디젤엔진에서 분사조건이 연소 및 배기 특성에 미치는 영향 예측

This study numerically investigated the combustion and emission characteristics in accordance with single and split injection conditions. Numerical analysis was performed by using the AVL-FIRE code with the ECFM-3Z combustion model. In-cylinder pressure profiles of calculation results had good agreement with experimental results. In case of early injection (40° BTDC), the combustion and emission characteristics of single injection were deteriorated due to the occurrence of the wall wetting at both the piston head and cylinder liner. However the split injection led to lower the amount of wall wetting and increase the combustion pressure and indicated mean effective pressure (IMEP) through the wide distribution of air-fuel mixture in the cylinder.