CAJ | 학술논문

用试验方法，研究一次预喷射和两次预喷射策略对柴油机燃烧及排放影响。利用一台直列4缸、涡轮增压、高压共轨柴油机，在转速为1?500?r/min时，在中低负荷?（平均有效压力为0.86?MPa和0.43?MPa）下，测量了预喷油量m'和预喷射与主喷射的间隔角α、缸内压力p、燃烧放热率E'，以及一氧化氮NO、碳氢化合物HC、一氧化碳CO和碳烟排放。分析表明：?α和m'都影响预喷和主喷的E'，间隔角对于主喷滞燃期的的影响比预喷油量的影响更大。采用一次预喷射策略时，合理地选择预喷射与主喷射的间隔角和预喷油量，可以降低NO和碳烟排放，并且不会对HC和CO排放造成明显恶化。因此，采用两次预喷射策略可以促进燃油与空气的混合；两次预喷射之间的间隔角较小时，对改善排放的效果更好。
용시험방법，연구일차예분사화량차예분사책략대시유궤연소급배방영향。이용일태직렬4항、와륜증압、고압공궤시유궤，재전속위1?500?r/min시，재중저부하?（평균유효압력위0.86?MPa화0.43?MPa）하，측량료예분유량m'화예분사여주분사적간격각α、항내압력p、연소방열솔E'，이급일양화담NO、탄경화합물HC、일양화탄CO화탄연배방。분석표명：?α화m'도영향예분화주분적E'，간격각대우주분체연기적적영향비예분유량적영향경대。채용일차예분사책략시，합리지선택예분사여주분사적간격각화예분유량，가이강저NO화탄연배방，병차불회대HC화CO배방조성명현악화。인차，채용량차예분사책략가이촉진연유여공기적혼합；량차예분사지간적간격각교소시，대개선배방적효과경호。
The effects of one-pilot injection strategy and two-pilot injection strategy on combustion and emission are investigated in a four-cylinder, turbocharged, high pressure common-rail diesel engine. The pilot-main injection intervals, the pilot injection quantities, the diesel combustion pressures, the heat release rates, and the emissions of NO, HC, CO, and soot were measured. The results show that both pilot-main injection interval and pilot injection quantity strongly affect the pilot combustion heat release and the main combustion heat release, and that the effect of pilot-main injection interval on main combustion ignition delay is more evident than the effect of pilot injection quantity. The emission of NO and soot are reduced without obvious deterioration in HC and CO when choosing appropriate pilot-main injection interval and pilot injection quantity under one-pilot injection strategy. Using two-pilot injection strategy enhances the mixing of fuel and air. The emission is more improved, when the two-pilot injection interval is less.