汽油/压缩天然气两用燃料发动机颗粒物排放特性研究  

Particulate Matter Emission Characteristics of Gasoline/Compressed Natural Gas Dual-Fuel Engine

作　　者：侯献军[1,2,3] 熊纳 王友恒 刘志恩[1,2,3] HOU Xianjun;XIONG Na;WANG Youheng;LIU Zhien(Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University ofTechnology,Wuhan 430070,China;Hubei Collaborative Innovation Center for Automotive ComponentsTechnology,Wuhan University of Technology,Wuhan 430070,China;Hubei Research Center forNew Energy&Intelligent Connected Vehicle,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学现代汽车零部件技术湖北省重点试验室,武汉430070 [2]武汉理工大学汽车零部件技术湖北省协同创新中心,武汉430070 [3]武汉理工大学湖北省新能源与智能网联车工程技术中心,武汉430070

出　　处：《内燃机工程》2021年第3期74-80,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家重点研发计划项目(2018YFB0106401)。

摘　　要：在某款1.4 L自然吸气两用燃料发动机上进行台架试验,用DMS500快速颗粒分析仪在发动机转速为4000 r/min不同进气压力工况下,对汽油和压缩天然气(compressed natural gas,CNG)的颗粒物排放特性进行采样分析。试验结果表明,两种燃料的总体颗粒物数量(particle number,PN)和颗粒物质量(particle mass,PM)浓度均随进气压力的增大呈先减小后增大的趋势。不同进气压力下CNG的PN和PM排放较为稳定,PN中核态颗粒物占比较大,在粒径约200 nm处颗粒物表面积浓度出现峰值。燃用汽油的排放颗粒物中积聚态占主导,因而其PM浓度比燃用CNG的大,其颗粒物的表面积浓度也更大,最大表面积浓度出现在颗径约100 nm处。The engine bench test was carried out on a 1.4 L naturally aspirated dual-fuel engine,and the particulate matter emission characteristics of two fuels,gasoline and compressed natural gas(CNG),were sampled and analyzed by DMS500 fast particle analyzer under different inlet pressure conditions with engine speed of 4000 r/min.The experimental results show that the total particle number(PN)and particle mass(PM)concentrations of the two kinds of fuel decrease first and then increase with the increase of inlet pressure.The PN and PM emission of CNG are relatively stable under different inlet pressures.The nuclear particles in the PN account for a relatively large amount.At a particle size of about 200 nm,the particle surface area concentration appears a peak.The accumulation state of gasoline emission particulate matter is dominant,so its PM concentration is greater than that of CNG,and its particulate matter surface area concentration is also greater,with the maximum surface area concentration appearing at about the particle size of 100 nm.

关 键 词：两用燃料发动机 压缩天然气 颗粒物 排放 粒径分布 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]