喷油时刻和EGR对Diesel/MF混合燃料燃烧和排放的影响  

Effects of Fuel Injection Timing and Exhaust Gas Recirculation on Combustion and Emissions of Diesel/MF Blends

作　　者：肖合林[1,2] 王儒 曾鹏飞[1,2] 侯贝贝[1,2] Xiao Helin, Wang Ru, Zeng Pengfei, Hou Beibei(1. Wuhan University of Technology, Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan 430070,2. Wuhan University of Technology,Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 43007)

机构地区：[1]武汉理工大学现代汽车零部件技术湖北省重点实验室,武汉430070 [2]武汉理工大学汽车零部件技术湖北省协同创新中心,武汉430070

出　　处：《汽车工程》2018年第7期777-782,794,共7页Automotive Engineering

基　　金：国家自然科学基金(21377101)资助

摘　　要：在一台压燃式发动机上,进行了燃用2-甲基呋喃(MF)及其与柴油混合燃料的发动机燃烧和排放特性的试验研究。结果表明:喷油时刻接近上止点时,缸内压力峰值降低,废气再循环可明显降低缸内峰值压力和放热率;喷油时刻提前CO排放降低;推迟喷油和采用废气再循环(EGR)可明显降低NOx排放;混合燃料可以明显降低碳烟排放;相同的喷油时刻下,废气再循环对小颗粒的影响较小,对大颗粒的影响较大;喷油时刻越靠近上止点,废气再循环对颗粒数量浓度的影响越大;喷油时刻早于上止点前12.5°CA时,在废气再循环的影响下,大颗粒物数量增多,颗粒物质量浓度也随之增大。An experimental study is conducted on the combustion and emission characteristics of a compression ignition engine fueled with 2-methylfuran（ MF） and its blend with diesel fuel. The results show that in-cylinder pressure peak lowers when injection timing is close to top dead center（ TDC） and the adoption of exhaust gas recirculation（ EGR） can obviously reduce in-cylinder pressure peak and heat release rate. The advance of injection reduces CO emission while the retard of injection and the adoption of EGR can apparently lower NOxemission,and the use of MF-diesel blend fuel can significantly reduce soot emission. Under the same injection timing,the effects of EGR on larger particulates are more significant than that on small ones. The effects of EGR on the number concentration of particulates become larger when injection timing is closer to TDC,and under the effects of EGR,the number of large particulates increases and the mass concentration of particulates rises accordingly when injection timing is earlier than 12. 5°CA BTDC.

关 键 词：2-甲基呋喃(MF) 喷油正时 废气再循环(EGR) 燃烧 排放 颗粒物 

分 类 号：U464[机械工程—车辆工程]