Effects of Intake Charging Condition on Smoke Reduction of Post injection in Diesel Engines

Abstract

This study aims at improving understanding of the relation between smoke-reduction effects of post injection and intake charging conditions in small-bore diesel engines. A series of experiments were conducted using a single cylinder diesel engine to investigate the smoke-reduction effect of post injection varying intake pressure and swirl ratio. The results indicated that post injection provides larger reduction of smoke emission at higher swirl ratios for a larger amount of total fuel injection, while the reduction scarcely depends on swirl ratio at a smaller injection amount. Higher intake pressure enhances smoke-reduction effect of post injection.