某型发动机排气歧管热应力分析

Analysis on the Thermal-Stress of Exhaust Manifold of an Engine

对某型发动机排气歧管在高温废气作用下的热应力进行计算。首先计算其流场的温度场数据,并将在流固交界面处的温度和换热系数作为载荷加载到固体表面上,最后计算固体温度场和热应力。热应力计算结果对于改进排气歧管结构和提高排气歧管质量具有一定的参考价值。

Calculation is made of thermal stress of the exhaust manifold of an engine under high exhaust temperature. Firstly, temperature field in the flow field is calculated. Then the temperature in the interface of fluid and solid and heat exchange coefficient are added to the solid surface as load. Finally, solid temperature field and thermal stress is calculated. The result of thermal stress calculation can be reference for improving the structure and quality of the exhaust manifold.