摘要
针对某涡桨发动机在试车过程中发生的自由涡轮叶片裂纹故障,对裂纹叶片进行荧光检查、叶片测频和冶金分析,并通过MSC/PATRAN有限元分析软件确定叶片的振动特性。结果表明:叶片裂纹发生的原因为叶片的第5阶固有频率与导叶激励频率接近而发生共振,引起叶片发生高阶振动,造成叶片高周疲劳失效所致。重点调整螺旋桨的工作转速范围,使其基本处于规定的安全工作转速范围内。后经1000 h试车验证,均未再发生类似故障。
In view of the blade crack fault of free turbine occurred during a turboprop engine test run,the crack blade was examinedby fluorescence,frequency measurement and metallurgical analysis,and the vibration characteristics of the blade were determined by MSC/PATRAN Finite Element analysis software. The results show that the cause of the blade crack is that the fifth natural frequency of the bladeis close to the excitation frequency of the guide vane, which causes the blade to vibrate at higher order and causes the high cycle fatiguefailure of the blade. The working speed range of propeller is mainly adjusted to make it within the specified safe working speed range. After1000 h test run,none of the same faults occurred again.
作者
马利丽
何立强
任伟峰
MA Li-li1, HE Li-qiang1, REN Wei-feng2(1.Aero EngineCorporation of China,Beijing 100097,China;2.AECCHunan PowerplantResearch Institute,ZhuzhouHunan 412002,China)
出处
《航空发动机》
北大核心
2018年第6期54-58,共5页
Aeroengine
基金
航空动力基础研究项目资助
关键词
自由涡轮叶片
裂纹
振动
共振
高周疲劳
涡桨发动机
free turbine blade
crack
vibration
resonance
high cycle fatigue
turboprop engine
