Gas-Diesel (dual-fuel) modeling in diesel engine environment

The aim of this paper is to investigate the emission and performance charac teristics of a commercial diesel engine (Deutz FL8 413F) being operated on natural gas with pilot diesel ignition. A computer program has been develop ed to model the experimental data using a chemical kinetic reaction mechani sm of the Gas-Diesel (dual-fuel) combustion. A detailed chemical kinetic re action mechanisms of natural gas and NOx were used to predict the main comb ustion characteristics (temperature, pressure and species concentrations) u nder the conditions of this study. The following sections include a descrip tion of the experimental facilities, discussion of numerical simulation and engine test results. The performance in terms of accuracy of the networks is assessed by comparison with the experiments. A reasonably good predictio n of performance and emission was obtained by computation covering the whol e range of the engine operating conditions. It can be summarized that the r esults of this study are satisfactory. (C) 2001 Editions scientifiques et m edicales Elsevier SAS.