후분사시기가 대형디젤엔진의 연소 및 배기에 미치는 영향에 관한 수치해석적 연구

The objective of this numerical investigation is to analyze characteristics of combustion and emission on various post injection timing in heavy duty diesel engine by using AVL-FIRE. The diesel engine makes NO but it is available to reduce NO by addition to post injection. This numerical study was implemented under conditions with post injection timing 10CA, 20CA. As a result, the longer dwell time is, the higher peak pressure. But end of pressure curve tended to decrease compared to single injection. In emissions, NO was decreased and soot was increased in the case of longer dwell time. Thus, it is available to decrease NO formation.