissions” SAE paper No. 2000-01-0327 2000
- Naik, C.V. Pitz, W.J. Westbrook, C.K. Sjöberg, M. Dec, J.E. et al. “Detailed Chemical Kinetic Modeling of Surrogate Fuels for Gasoline and Application to an HCCI Engine” SAE paper No. 2005-01-3741 2005
- Mori, S. Lang, O. Pischinger S. et al. “Type Analysis of EGR-Strategies for Controlled Auto Ignition (CAI) by Using Numerical Simulations and Optical Measurements” SAE paper No. 2006-01-0630 2006
- Salvador M. Aceves S. et al. “A Decoupled Model of Detiled Chemical Kinetics for Prediction of Iso-Octane HCCI Combustion” SAE paper No. 2001-01-3612 2001
- Kelly-Zion, P.L. Dec, J. “A Computational Study of the Effects of Fuel-Type on Ignition Time in HCCI Engines” 28th Symposium (International) on Combustion Combustion Institute 2000
- Sjöberg, M. Dec, J. E. “Effects of Engine Speed, Fueling Rate and Combustion Phasing on the Thermal Stratification Required to Limit HCCI Knocking Intensity” SAE paper No. 2005-01-2125 2005
- Sjöberg, M. Dec, J. E. Babajimopoulos, A. Assanis, D. “Comparing Enhanced Natural Thermal Stratification Against Retarded Combustion Phasing for Smoothing of HCCO Heat-Release Rates” SAE paper No. 2004-01-2994 2004
- Yao M. Zheng Z. “A numerical Investigation on Effects of Charge Stratification on HCCI Combustion” SAE paper No. 2007-01-4132 2007
- Kim, Y. et al. “Development of a Reduced Chemical Kinetic Mechanism and Ignition Delay Measurement in a Rapid Compression Machine for CAI Combustion,” SAE paper No. 2007-01-0218 2007
- Kim Y. “A Study on the CAI Combustion Characteristics Using a Reduces Chemical Kinetics Mechanism” Seoul Nation University 2007
- Lee K. Lim J. Kim Y. Min K. “The Combustion Modeling In a CAI Engine by Using Coupled Multi-zone and Reduced Kinetic Mechanism” COMODIA 2008 276 274 2008
- Aceves S. M. et al “A Decoupled Model of Detailed Fluid Mechanics Followed by Detailed Chemical Kinetics for Prediction of Iso-Octane HCCI Combustion” SAE paper No. 2001-01-3612 2001