进气富氧对直喷柴油机微粒排放粒径分布的影响  

Effect of Intake Oxygen Enrichment on Particle Size Distribution from a DI Diesel Engine

作　　者：舒歌群[1] 徐彪[1] 张韦[1,2] 赵伟[1] 董立辉[1] 王月森[1] 杨康[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]昆明理工大学交通工程学院,昆明650500

出　　处：《天津大学学报（自然科学与工程技术版）》2014年第8期659-664,共6页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(50976077)

摘　　要：在一台增压中冷四冲程柴油机上进行进气富氧燃烧台架实验,用氧气流量阀和氧传感器控制进气氧浓度,用DMS500粒径分析仪检测排气粒径分布特性,研究进气富氧燃烧对柴油机排气微粒特性的影响.在稳态工况下,研究了进气氧体积分数分别为21%、22%、23%和24%时柴油机微粒排放质量浓度粒径分布、数量浓度粒径分布、几何平均直径、表面积浓度和体积浓度分布.实验结果表明:在固定工况下,随着进气氧浓度增加,积聚态微粒数量和质量浓度峰值明显降低,核态微粒数量浓度逐渐增加;微粒几何平均直径减小,小粒径微粒数量增多;微粒表面积浓度和体积浓度也随之降低.The characteristics of particle size distribution in the exhaust gas of a four-cylinder turbo-charged diesel engine were studied.The oxygen concentration of the intake air was controlled by flow valve and oxygen sensor.Particle size distributions were measured with a fast particle analyzer（DMS500）.Particulate matter number concentration,size distribution characteristics,geometric mean diameter（GMD）,surface area distribution and volume distribution were studied with the intake oxygen concetration at 21％,22％,23％ and 24％ under steady-state engine operating conditions.The results indicated that,under the same operation condition,the peak values of accumulative particulate matter number and mass concentration decrease with the increase of the intake oxygen volume; also particulate geometry mean diameter,surface area density and particle volume density decrease while the nuclei mode particle number concentration and small-diameter particles show a slight increase.

关 键 词：柴油机 进气富氧 微粒排放 粒径分布 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]