A Stochastic Model of an Unsteady Turbulent Diffusion Flame in a Confined Space : 2nd Report, Application to Diesel Combustion

Abstract

Based on the stochastic model developed in the first report, description of the combustion process occurring in a diesel engine has been made. The model has been revised to include several factors such as volume change caused by piston motion, an air purity in the cylinder charge. The results show that the measured pressure-time relations in a direct-injection engine may well be reproduced for a range of operational conditions through a proper selection of two empirical parameters that describe initial segregation of fuel and air and the rate of turbulent mixing. The capability of the model to describe the diesel combustion phenomena is finally suggested by the model prediction carried out for nitric oxide formation. The comparison of the prediction with the experimental data shows that the correlation between predicted and exhaust measured concentration is fairly good.