某型APU燃烧室热应力分析

Thermal Stress Analysis of an APU Combustion Chamber

为了分析某型APU燃烧室实际维修部件故障产生原因,利用ANSYS软件建立构件“流-固”耦合模型,探究高温工况下热应力对构件产生损伤的影响。结果表明:稳态工作状态下,燃烧室内部排气孔位置最高温度达到1187.87℃,承受Von-Mises应力为784.91 MPa;将仿真结果与实际维修数据比对,仿真分析得出的受载严重位置与实际服役燃烧室损伤位置基本一致,因此得出,由于燃烧室内环冷却孔承受较大温度梯度,更易发生故障损伤,造成经济损失乃至产生安全问题。研究结果可为APU燃烧室构件的定期检修以及计算其疲劳寿命提供依据。

In order to analyze the cause of the failure of the actual repair parts of an APU combustion chamber,the fluid-solid coupling model of the component is established by using ANSYS software to study the influence of thermal stress on the damage of the component under high temperature conditions.The results show that the maximum temperature of the exhaust hole in the combustion chamber reaches 1187.87℃ and the Von-Mises stress is 784.91 MPa under steady-state working conditions.The simulation results are compared with the actual maintenance data,and the severely loaded positions obtained by the simulation analysis are basically consistent with the actual service combustion chamber damage position,so it is concluded that due to the cooling holes in the inner ring of the combustion chamber bear a large temperature gradient,failures and damages are more likely to occur,causing economic losses and even security problems.The research results can provide a basis for the regular maintenance of APU combustion chamber components and the calculation of their fatigue life.