Volume 36 Issue 2
Feb.  2021
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DING Xiaofei, CAO Hang, FENG Guoquan, JIANG Jianling. Vibration fault analysis of aeroengine rotor disk cavity filled with oil[J]. Journal of Aerospace Power, 2021, 36(2): 341-351. doi: 10.13224/j.cnki.jasp.2021.02.012
Citation: DING Xiaofei, CAO Hang, FENG Guoquan, JIANG Jianling. Vibration fault analysis of aeroengine rotor disk cavity filled with oil[J]. Journal of Aerospace Power, 2021, 36(2): 341-351. doi: 10.13224/j.cnki.jasp.2021.02.012
shu

Vibration fault analysis of aeroengine rotor disk cavity filled with oil

doi: 10.13224/j.cnki.jasp.2021.02.012
  • 1.

    Shenyang Engine Research Institute,Aero Engine Corporation of China,Shenyang 110015,China

  • 2.

    Key Laboratory of Impact Dynamics on Aero Engine,Liaoning Province,Shenyang Engine Research Institute,Aero Engine Corporation of China，Shenyang 110015,China

  • Received Date: 2020-05-02
  • Publish Date: 2021-02-28
    Abstract
  • In combination with the problems of rotor cavity filled with oil vibration encountered in the test of aero engine rotor in the project, the research was carried out from the theory of vibration, dynamic characteristics and vibration signal analysis, and the failure mechanism of rotor disk cavity filled with oil was analyzed. The characteristics and regularity of instability vibration were acquired, the process and criteria for disc cavity fluid accumulation fault identification as well as its vibration monitoring guidance were established. The result showed that the subharmonic vibration was produced when the rotor speed was above the critical speed of the rotor if the rotor cavity was filled with oil, which caused the self-excited vibration of the rotor; and the frequency of the self-excited vibration was close to the first order critical speed of the rotor; and the rotor frequency vibration was still dominant when the rotor speed was below the critical speed, and the oil deposit could cause the increasing peak value of the over critical speed; the above-mentioned fault identification process and criteria were applied to an rotor of an engine to accurately identify the characteristics of rotor cavity filled with oil. Oil was found in the fan's secondary disk cavity when the rotor was dismantled. After cleaning up the oil, the abnormal vibration disappeared, which verified the correctness of the conclusions.

     

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