排气门正时对高比例甲醇-汽油混合燃料燃烧和排放的影响研究  

Effect of Exhaust Valve Timing on Combustion and Emissions of High Proportional Methanol-Gasoline Blends

作　　者：宫艳峰 钱丁超 马赫阳 刘铭礼 解方喜[2] 孟祥龙 GONG Yanfeng;QIAN Dingchao;MA Heyang;LIU Mingli;XIE Fangxi;MENG Xianglong(FAW Research and Development Institute,Changchun 130000,China;State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130025,China)

机构地区：[1]中国第一汽车股份有限公司研发总院,吉林长春130000 [2]吉林大学汽车仿真与控制国家重点实验室,吉林长春130025

出　　处：《车用发动机》2025年第1期12-17,26,共7页Vehicle Engine

基　　金：长春市国家重点实验室重大专项(23G2220);吉林大学科技成果概念验证项目任务书(2023GN015);吉林省长春市重大科技专项课题(20230301001ZD)。

摘　　要：采用自行开发的可变气门机构,在高压缩比点燃式发动机上进行了试验,研究了排气门正时对高甲醇掺烧比甲醇-汽油发动机燃烧和性能的影响。结果发现:提前排气门正时会使燃烧开始时刻(CA5)滞后,燃烧持续期延长,结合点火正时后,燃烧相位得到改善;在排气门正时结合最佳点火正时下,等效有效比油耗(b e)和NO x排放都得到明显改善,在最佳点火正时下,排气门正时前移可以使M50,M75和M100的最佳b e分别降低7.39%,11.06%和18.72%,NO x排放量分别降低34.5%,19.6%和23.9%;提高甲醇添加量可以提高经济性,降低HC排放量。The experiment was conducted on a high-compression ratio spark-ignition engine by using a self-developed variable valve mechanism and the effect of exhaust valve timing on the combustion and performance of methanol/gasoline engines with high volume methanol content was studied.It was found that early timing of exhaust valve would cause CA5 to lag and prolong the combustion duration.Combined with optimal ignition timing,the combustion phase improved.Under the combination of exhaust valve timing and optimal ignition timing,both b e and NO x emissions significantly improved.Under the optimal ignition timing,shifting the exhaust valve timing forward could reduce the optimal b e of M50,M75,and M100 by 7.39%,11.06%,and 18.72%respectively and NO x emissions by 34.5%,19.6%,and 23.9%respectively.Increasing the amount of methanol could also improve fuel economy and reduce HC emissions.

关 键 词：排气门正时 甲醇 汽油 双燃料发动机 燃油经济性 排放 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]