废气再循环与燃料辛烷值对均质压燃燃烧特性影响的试验研究  

Experimental Study on Combustion Characteristics of HCCI Engine Influenced by EGR and Octane Number

作　　者：尧命发[1] 张波[1] 郑尊清[1] 陈征[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《内燃机学报》2005年第6期503-509,共7页Transactions of Csice

基　　金：国家重点基础研究发展规划项目(2001CB209201)

摘　　要：在一台单缸直喷式柴油机上研究了废气再循环(EGR)对不同辛烷值燃料均质压燃(HCCI)燃烧特性及排放特性的影响。结果表明,EGR使HCCI着火燃烧推迟、燃烧反应速度降低、缸内压力和平均温度降低,HCCI工况范围向大负荷工况扩展;混合气浓度增大或燃料辛烷值增大,EGR对燃烧效率的影响增大,EGR率升高,燃烧效率降低;不同辛烷值燃料最高燃烧效率出现在高比例EGR率、混合气较浓、靠近爆震燃烧边界的区域。试验结果也表明,辛烷值为60的燃料采用EGR后HCCI覆盖的工况范围最宽。In this paper, the effects of Exhaust Gas Recirculation （EGR） and octane number on combustion characteristics of HCCI engine were investigated. The results showed that EGR could postpone ignition timing, decrease combustion reaction rate, reduce the pressure and mean temperature in cylinder and extend the operation region to the high load mode. With the increase of mixture concentration or fuel octane number, the influence of EGR on combustion efficiency will improve, whereas the combustion efficiency will decrease with the increase of EGR ratio. Maximum combustion efficiency for fuels with various octane numbers appears in the region of high EGR ratio and high mixture concentration, closing to the boundary of knocking. The result also indicated that fuel with octane number of 60 demonstrate the widest operation region under HCCI operation mode.

关 键 词：废气再循环 辛烷值 均质压燃 燃烧特性 排放特性 

分 类 号：TK466[动力工程及工程热物理—动力机械及工程]