CAJ | 학술논문

前期研究发现可以把后喷理解为一种时间顺序意义上的分区燃烧.为深入理解认识这种分区燃烧,采用STAR-CD 对高压共轨柴油机进行了改变主后喷间隔的燃烧模拟.结果表明,滚流利用主、后喷的间歇期引导氧气补充到喷油锥角区域内形成富氧区,而后,后喷喷出,从而实现了分区燃烧,后喷燃油燃烧较好,碳烟排放显著下降;要组织最佳的分区燃烧就是要在保证补充氧气足够多的前提下,找到一个尽可能小的主后喷间隔.
전기연구발현가이파후분리해위일충시간순서의의상적분구연소.위심입리해인식저충분구연소,채용STAR-CD 대고압공궤시유궤진행료개변주후분간격적연소모의.결과표명,곤류이용주、후분적간헐기인도양기보충도분유추각구역내형성부양구,이후,후분분출,종이실현료분구연소,후분연유연소교호,탄연배방현저하강;요조직최가적분구연소취시요재보증보충양기족구다적전제하,조도일개진가능소적주후분간격.
According to preceding researches,combustion of post injection fuel can be seen as a kind of regionalized combustion based on timing sequence. In order to understand this kind of regionalized combustion deeply,simulations were carried out on combustion of a common rail diesel engine under post injection mode. The results indicate that much oxygen moves into injection-cone region guided by tumble flow in the interim period between main injection and post injection and forms a rich-oxygen region,and then post injection fuel is injected into this region. So regionalized combustion is realized and post injection fuel burns more completely,which results in a remarkable reduction of soot. In order to organize the best regionalized combustion,the interval between main injection and post injection should be as small as possible on the premise that oxygen is enough.