Development of Flame Propagation Model Considering Lewis Number Effect for Rich Fuel Mixture for Gasoline SI Engines

Abstract

The purpose of this research is to include the phenomenon that occurs because of “Wrinkle (Stretch)” which naturally generates to the flame surface under a rich condition that promotes the burning speed. This happens in a gasoline fuel combustion that is heavier than air. In the present study, the unstable flame was formed due to the imbalance of the mass diffusion and the temperature diffusion of the fuel was modeled. The laminar burning speed model was developed by considering the stretch. The model has shown the capability to reproduce the heat generation (heat release rate) at high accuracy in comparison with experimental data. The simulation was carried out for both homogeneous and the stratification combustion and validated with experimental data. Considering the flame stretch made 3-D combustion simulation tool high accuracy from lean to rich fuel mixture condition.