Performance and exhaust emission analysis on pongamia biodiesel with different open combustion chambers in a DI diesel engine

Abstract

This study presents effects of combustion chamber geometries (hemispherical, toroidal and shallow) by using pongamia oil methyl ester (POME) blended with diesel (20:80) in a single cylinder, direct injection diesel engine. Brake thermal efficiency for toroidal combustion chamber was found higher than that of other two combustion chambers. Significant improvement in reduction of particulates, carbon monoxide and unburnt hydrocarbons was observed for toroidal combustion chamber compared to the other two. However, nitrogen oxides were slightly higher for toroidal combustion chamber.