축소반응기구를 이용한 DME 엔진의 연소 및 배기 특성에 관한 수치 해석

초록

This study performed the numerical simulation of chemical reaction mechanism for ignition and combustion phenomena of dimethyl ehter (DME) in a diesel engine using KIVA-CHEMKIN code. The reduced reaction mechanism which was consisted of 44 species and 166 reactions was obtained from the base detailed reaction mechanism which was composed of 79 species and 351 reaction steps. The spray combustion and emission characteristics when applying the reduced reaction mechanism were validated by comparing with applying the detailed reaction mechanism and the calculation time reduction ratio was also evaluated. The calculation accuracy of the reduced reaction mechanism was good agreement with that of the detailed reaction mechanism for combustion and emission characteristics under various injection timings and the calculation time was reduced about 45% at the conditions that the chemical reaction was frequently generated.

키워드