热载荷对止口连接结构过盈量的影响分析

针对工作状态下航空发动机止口连接结构工作可靠性问题,开展了不均匀温度场下止口连接结构过盈量变化的研究。建立了止口结构简化模型,基于热弹性力学理论,利用平衡微分方程、物理方程和几何方程,推导出不均匀温度场下止口过盈量变化的计算式;通过算例进行理论计算,结合有限元软件对计算结果进行仿真对比。结果表明:在一定温度场下,航空发动机止口连接结构实际过盈量理论损失高达63%,设计时应加以补偿。所得结论可为止口连接结构过盈量设计提供理论依据。

Effect Analysis of Thermal Load on Interference Amount of Rabbet Joint Structure

In order to solve the reliability problem of aeroengine rabbet joint structure under working condition,a study on the change of the interference amount of the rabbet joint structure was carried out under non-uniform temperature field. The simplified model of the rabbet joint structure was established. Equilibrium differential equation,physical equation and geometric equation were analysed based on thermoelastic theory. The formula for calculating the change of the rabbet interference amount was derived under the non -uniform temperature field. The theoretical calculation was carried out through an example,and the simulation results were compared with the finite element software. The results show that under certain temperature field,the theoretical loss of actual interference amount of aeroengine rabbet joint structure is as high as 63%,which should be compensated in design. The conclusion obtained can provide the theoretical basis for the design of the interference amount of the rabbet joint structure.