Volume 30 Issue 5
May  2015
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CHEN Xiang, ZHU Jing, ZHANG Ya. Vibration characteristics analysis of blisk with cracking blades on axial flow compressor[J]. Journal of Aerospace Power, 2015, 30(5): 1141-1148. doi: 10.13224/j.cnki.jasp.2015.05.015
Citation: CHEN Xiang, ZHU Jing, ZHANG Ya. Vibration characteristics analysis of blisk with cracking blades on axial flow compressor[J]. Journal of Aerospace Power, 2015, 30(5): 1141-1148. doi: 10.13224/j.cnki.jasp.2015.05.015

Vibration characteristics analysis of blisk with cracking blades on axial flow compressor

doi: 10.13224/j.cnki.jasp.2015.05.015
  • Received Date: 2013-12-04
  • Publish Date: 2015-05-28
  • Crack fault of rotor blades occurred during performance experiment of an axial flow compressor. According to the structure characteristics of the compressor, the time-domain signal, frequency-domain signal of vibration response and high-frequency fluctuation were analyzed, and vibration characteristics of blisk with cracking blades on axial flow compressor were summarized. The results show that the blisk with cracking blades can cause vibration response of the axial flow compressor to present the nonlinear characteristics and the splitting of formant in the vibration frequency range, indicating the blade crack could induce mistuning of the first-stage rotor blisk of the axial flow compressor. With the rise of the speed, the frequencies of two formants fluctuate (periods of fluctuation about 8s and 9.2s respectively), and the blade crack grows and the number of cracking blades increases, so the mistuning extent of the blisk increases and modal localization of low order modes of the blisk appeares.

     

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