基于遥测技术的发动机涡轮转子叶片动应力测量

摘要

根据某型发动机涡轮叶片动应力测量试验要求，提出了一种基于遥测技术的高温动应力测量系统方案，并重点介绍了测量系统组成、工作原理及系统标定。利用该测量系统，成功获取了发动机涡轮叶片动应力数据。整个试验过程中，遥测系统工作正常，表现出良好的冷却效果、电源稳定性和信号频率跟随性。试验结果表明，该型发动机在特定转速区间内存在窄频带共振，振幅水平较高，具有明显的破坏性，结果可信。%To meet the aero-engine test requirements, a measurement system of dynamic stress of turbine rotor blades using telemetry in high temperature environment was introduced. System composition, princi⁃ple of operation and system calibration were presented. The blade dynamic stress data were obtained suc⁃cessfully by test, in the course of which, the telemetry system worked well with good cooling effect, stable power output and perfect ability of frequency track. The test results show that the engine has a narrow reso⁃nant frequency band and high level amplitude in a certain range of rotation speed, which is obvious damag⁃ing to the engine structure. The test results is believable.