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

The aim of this paper is to investigate the emission and performance characteristics of a commercial diesel engine (Deutz FL8 413F) being operated on natural gas with pilot diesel ignition. A computer program has been developed to model the experimental data using a chemical kinetic reaction mechanism of the Gas-Diesel (dual-fuel) combustion. A detailed chemical kinetic reaction mechanisms of natural gas and NOx were used to predict the main combustion characteristics (temperature, pressure and species concentrations) under the conditions of this study. The following sections include a description 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 prediction of performance and emission was obtained by computation covering the whole range of the engine operating conditions. It can be summarized that the results of this study are satisfactory. (C) 2001 Editions scientifiques et medicales Elsevier SAS.