摘要
针对甲醇发动机冷起动醇醛类排放物高的问题,基于一款经柴油机改装的缸内直喷点燃式甲醇发动机为模型,采用AVL-FIRE软件耦合甲醇氧化反应机理,分析了不同进气温度对甲醇发动机冷起动燃烧、甲醛和未燃甲醇排放的影响,结果表明,当进气温度由283 K提高到293 K,燃烧滞燃期缩短了1.3°CA,最高气缸压力和最高燃烧温度分别升高0.59MPa和165 K,未燃甲醇和甲醛排放浓度下降幅度分别为49%和32%;当进气温度由293 K升高到313 K,提高进气温度对改善燃烧和降低醇醛排放作用有一定程度下降;当进气温度超过313 K提高进气温度对改善燃烧和降低醇醛排放效果微弱。提高进气温度能够促进缸内甲醇的蒸发,改善缸内混合气浓度分布和冷起动燃烧,降低甲醛和未燃甲醇排放。
To analyze the cause of high unregulated emission of alcohol aldehyde of methanol engine during cold starting,the effect of different intake temperatures on combustion and formaldehyde and unburned methanol unregulated emission of a direct injection spark ignition methanol engine refitted from diesel engine during cold starting was simulated by using AVL-FIRE coupling methanol chemical kinetics reaction mechanism.The research results show that,when intake temperature is increased from 283 K to 293 K,the ignition delay is reduced by 1.3°CA,and the maximum in-cylinder pressure and combustion temperature is increased by 0.59 MPa and 165 K,concentration of unburned methanol and formaldehyde emission is reduced by 49% and 32%,respectively;when the intake temperature further is increased from 293 K to 313 K,the effect of increasing intake temperature on combustion and unregulated emission decreases;while it plays little role improving combustion and reduce unregulated emissions when the intake temperature exceeds 313 K.Improving intake temperature can accelerate evaporation of methanol inside cylinder,improve distribution of in-cylinder gas mixture concentration and cold start burning,reduce emission of formaldehyde and unburned methanol.
作者
宫宝利
彭乐高
宫长明
孙景震
张成博
Gong Baoli;Peng Legao;Gong Changming;Sun Jingzhen;Zhang Chengbo(China Automotive Engineering Research Institute Co.,Ltd,Chongqing 401122;Dongfeng Nissan Technical Cente,Guangzhou 510640;Chongqing Key Laboratory of Vehicle Emission and Energy Saving,Chongqing 401122;Dalian Minzu University,Dalian 116600;State Key Laboratory of Automotive Simulation and Control,Jilin university,Changchun 130025;Dongfeng Motor Corporation Technical Center,Wuhan 430056)
出处
《汽车技术》
CSCD
北大核心
2019年第1期43-47,共5页
Automobile Technology
基金
国家自然科学基金资助项目(51176063)
中央高校基本科研业务费专项资金资助项目(DC201502010203)
关键词
点燃式甲醇发动机
冷起动
燃烧
排放
进气温度
Spark-ignition methanol engine
Cold start
Combustion
emissions
Intake temperature
