摘要
为验证某型真实带冠涡轮叶片叶冠干摩擦阻尼减振效果,本文建立了可实现正压力连续调节的非旋转状态涡轮叶片试验系统,对不同接触紧度、不同接触角度的真实带冠涡轮叶片的振动响应进行了测试。通过试验分析了叶冠接触面紧度、接触角度等重要参数对带冠叶片振动特性和减振效果的影响规律,结果表明:带冠涡轮叶片出现了明显的非线性现象,同时存在一个最优的接触紧度使得该带冠涡轮叶片的减振效果最佳,接触角度的选取应综合考虑叶冠振动能量的消耗能力和带冠涡轮叶片共振频率的稳定性。
In order to test the effect of dry friction damping of the real shrouded turbine blades, a testing system is set up to measure dynamic response of non-rotating shrouded turbine blades, by which the loading scheme can achieve continuous adjustment of contacting pressure. Using this testing system, the vibration responses of the shrouded turbine blade with different mounting tightness and pressure angles are measured. After testing, the effects of the damping factors, such as mounting tightness and pressure angle, are analyzed according to the test data. The results show that the shrouded blade has an obvious nonlinear phenomenon. There is a most excellent mounting tightness to make the best effect of reduction vibration of the real shrouded turbine blade. The results also indicate that the selection of pressure angle should be considered carefully on the capacity of consuming the vibration energy of the shoulders and the steadiness of the resonance frequency of the shrouded turbine blade.
出处
《燃气涡轮试验与研究》
2008年第4期22-27,共6页
Gas Turbine Experiment and Research
关键词
非线性振动
干摩擦阻尼
接触紧度
接触角度
nonlinear vibration
dry friction damping
mounting tightness
pressure angle
