CAJ | 학술논문

为实现柴油机的高效低排放燃烧，研究了在晚喷条件下的超多喷孔喷射对高压共轨柴油机喷雾、燃烧和排放特性的影响。利用KIVA-3V程序，对一台6缸高压共轨柴油机进行三维模拟，并对其进行了试验验证。结果表明：与传统喷油器相比，超多喷孔喷油器上、下层油束的干涉作用使喷雾形态显得分散很多，这有利于雾化和蒸发。采用超多喷孔喷油器后，呈预混燃烧。与传统喷油器方案相比，放热率峰值增大60%，NOx排放增大36%，碳烟生成区域明显减小、峰值下降48%。在保证动力性的前提下，采用超多喷孔喷油器和废气再循环技术、推迟喷油、提高喷射压力，NOx降低64%，碳烟降低46%。因而，这种柴油机能够实现高效清洁预混燃烧。
위실현시유궤적고효저배방연소，연구료재만분조건하적초다분공분사대고압공궤시유궤분무、연소화배방특성적영향。이용KIVA-3V정서，대일태6항고압공궤시유궤진행삼유모의，병대기진행료시험험증。결과표명：여전통분유기상비，초다분공분유기상、하층유속적간섭작용사분무형태현득분산흔다，저유리우무화화증발。채용초다분공분유기후，정예혼연소。여전통분유기방안상비，방열솔봉치증대60%，NOx배방증대36%，탄연생성구역명현감소、봉치하강48%。재보증동력성적전제하，채용초다분공분유기화폐기재순배기술、추지분유、제고분사압력，NOx강저64%，탄연강저46%。인이，저충시유궤능구실현고효청길예혼연소。
The effects of ultramultihole injection on spray, combustion, and emission characteristics were investigated for late injection conditions to realize high-efifciency, low-emission combustion in a high-pressure common-rail diesel-engine by ultramultihole injection. A 3-D simulation model was set up for a six-cylinder high-pressure common-rail diesel engine using a KIVA-3V code, and was then experimentaly validated. The results show that the interference between the upper-layer jets and the lower-layer jets of the ultramultihole nozzle makes the spray shape more lfeecy compared with the traditional injector, in favor of the spray atomization and vaporization. The in-cylinder mixture by ultramultihole nozzles distributes more evenly than the mixture using traditional injectors, and the combustion process is mainly premixed combustion. The peak heat release rate increases by 60%, the NOx emission increases by 36%, the soot emission formation region decreases clearly, and the soot emission maximum decreases by 48%. The emission decreases 64% for NOx with 46% for soot, without the power penalty by using the ultramultihole nozzle and exhaust gas recirculation (EGR) technique, the postponing injection, and the increasing injection pressure. Therefore, high-efifciency clean premixed combustion can be realized in a high-pressure common-rail diesel-engine with ultramultihole technology.