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A Turbulent Combustion Model for a Stratified Charged, Spark Ignited Internal Combustion Engine
Technical Paper
2000-01-0275
ISSN: 0148-7191, e-ISSN: 2688-3627
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SAE 2000 World Congress
Language:
English
Abstract
A turbulent combustion model is described for SI engines with large variations in mixture strength. The model is for a single gas phase fluid at high Reynolds number and treats combustion in the laminar flamelet regime, which is characterized by high Damkholer and low Karlovitz numbers.
An assumed probability density function (pdf) approach is used to extract expressions for mean quantities of interest, which are parameterized on the progress variable and mixture fraction variables. A double delta function pdf is used for the reaction progress variable and a beta function pdf is used for the mixture fraction. The reaction rate term in the progress variable equation is closed using an algebraic expression, which incorporates the effects of mixture strength, pressure and temperature on laminar flame speed.
The model is implemented in two versions of a Computational Fluid Dynamics (CFD) code. The first version simulates reciprocating engine flows and the second simulates combustion in closed vessels. Comparison is made against published experimental data for an engine running a homogeneous charge. Agreement with this experimental result is good based on limitations and assumptions used. Qualitatively predictions of combustion trends in stratified charge engines and closed vessels also show agreement with experiment. However, further validation is required with experimental engine data for stratified charge engines.
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Ranasinghe, J. and Cant, S., "A Turbulent Combustion Model for a Stratified Charged, Spark Ignited Internal Combustion Engine," SAE Technical Paper 2000-01-0275, 2000, https://doi.org/10.4271/2000-01-0275.Also In
References
- Baritaud, T.A. Green, R.M. A 2-D flame visualisation technique applied to the I.C. engine SAE 860025 1986
- Zur Loye, A.O. Bracco, F. V. Two-Dimensional Visualization of Ignition Kernels in an IC Engine Combustion and Flame 65 59 69 1987
- Deschamps, B. Snyder, R. Baritaud, T.A. Effect of flow and gasoline stratification on combustion in a 4-valve SI engine SAE 941993 1994
- Fujimoto, M. Nishida, K. Hiroyasu, H Tabata, M. Influence of Mixture Stratification Pattern on Combustion Characteristics in a Constant-Volume Combustion Chamber SAE 952412 1995
- Arcoumanis, C. Hull, D.R. Whitelaw, J.H. An Approach to Charge Stratification in Lean-Burn, Spark-Ignition Engines SAE 941878 1994
- Baritaud, T.A. Duclos, J.M. Fusci, A. “Modeling Turbulent Combustion and Pollutant Formation in Stratified Charge SI Engines” Twenty-Sixth Symposium (International) on Combustion 2627 2635 1996
- Wallesten, J. Lipatnikov, A.N. Nisbet, J Turbulent Flame Speed Closure Model: “Further Development and Implementation for 3-D Simulation of Combustion in SI Engine” SAE 982613 1998
- Cant, R.S. Bray, K.N.C. “A Theoretical Model of Premixed Turbulent Combustion in Closed Vessels” Combustion and Flame 76 243 263 1989
- Bray, K.N.C. Champion, M. Libby, P. “Flames in Stagnating Turbulence” Turbulent Reacting Flows Libby, P.A. Williams, F.A. 1994
- Bray, K.N.C. Libby, P.A. Moss, J.B. “Unified Modelling Approach for Premixed Turbulent Combustion-Part 1: General Formulation” Combustion and Flame 61 87 102 1985
- Lea, C.P. Watkins, A. P. Differential Stress Modeling of Turbulent flows in model reciprocating engines Proc Inst. Mech. Engrs 211 1997
- Cant, R.S. Pope, S.B. Bray, K.N.C. Modeling of flamelet surface-to-volume ratio in turbulent premixed combustion In 23 rd Symposium (International) on Combustion 809 815 1990
- Cant, R.S. Adewoye, A.A. Bray, K.N.C. A laminar flamelet model of turbulent combustion in spark-ignition engines Proc. ImechE Paper C433/004 103 112 1991
- Brookes, S.J. Cant, R.S. Dowling, A.P. Study of Parallelised Combustion Analysis Methods Project C: Modeling of Combustion Instabilities Fifth Progress Report: 21/9/98-20/12/98 CFD Laboratory Cambridge University Engineering Department 1998
- Abu-Orf, G. M. Laminar Flamelet Reaction Rate Modeling for Spark Ignition Engines University of Manchester Institute of Science and Technology 1996
- Gaskell, P.H. Lau, A.K.C. CCCT Smart New Boundedness Preserving Transport Algorithm Journal for Numerical Methods in Fluids 8 617 641 1988
- Issa, R.I. Solution of the Implicitly Discretised Fluid Flow Equations by Operator Splitting Journal of Computational Physics 62 1 40 65 1986
- Launder, B.E Spalding, D.B. The numerical computation of Turbulent Flows Comp. Methods in App. Mechanics and Engineering 3 269 289 1974
- Witze, P.O. Martin, J.K. Borgnakke, C. Measurements and Predictions of the Precombustion Fluid Motion and Combustion Rates in a Spark Ignition Engine SAE 831697 1983
- Cheng, R.K. Shepherd, I.G. The Influence of Burner Geometry on Premixed Turbulent Flame Propagation Combustion and Flame 85 7 26 1991