Comprehensive Study of the Effects of Biodiesel Addition on Diesel Engine premixed Charge Compression Ignition Phenomenon by Computational Fluid Dynamics

In this study, a numerical study is performed by KIVA-CHEMKIN code to investigate the effects of biodiesel addition and exhaust gas recirculation (EGR) on diesel engine premixed charge compression ignition (PCCI) combustion and emission characteristics. The studies are performed for neat diesel fuel and mixture of 10 to 40% biodiesel addition at 67%, 50% and 40% EGR. The main innovation of the present work is analyzing the chemical, thermodynamic and dilution effects of biodiesel addition as well as different EGR ratios on PCCI combustion behavior. Rate of production analysis indicate that for the different biodiesel ratios, the effect of reaction nC7H16+HO2=C7H15-2+H2O2 is more effective on the start of combustion compared to the other reactions. For a defined biodiesel addition, with decreasing EGR, THC and CO are decreased, whilst NOx and indicated specific fuel consumption (ISFC) are increased.