柴油机排气管结构对性能影响研究  

Study on the Influence of Exhaust Pipe Structure on Performance of Diesel Engine

作　　者：李洪波 张洋洋 孙放 张福根 付永刚 吴永强 王建光 LI Hongbo;ZHANG Yangyang;SUN Fang;ZHANG Fugen;FU Yonggang;WU Yongqiang;WANG Jianguang(Weichai Power Co.,Ltd.,Weifang 26100,China)

机构地区：[1]潍柴动力股份有限公司,山东潍坊261061

出　　处：《内燃机》2023年第6期23-29,共7页Internal Combustion Engines

基　　金：国家重点研发计划项目(2017YFC0211305)。

摘　　要：以某高压共轨柴油机为例,通过仿真和试验方法研究了两种不同结构的排气管对柴油机性能的影响。研究发现,安装连通式排气管的柴油机在燃油消耗率、涡前排温、增压器转速等性能参数方面均表现出优势,尤其在额定工况下,与安装分段式排气管的柴油机相比,其燃油消耗率降低了3%,增压器转速降低了4%,涡前排温降低了4.5%。所有性能参数均满足设计要求,而分段式排气管柴油机的额定点的实际燃油消耗率和增压器转速未能达到设计要求。综合分析结果表明,柴油机需要安装连通式排气管。对比仿真数据和试验结果,偏差在3%以内,仿真精度满足要求,因此可以使用仿真模型进行排气管结构参数的优化研究。Taking a high pressure common rail diesel engine as an example,the effects of two different exhaust pipes on the performance of the diesel engine are studied by simulation and test methods.Through the study,it is found that the fuel consumption rate,exhaust temperature in front of turbine and turbocharger speed of diesel engines installed with connected exhaust pipes are lower than those installed with sectional exhaust pipes,especially under rated working conditions,the fuel consumption rate and turbocharger speed of diesel engines installed with connected exhaust pipes are reduced by 3%and 4%,and the vortex front temperature is reduced by 4.3%,All the performance parameters meet the design requirements.But the actual fuel consumption and supercharger speed of segmented exhaust diesel engine under rated working conditions can not meet the design requirements,comprehensive analysis,diesel engine needs to install connected exhaust pipe.Compared with the simulation and test results,the deviation is less than 3%,the simulation accuracy meets the requirements,and the simulation model can be used to optimize the structural parameters of the exhaust pipe.

关 键 词：柴油机 排气管结构 连通式排气管 分段式排气管 仿真 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]