Alborz Zehni - Engine Expert, Mega Motor
Rahim Khoshbakhti Saray - Professor, Mechanical Engineering Department, Sahand University of Technology
Elahe Neshat - Associate Professor, Mechanical Engineering Department, Sahand University of Technology

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 ۱۰ to ۴۰% biodiesel addition at ۶۷%, ۵۰% and ۴۰% 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 nC۷H۱۶+HO۲=C۷H۱۵-۲+H۲O۲ 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.

PCCI, biodiesel, chemical, Thermodynamic, Dilution, Emission.