侯献军，熊纳，王友恒，刘志恩.汽油/压缩天然气两用燃料发动机颗粒物排放特性研究[J].内燃机工程,2021,42(3):74-80.
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
DOI：10.13949/j.cnki.nrjgc.2021.03.011
关键词:两用燃料发动机  压缩天然气  颗粒物  排放  粒径分布
Key Words:dual-fuel engine  compressed natural gas(CNG)  particulate matter  emission  particle diameter distribution
基金项目:国家重点研发计划项目(2018YFB0106401)
作者单位
侯献军，熊纳，王友恒，刘志恩 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 
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摘要:在某款1.4L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4000r/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200nm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100nm处。
Abstract:The engine bench test was carried out on a 1.4L 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 4000r/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 200nm, 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 100nm.
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