This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
LES Simulation of Flame Propagation in a Direct-Injection SI-Engine to Identify the Causes of Cycle-to-Cycle Combustion Variations
Technical Paper
2013-01-1084
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
A Large-Eddy-Simulation (LES) approach is applied to the calculation of multiple SI-engine cycles in order to study the causes of cycle-to-cycle combustion variations. The single-cylinder research engine adopted in the present study is equipped with direct fuel-injection and variable valve timing for both the intake and exhaust side. Operating conditions representing cases with considerably different scatter of the in-cylinder pressure traces are selected to investigate the causes of the cycle-to-cycle combustion variations.
In the simulation the engine is represented by a coupled 1D/3D-CFD model, with the combustion chamber and the intake/exhaust ports modeled in 3D-CFD, and the intake/exhaust pipework set-up adopting a 1D-CFD approach. The adopted LES flow model is based upon the well-established Smagorinsky approach. Simulation of the fuel spray propagation process is based upon the discrete droplet model. Modeling of flame propagation is realized on the basis of the coherent flame concept. Spark ignition and early flame kernel formation is approximated by prescribing the initial flame surface density in a sphere around the spark location.
For the LES study of the causes of the cycle-to-cycle combustion variations the simulations are run for more than 20 cycles for each of the selected operating points in order to obtain a statistically relevant set of results for the in-cylinder flow, mixture formation and combustion quantities. Assessment of the impact of the instantaneous, cycle-resolved flow quantities on the early flame kernel formation and the subsequent main combustion process is achieved by analysis of both spatially resolved and cylinder-averaged result data.
Recommended Content
Authors
Citation
Tatschl, R., Bogensperger, M., Pavlovic, Z., Priesching, P. et al., "LES Simulation of Flame Propagation in a Direct-Injection SI-Engine to Identify the Causes of Cycle-to-Cycle Combustion Variations," SAE Technical Paper 2013-01-1084, 2013, https://doi.org/10.4271/2013-01-1084.Also In
References
- Ozdor , N. , Dulger , M. , and Sher , E. Cyclic Variability in Spark Ignition Engines A Literature Survey SAE Technical Paper 940987 1994 10.4271/940987
- Scholl , D. and Russ , S. Air-Fuel Ratio Dependence of Random and Deterministic Cyclic Variability in a Spark-Ignited Engine SAE Technical Paper 1999-01-3513 1999 10.4271/1999-01-3513
- Shigarkanthi , V. , Porpatham , E. , and Ramesh , A. Experimental Investigation and Modeling of Cycle by Cycle Variations in a Gas Fuelled S.I. Engine SAE Technical Paper 2005-01-3480 2005 10.4271/2005-01-3480
- Ji , C. and Ronney , P. Modeling of Engine Cyclic Variation by a Thermodynamic Model SAE Technical Paper 2002-01-2736 2002 10.4271/2002-01-2736
- Mehrani , P. and Watson , H. Modeling the Effects of Mixture Composition on Cyclic Variability SAE Technical Paper 2007-01-0672 2007 10.4271/2007-01-0672
- Abdi Aghdam , E. , Burluka , A. , Hattrell , T. , Liu , K. et al. Study of Cyclic Variation in an SI Engine Using Quasi-Dimensional Combustion Model SAE Technical Paper 2007-01-0939 2007 10.4271/2007-01-0939
- Stone , C. , Brown , A. , and Beckwith , P. Cycle-by-Cycle Variations in Spark Ignition Engine Combustion - Part II: Modeling of Flame Kernel Displacements as a Cause of Cycle-by-Cycle Variations SAE Technical Paper 960613 1996 10.4271/960613
- Holmström , K. and Denbratt , I. Cyclic Variation in an SI Engine Due to the Random Motion of the Flame Kernel SAE Technical Paper 961152 1996 10.4271/961152
- Goryntsev , D. , Sadiki , A. , and Janicka , J. Cycle-to-Cycle Variations Based Unsteady Effects on Spray Combustion in Internal Combustion Engines by Using LES SAE Technical Paper 2012-01-0399 2012 10.4271/2012-01-0399
- Vermorel , O. , Richard , S. , Colin , O. , Angelberger , C. et al. Multi-Cycle LES Simulations of Flow and Combustion in a PFI SI 4-Valve Production Engine SAE Technical Paper 2007-01-0151 2007 10.4271/2007-01-0151
- Vitek , O. , Macek , J. , Tatschl , R. , Pavlovic , Z. et al. LES Simulation of Direct Injection SI-Engine In-Cylinder Flow SAE Technical Paper 2012-01-0138 2012 10.4271/2012-01-0138
- AVL FIRE Manual v2011 AVL List GmbH Graz 2011
- Dukowicz , J.K. A Particle-Fluid Numerical Model for Liquid Sprays J. Comp. Physics 35 229 253 1980
- Richard , S. , Colin , O. , Vermorel , O. , Benkenida , A. , Angelberger , C. , Veynante , D. Towards Large Eddy Simulation of Combustion in Spark Ignition Engines Proc. of the Combustion Institute 31 3059 3066 2007
- Boger , M. , Veynante , D. , Boughanem , H. , Trouvé , A. Direct Numerical Simulation Analysis of Flame Surface Density Concept for Large Eddy Simulation of Turbulent Premixed Combustion Symposium (International) on Combustion 27 1 1998 917 925
- Charlette , F. , Meneveau , C. , Veynante , D. A Power-law Flame Wrinkling Model for LES of Premixed Turbulent Combustion, Part I: Non-Dynamic Formulation and Initial Tests Combustion and Flame 131 159 180 2002
- AVL BOOST Manual v2011 AVL List GmbH Graz 2011
- Krajnovic , S. , Davidson , L. Flow Around a Three- Dimensional Bluff Body 9th Int. Symposium on Flow Visualization Carlomagno G. M. and Grant I. Heriot-Watt University Edinburgh 2000