某增压发动机排气热端耐久性分析与优化  

Durability Analysis and Optimization on the Exhaust Hot End of a Turbocharged Gasoline Engine

作　　者：李相旺[1] 黄凤琴[1] 张志明[1] 何宝俊 邹雄才 张文龙[1] 王伟民[1] 

机构地区：[1]东风汽车公司技术中心,武汉430058

出　　处：《汽车工程》2017年第10期1130-1135,共6页Automotive Engineering

摘　　要：某增压汽油机中,排气歧管的隔板倒角与颈部和催化器的壳体都出现开裂。通过仿真分析和对比试验发现,隔板倒角和颈部热应力过大是造成开裂的主要原因,而排气歧管1阶模态频率过低是催化器壳体开裂的主要原因。通过增大隔板处圆角并增加隔板厚度解决了隔板开裂问题,在颈部加筋解决了颈部开裂问题,而通过优化支架并另外增加固定支架提高排气歧管1阶模态频率解决了催化器壳体开裂问题。通过这些问题的分析和解决,积累了排气歧管的仿真、设计和测试经验。Cracks appear at the baffle fillet and neck of exhaust manifold and the housing of catalytic con-verter in a turbocharged gasoline engine. It is revealed by simulation and comparative test that the main cause of the cracks at the baffle fillet and neck of exhaust manifold is high thermal stress,while the 1st-order modal frequency is too low,which results in the crack of catalytic converter housing. The crack problem at manifold baffle is solved by increasing its fillet and thickness while that at neck is solved by adding rib. As for the crack of catalytic converter housing,the solution are optimizing bracket and adding another fixed bracket to increase its 1st-order modal fre-quency. In the process of analyzing and solving these crack problems,some experiences are accumulated regarding the simulation, design,test and measurement of exhaust manifold.

关 键 词：发动机 排气热端 开裂 仿真 1阶模态 优化 

分 类 号：U464.134.4[机械工程—车辆工程]