醇类燃料点火提前角对汽油机性能和排放的影响  

Effects of Ignition Timing on Alcohol-gasoline Blends Fuelled SI Engine Performance and Emissions

作　　者：魏衍举[1] 吴刚[1] 陈岳[1] 刘圣华[1] 

机构地区：[1]西安交通大学汽车工程系

出　　处：《农业机械学报》2008年第1期33-36,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家“973”重点基础研究发展计划资助项目(项目编号:2001CB209206)

摘　　要：通过旋转分电器外壳改变点火提前角来研究其对燃用M20甲醇-汽油和E20乙醇汽油(甲醇、乙醇体积分数均为20%)混合燃料电喷汽油机的性能和排放的影响。试验结果表明:汽油机燃用M20和E20时最高压力点比纯汽油分别提前1°CA(曲轴转角)和0.5°CA,最佳点火提前角分别提前约2°CA和1°CA;随着点火提前角的增大,燃用2种燃料的汽油机性能和排放变化趋势相似,均表现为扭矩和功率增大,能量消耗率降低,CO、HC和NOx排放量增加。Changing the advanced ignition angle by rotating the distributor housing, the effects of ignition timing on M20 and E20（20% methanol and ethanol by volume）alcohol-gasoline blends fuelled SI engine performance and exhaust emissions were experimentally investigated. The experimental results show that, compared with gasoline, M20 and E20 fuel blends advance the maximum burning pressure point by 1°CA （crank angle） and 0.5°CA, and the optimal ignition timing by about 2°CA and 1°CA respectively. The effects of ignition timing on engine power, fuel economy and exhaust emissions characteristics of two blends are similar. With the advance of ignition timing, engine power and brake torque increase, brake-specific energy consumption （BSEC, Bsec） decreases and the thermal efficiency is improved, however, CO, HC and NOx emissions are enhanced.

关 键 词：汽油机 性能 排放 点火提前角 醇类燃料 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程] TK411