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    • Research on the Influence of Combustion System Parameters on the Combustion and Emission Characteristics of Commercial Vehicle Engines
    DOI：10.13949/j.cnki.nrjgc.2024.02.007
    Key Words:commercial vehicle  combustion system  combustion chamber  fuel injection parameter  combustion characteristic  emission characteristic
    Author NameAffiliationE-mail
    LEI Jilin Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China leijilin@sina.com 
    LI Zhenzhuo Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 1963106790@qq.com 
    LIU Yi* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China lqyi@kust.edu.cn 
    WANG Weichao Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 287692950@qq.com 
    SONG Guofu Kunming Yunnei Power Corporation Limited， Kunming 650224， China songguofu0812@foxmail.com 
    ZHANG Haifeng Kunming Yunnei Power Corporation Limited， Kunming 650224， China Yn_zhanghaifeng@sina.com 
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    Abstract:In order to improve the performance of commercial vehicle engines， four new schemes were designed for the structural parameters of the combustion chamber of a commercial vehicle by using computational fluid dynamics（CFD） simulation， orthogonal design， and other methods. Three injection parameters， including oil beam angle， the angle of the spray cone and main spray timing， were selected to carry out a multi-factor impact study. The results show that scheme 1， where the shape curve of the combustion chamber contracts inward and the maximum radius increases， can enhance the turbulent characteristics in the cylinder， improve the distribution of fuel concentration， accelerate combustion speed， and achieve better fuel gas mixing， making it the optimal scheme. In the research of fuel injection parameters， when the soot emission is taken as the optimization index， the oil beam angle has the greatest impact on the emission characteristics. The optimal matching scheme is that the oil beam angle is 147°， the angle of the spray cone is 15°， and main spray timing is -1°. Its in-cylinder soot emissions are 13.91% lower than those of the original engine， and NOx emissions are 13.98% lower than those of the original engine. When the NOx emission is taken as the optimization index， the main spray timing has the greatest impact on the emission characteristics. The optimal matching scheme is that the oil beam angle is 160°， the angle of the spray cone is 25°， and the main spray timing is -1°. The NOx emissions in the cylinder are 37.79% lower than that of the original engine.
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