Reduction of NOx and particulate of a high speed direct-injection diesel engine with high squish combustion chamber

Abstract

In order to realize simultaneous reduction of NOx and Particulate emissions, effects of combustion chamber geometry were investigated in a high speed direct-injection diesel engine. The reentrant combustion chambers with different throat diameter were compared in terms of engine performance, combustion characteristics and emissions such as NOx, particulate and THC. The phenomena of combustion process were also observed with endoscopic high speed photography. The results showed that when the throat diameter of a reentrant combustion chamber was reduced to an extent, NO x and particulate decreased simultaneously due to retarded injection timing and the intensified squish.