Effects of I-EGR and Pre-Injection on Performance of Gasoline Compression Ignition(GCI)at Low-Load Condition  

作　　者：Binbin Yang Leilei Liu Yan Zhang Jingyu Gong Fan Zhang Tiezhu Zhang 

机构地区：[1]School of Transportation and Vehicle Engineering,Shandong University of Technology,Zibo,255000,China [2]State Key Laboratory of Engines,Tianjin University,Tianjin,300072,China

出　　处：《Energy Engineering》2023年第10期2233-2250,共18页能源工程(英文)

基　　金：sponsored by the projects of National Natural Science Foundation of China (Grant Nos.51806127 and 52075307);Key Research and Development Program of Shandong Province (Grant No.2019GHZ016).

摘　　要：Gasoline compression ignition(GCI)has been considered as a promising combustion concept to yield ultralow NOX and soot emissions while maintaining high thermal efficiency.However,how to improve the low-load performance becomes an urgent issue to be solved.In this paper,a GCI engine model was built to investigate the effects of internal EGR(i-EGR)and pre-injection on in-cylinder temperature,spatial concentration of mixture and OH radical,combustion and emission characteristics,and the control strategy for improving the combustion performance was further explored.The results showed an obvious expansion of the zone with an equivalence ratio between 0.8∼1.2 is realized by higher pre-injection ratios,and the s decreases with the increase of pre-injection ratio,but increases with the increase of i-EGR ratio.The high overlap among the equivalentmixture zone,the hightemperature zone,and the OH radical-rich zone can be achieved by higher i-EGR ratio coupled with higher preinjection ratio.By increasing the pre-injection ratio,the combustion efficiency increases first and then decreases,also achieves the peak value with a pre-injection ratio of 60%and is unaffected by i-EGR.The emissions of CO,HC,NOX,and soot can also be reduced to low levels by the combination of higher i-EGR ratios and a pre-injection ratio of 60%.

关 键 词：Gasoline compression ignition low-load condition internal EGR pre-injection combustion characteristics EMISSIONS 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]