进气歧管结构差异对发动机各缸EGR率均匀性的影响  

The influence of different intake pipe structures on the uniformity of EGR rates in each cylinder of the engine

作　　者：邓彪 DENG Biao(Shanghai New Power Automotive Technology Co.,Ltd.,Shanghai 200438,China)

机构地区：[1]上海新动力汽车科技股份有限公司,上海200438

出　　处：《柴油机设计与制造》2023年第4期23-27,共5页Design and Manufacture of Diesel Engine

摘　　要：针对天然气发动机,废气再循环(EGR)能够有效地有抑制氮氧化物(NOx)的产生,同时降低发动机缸内的燃烧温度。但各缸EGR率差异会导致各缸燃烧存在差异,从而增加失火和爆燃的风险。基于某国六天然气发动机进行各缸EGR率测试,并对进气歧管进行计算流体动力学(CFD)仿真分析。基于此,通过优化进气歧管结构设计,有效提升了EGR率的均匀性,各缸EGR率均匀性≤2.5%,满足设计要求。研究结果可为后期发动机的进气歧管设计开发提供参考。For natural gas engines,exhaust gas recirculation(EGR)can effectively suppress the generation of nitrogen oxides(NOx)while reducing the combustion temperature in the engine cylinder.However,differences in EGR rates among cylinders can lead to differences in combustion,thereby in⁃creasing the risk of misfire and detonation.EGR rate tests on each cylinder and computational fluid dy⁃namics(CFD)simulation analysis of the intake pipeline were conducted based on a ChinaⅥnatural gas engine.By optimizing the structural design of the intake pipeline,the uniformity of the EGR rate was ef⁃fectively improved.The uniformity of EGR rate in each cylinder was≤2.5%,which meets the design re⁃quirements and can provide reference for the design and development of intake pipes in engines.

关 键 词：天然气发动机 废气再循环率 计算流体动力学 仿真 均匀性 

分 类 号：TK46[动力工程及工程热物理—动力机械及工程]