稳态温度场作用下涡轮叶片的可靠性分析

采用蒙特卡罗仿真方法对某型发动机第一级涡轮转子叶片进行可靠性分析，考虑了稳定工作条件下稳态温度场对涡轮叶片的影响，忽略振动载荷及气动载荷。根据场序热一结构耦合方法对涡轮叶片进行了确定性热应力分析，然后通过大量蒙特卡罗仿真试验对涡轮叶片应力的概率分布进行了分析求解，求解过程中采用了模型数据文件与温度载荷数据文件循环调用的方法，对影响涡轮叶片应力状况的随机因素进行了灵敏度分析。以不考虑温度场情况下的分析作为对比参照，根据对比发现在温度场作用下涡轮叶片材料弹性模量的分散性对叶片可靠性较常温状况下有较大的影响，且常温状况下叶片可靠度的计算结果偏高。

Reliability analysis of turbine blade under steady-state thermal field

Reliability analysis is conducted of turbine blade with Monte Carlo Simulation （MCS）, taking into account the influence of steady-state thermal field on turbin blade while neglecting vibrational load and aerodynamic load. Deterministic thermal stress analysis of turbine blade is carded out with thermal-structure sequential coupling, then probability distribution of stress is analyzed with a large number of Monte Carlo simulations. Cyclic call of model data file and temperature load data file is adopted in the solution proce- dure, to conduct sensitivity analysis of the factors affecting the stress of turbine blade. Results show that dis- persion of elastic modulus under thermal field has a greater effect on the reliability of the turbine blade than under normal temperature condition, and the result of reliability under normal temperature condition is higher.