基于接触式高温应变测试试验的涡轮叶片强度分析

基于涡轮叶片实际工况,建立了热-流-固耦合有限元仿真模型,得到了涡轮叶片的温度场、压力场、应力场与应变场。开展了涡轮叶片强度测试试验,试验中根据温度场仿真结果,通过感应加热装置对叶片加热;根据叶片转速计算等效离心载荷,通过液压拉伸试验机对叶片施加等效载荷。基于接触式高温应变测试方法开展了叶片静态应变测量,并通过测量结果与仿真结果的对比,验证了测试方法在涡轮叶片静态高温应变测量中的可行性。

Strength analysis of turbine blade based on contact high temperature strain test experiment

The thermal-fluid-solid coupling finite element simulation model was established based on the actual working condition of turbine blade,and the fields of temperature,pressure stress and strain were ob⁃tained.The strength test of turbine blade was conducted,and the blade was heated by the induction heating device according to the simulated temperature field result.Being calculated based on the blade rotation speed,the equivalent load was applied to the blade by a hydraulic tensile testing machine.The static strain of blade was tested through the contact high temperature strain measurement method,and the test result was verified by comparison between simulation and calculation results,which demonstrated the feasibility of the measurement method in the static high temperature strain measurement.