Numerical investigation on the effects of EGR on CI engine characteristics using soyabean biodiesel

Abstract

In this work an attempt has been made to numerically investigate the effect of soyabean biodiesels on an unmodified CI engine and then to study and reduce the NOx emission by the introduction of exhaust gas recirculation (EGR) technique at the rates of 10% and 20%. Compared to no EGR condition for the neat biodiesel, the NOx emission is reduced by 44% and 70% with 10% and 20% EGR respectively. But the increase in the EGR rate deteriorates the engine performance and increases the emissions, other than NOx. Thus, EGR helps in reducing NOx emission but its rate of introduction has to be bounded by a limit.