基于后喷策略的柴油机时序分区燃烧模拟  

Simulation of Timing-Sequential Regionalized Combustion of a Diesel Engine Based on Post Injection Strategy

作　　者：刘忠长[1] 金华玉[2] 王忠恕[1] 沈照杰[1] 李康[2] 

机构地区：[1]吉林大学汽车动态模拟国家重点实验室,长春130025 [2]中国第一汽车集团公司技术中心,长春130011

出　　处：《燃烧科学与技术》2010年第1期23-29,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50676040);国家重点基础研究发展计划(973)资助项目(2007CB210003)

摘　　要：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.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.

关 键 词：后喷 分区燃烧 数值模拟 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]