Abstract
Diesel spray flame can be accurately predicted since Large Eddy Simulation (LES) can directly solve large-scale vortices. In this study, LES of the diesel spray flame in the combustion vessel is performed using KIVALES with a combustion model that applies CTC (Characteristic Time-scale Combustion) model to premixed combustion and FTS (Flamelet Time Scale) model to diffusion combustion. Damkohler number is used to determine premixed combustion or diffusion combustion. The effect of fuel droplet evaporation is considered in the transport equation of mixture fraction variance in order to improve the description of mixture fraction and its variance. Results show that the proposed combustion model can be applied accordingly to combustion configurations using the Damkohler number calculated using the turbulent characteristic time scale of the constant value.
