航空发动机篦齿⁃橡胶涂层机匣碰摩实验

Rubbing experimental study on labyrinth and rubber⁃coated case for aero⁃engines

为了探明航空发动机增压级篦齿与橡胶涂层机匣碰摩引起的转静子振动特征,设计了转静局部碰摩实验器,测量和分析了不同转速碰摩过程中的转子振动位移、机匣与支座振动加速度、机匣与弹性支承应变、机匣温度等信号的时频域变化规律。结果表明,橡胶涂层的可磨损性和可熔化性对转静碰摩振动特征影响较大,碰摩过程中转静接触状态动态变化,碰摩呈现出能量高、突变性强、短时自脱离的特点,碰摩过程测量信号经过突变后可快速恢复原状态,碰摩激起转静子耦合振动,产生转子、静子固有频率共振,同时存在机匣固有频率与转频的调制振动。

To verify the rotor-stator vibration characteristics induced by rubbing between the labyrinth and rubbercoated case for aero-engine booster,a local rubbing experimental device was designed for rotor-stator.The timefrequency domain variations of rotor vibrational displacement,the vibration acceleration of the case and the base,the strain of the case and the elastic support,as well as case temperature were measured and analyzed systematically at various rubbing speeds.The results show that the rotor-stator rubbing features are significantly affected by the wear and fusion of the rubber coating,which results in a variational contacting status between rotor and stator during the rubbing process.The rubbing shows features of high energy,strong transient state and short-time self-separation.A typical period of abrupt change and recovery in short time can be observed for the monitored signals during the rub⁃bing.The rotor-stator coupling vibration is excited by rubbing,inducing resonance at natural frequencies of the rotor and the stator.In the meanwhile,the modulation vibration between the casing natural frequency and rotor frequency is captured.