摘要
采用试验和数字模拟方法研究了两次喷射对增压直喷(TGDI)汽油机产生超级爆震的影响.结果表明:与单次喷射相比,两次喷射模式对超级爆震现象具有抑制作用;在两次喷射模式中,将第二次喷油结束时刻推迟至进气行程末期或压缩行程,会促进超级爆震现象发生,而增大第二次喷油的比例有助于抑制超级爆震;结合缸内温度分布模拟结果发现,由第一次喷油激起的润滑油油滴和第二次喷油引起的缸内温度场变化是形成超级爆震诱发热点的重要因素.
The effects of split injection on super knock in a turbo-charged gasoline direct injection （TGDI） engine were studied experimentally and numerically. Results show that split injection has an inhibition to super knock compared with single injection. In split injection cycles, super knock times significantly increase by retarding the end time of second injection to the end of intake stroke or compression stroke, and increasing the ratio of second injection inhibits the super knock. Both experiment and simulation show that oil droplet aroused by the first fuel injection and variation of temperature distribution in cylinder caused by the second fuel injection, are the key factors affecting the formation of the super knock inducing hot spot.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2016年第6期518-523,共6页
Transactions of Csice
基金
国家自然科学基金资助项目(51675262,51608221)
淮安市科技计划资助项目(HAS2015015)
关键词
汽油机
增压直喷
两次喷射
超级爆震
gasoline engine
turbo-charged gasoline direct injection （TGDI）
split injection
super knock
作者简介
吕猛，博士研究生，E—mail：almnking@163．com．
鲍晓峰，研究员，E—mail：baoxy@craes．org．cn．
