添加乙醇燃料对汽油机起动过程微粒排放的影响  

Influence of Ethanol-gasoline Blended Fuels on Gasoline Engine Particulate Emission During Start

作　　者：袁超[1,3] 洪伟 苏岩[1,2] 解方喜[1,2] 陈静[4] Yuan Chao;Hong Wei;Su Yan;Xie Fangxi;Chen Jing(Jilin University,State Key Laboratory of Automotive Simulation and Control,Changchun 130025;College of Automotive Engineering,Jilin University,Changchun 130025;FAW Foundry Co.,Ltd.,Changchun 130062;Jiangxi Isuzu Motors Co.,Ltd.,Nanchang 330100)

机构地区：[1]吉林大学,汽车仿真与控制国家重点实验室,长春130025 [2]吉林大学汽车工程学院,长春130025 [3]一汽铸造有限公司,长春130062 [4]江西五十铃发动机有限公司,南昌330100

出　　处：《汽车工程》2018年第12期1393-1397,1425,共6页Automotive Engineering

基　　金：国家自然科学基金(51276080);吉林省科技发展计划项目(20170101131JC)资助。

摘　　要：为研究乙醇燃料的添加对直喷汽油机起动过程中微粒排放的影响,通过在汽油中添加体积百分比为10%和20%的乙醇得到E10和E20燃料,采用这两种燃料和汽油燃料对直喷汽油机起动过程的微粒排放进行了研究。结果表明:在起动前10s初始阶段,不论燃用哪一种燃料,排气中微粒数量浓度都会急剧增加,是核态和积聚态两种形态微粒共同作用的结果,而起动过程中微粒数量浓度排放始终以核态为主;随着冷却液温度升高,积聚态微粒数量会大幅度降低;汽油中添加一定数量的乙醇,可以改善在起动工况下的核态微粒排放;燃用E20燃料在20和80℃条件下起动40s内微粒数量总浓度分别降低了37. 8%和64. 5%。In order to investigate the effect of ethanol addition on gasoline direct injection engine particulate emission during the starting period,E10 and E20 fuels are obtained by blending 10% and 20% volume fraction ethanol fuel into gasoline. With the two fuels and gasoline fuel,study of particulate emission from GDI engine during the starting period is conducted. It is found that particle number concentration increases dramatically during the first10 seconds of the initial starting period with each fuel,which is due to increase of both nuclear mode and accumulated mode particles. The particulate emission is dominated by nuclear mode particles. As the temperature of the coolant increases,the amount of accumulated particles decreases dramatically. Adding a certain amount of ethanol to gasoline can improve the emission of nuclear mode particles under the start condition. The total concentration of particulates reduces by 37. 8% and 64. 5% during 40 s starting period respectively,at 20 and 80℃ with E20 fuel.

关 键 词：直喷汽油机 乙醇 微粒 起动 排放 

分 类 号：U464.171[机械工程—车辆工程]