4缸柴油机排气歧管分析与设计的研究  

A Study on the Analysis and Design of Exhaust Manifold in a Four-cylinder Diesel Engine

作　　者：龚金科[1] 官庆武[1] 

机构地区：[1]湖南大学,汽车车身先进设计制造国家重点实验室,长沙410082

出　　处：《汽车工程》2013年第4期354-357,共4页Automotive Engineering

基　　金：国家自然科学基金(50876027);863项目(2008AA11A116);湖南省自然科学基金(10JJ6080)资助

摘　　要：对增压柴油机的涡轮进气口布置方案进行了分析,建立了某型4缸增压柴油机的一维仿真模型,并通过仿真,对不同布置方案的柴油机进行了性能对比分析。接着,基于对排气歧管局部流动损失的分析,设计了一种新的排气歧管,建立了新、旧两种排气歧管的CFD三维仿真模型,并对其流场特性进行了仿真。结果表明,所设计的排气歧管能更好地满足柴油机特性的要求。The layout schemes of turbine inlet for turbocharged diesel engine are analyzed, a one-dimensional simulation model for a four-cylinder turbocharged diesel engine is built, and the performances of diesel engine with two different inlet layouts are compared by simulation. Then a new exhaust manifold is designed based on the analysis on its local flow losses, CFD 3D simulation models for both new and original exhaust manifolds are set up, and a simulation on their flow characteristics is performed. The results show that the new manifold designed can better meet the requirements of diesel engine characteristics.

关 键 词：柴油机 排气歧管 布置方案 流场 

分 类 号：U464.172[机械工程—车辆工程]