不同进气温度条件下燃料特性对均质压燃燃烧过程影响的试验研究  

Experimental Study on the Effect of Fuel Properties on HCCI Combustion Characteristics at Various Intake Temperatures

作　　者：张波[1] 尧命发[1] 杨冬冬[1] 郑尊清[1] 陈征[1] 张全长[2] 邢元[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 [2]广西大学机械工程学院,广西南宁530004

出　　处：《内燃机学报》2008年第1期1-10,共10页Transactions of Csice

基　　金：国家重点基础研究发展规划项目(2001CB209201)

摘　　要：为了研究不同进气温度(Tin)条件下燃料特性对均质压燃(HCCI)燃烧特性、工况范围和排放特性的影响,在一台改装的4缸直喷柴油机上进行了不同辛烷值(RON)基础燃料(PRF)、汽油和含氧燃料的进气加热发动机试验。结果表明,Tin较低时,PRF着火时刻最早,缸内最大爆发压力和峰值放热率最高,其次是汽油和含氧燃料,但Tin较高时,则是汽油燃料着火时刻最早,燃烧效率和能够实现的最高指示效率最高;Tin升高,所有燃料主燃烧着火时刻提前,缸内最大爆发压力和燃烧效率升高,HCCI正常运转工况范围向小负荷区域拓展,但Tin对指示效率的影响与燃料的RON有关。排放测试表明,Tin升高,所有燃料的HC和CO排放均降低,Tin较高时,燃料特性对两者的影响减小;Tin高于363 K时,汽油的HC和CO排放均最低;Tin和RON都相同,汽油燃料的NOx排放值相对较高,Tin对所有燃料的NOx排放的影响均不明显。Bench test was carried out on a modified four-cylinder diesel engine fueled with the primary reference fuel（PRF） , gasoline and the oxygenated fuels with different octane number. The effects of fuel property on the combustion characteristics, operating region and emission characteristics of the homogeneous charge compression ignition（HCCI） at various intake temperatures were made. The results show that, the PRF fuel shows the earliest ignition timing and the highest value in cylinder pressure and heat release rate when intake temperature is low, following by gasoline and the oxygenated fuels. Gasoline gives the earliest ignition timing and the highest value in combustion efficiency and indicated thermal efficiency when the intake temperature is high. With the increase of intake temperature, the ignition delay shows decreasing for all fuels, along with the increase of the maximum cylinder pressure and the combustion efficiency. HCCI operating region can be extended to the low load area while the effect of intake temperature on the indicated efficiency is related to the RON of the fuel. Emission results show that HC and CO emissions for all fu- els will decrease with the increase of intake temperature, but the effect from fuel property on emissions becomes small at high intake temperature. HC and CO emissions of gasoline give the lowest values at intake temperature over 363 K. For the specific intake temperature and RON, gasoline gives the highest value in NOx emissions. The effect of intake temperature on NOx emissions is unobvious for all fuels.

关 键 词：均质压燃 燃料特性 进气加热 

分 类 号：TK431[动力工程及工程热物理—动力机械及工程]