Modeling of Gasoline Direct Injection Spark Ignition Engines, Andrei Lipatnikov
Background Volvo V40 XC Delphi-GDI-System CFD simulation of GDI combustion Hyundai 1.6 l GDI engine
Background Model development o Chalmers combustion chemistry for gasoline surrogate [1], fist year o Hollow-cone spray [2], second year o Flame Speed Closure (FSC) model [3] Knowledge gap o Simulate DISI engine using OpenFOAM o Very few correlation for flame propagation speed of gasoline o Effects of stratification [1] Huang, C., Golovitchev, V., Lipatnikov, A. SAE 2010-01-0543 [2] Huang, C., Lipatnikov, A. SAE 2011-01-1896 [3] Lipatnikov, A.N., Fundamentals of premixed turbulent combustion, CRC Press, 2012.
Goals To develop a numerical platform based on the open source code and models and for simulations of stratified turbulent combustion in DISI engines.
Implement FSC model of premixed turbulent combustion Extend the model to stratified flames and study effects of each extension step-by-step o Mean density o Laminar flame speed o Beta-PDF Approach o Evaporation source term in variance eq. Compare simulations with corresponding experimental project within CERC
Implement FSC model of premixed turbulent combustion o Mixture composition, pressure on burning rate o Transient behaviour, from flame kernel to turbulent flame o Preferential diffusion, Lewis number effects o Extensive quantitative validation Extend the model to stratified flames and study effects of each extension step-by-step o Mean density o Laminar flame speed o Beta-PDF Approach o Evaporation source term in variance eq. Compare simulations with corresponding experimental project within CERC
FSC Model homogeneous Methods eq. mean density laminar flame speed, flame temperature stratified eq. chemistry betapdf, evaporation source stratified & turbulence, eqs. P f chemistry
Implement FSC model of premixed turbulent combustion Extend the model to stratified flames and study effects of each extension step-by-step o Mean density BML o Laminar flame speed o Beta-PDF Approach o Evaporation source term in variance eq. Compare simulations with corresponding experimental project within CERC
Effect of Results
Implement FSC model of premixed turbulent combustion Extend the model to stratified flames and study effects of each extension step-by-step o Mean density o Laminar flame speed o Beta-PDF Approach o Evaporation source term in variance eq. Compare simulations with corresponding experimental project within CERC
Stratified Methods eq. Chalmers* Gülder s Constant S L *gasoline surrogate mechanism (120 species, 677 reaction), pressure 1-30 bar, temperature 300-800K, equivalence ratio 0.2-2.0 U t
Results Effect of S L
Implement FSC model of premixed turbulent combustion Extend the model to stratified flames and study effects of each extension step-by-step o Mean density o Laminar flame speed o Beta-PDF Approach o Evaporation source term in variance eq. Compare simulations with corresponding experimental project within CERC
Methods Stratified + turbulence eq. eq. =
Effect of beta-pdf Results
Implement FSC model of premixed turbulent combustion Extend the model to stratified flames and study effects of each extension step-by-step o Mean density o Laminar flame speed o Beta-PDF Approach o Evaporation source term in variance eq. Compare simulations with corresponding experimental project within CERC
Results Effect of evaporation source term ( field)
Results Effect of evaporation source term
Results Effect of evaporation source term ( field) w/o evaporation source term w evaporation source term -20 CAD atdc
Conclusions and Future Work Implement FSC model of premixed turbulent combustion Extend the model to stratified flames and study effects of each extension step-by-step o Mean density o Laminar flame speed o Beta-PDF o Evaporation source term in variance eq. o Effect of all extensions on NO formation o Parametric studies, e.g. injection timing, equivalence ratio Compare simulations with corresponding experimental project within CERC
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