Development of Flame Propagation Model for Engine Combustion by LES

Abstract

A novel combustion model for large eddy simulation (LES) of gasoline engines is developed. Unlike the conventional models based on Reynolds averaged Navier-Stokes (RANS) models, the new model is originally described by means of fractal characteristics of flame front and universal flame speed expression in the subgrid scale (SGS). The validity of this fractal combustion model is examined through the experimental combustion period and cyclic variations. The computational results agree well with the experimental data.