Volume 37 Issue 6
Jun.  2022
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Article Navigation >  Journal of Aerospace Power  > 2022  >  37(6): 1234-1247
FENG Yuzhong, ZHAO Huan, SUN Dan, MU Wei, ZHANG Guochen, LI Hao. Numerical and experimental research on influence of brush bristle wear on leakage and flow characteristics of brush seal[J]. Journal of Aerospace Power, 2022, 37(6): 1234-1247. doi: 10.13224/j.cnki.jasp.20210031
Citation: FENG Yuzhong, ZHAO Huan, SUN Dan, MU Wei, ZHANG Guochen, LI Hao. Numerical and experimental research on influence of brush bristle wear on leakage and flow characteristics of brush seal[J]. Journal of Aerospace Power, 2022, 37(6): 1234-1247. doi: 10.13224/j.cnki.jasp.20210031
shu

Numerical and experimental research on influence of brush bristle wear on leakage and flow characteristics of brush seal

doi: 10.13224/j.cnki.jasp.20210031
  • 1.

    Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System，School of Aero-engine，Shenyang Aerospace University，Shenyang 110136，China

  • 2.

    Key Lab for Power Transmission of Aero Engine，Shenyang Engine Research Institute，Aero Engine Corporation of China，Shenyang 110015，China

  • Received Date: 2021-01-21
  • Publish Date: 2022-06-28
    Abstract
  • Using a combination of finite element analysis and computational fluid dynamics，a model for solving the leakage and flow characteristics of the brush seal considering the wear of the brush bristle was established，and an experimental device for the friction and wear characteristics of the brush seal based on the cylindrical circumferential friction was designed and built.The positive pressure characteristics between the brush bristle and the rotor were studied by experiment.Based on the experimental verification of the accuracy of the numerical simulation，the influence of the brush bristle wear on the leakage and flow characteristics of the brush seal was studied.The research results showed that from the upstream to the downstream of bristle pack，the positive pressure between the brush bristle and the rotor，and the wear length of the brush bristle both decreased first and then increased；the wear length of the brush bristle increased with the increase of the amount of interference and the diameter of the brush bristle，and decreased with the increase of pressure ratio and the length of the brush bristle.The leakage of the brush seal considering the wear of the brush bristle increased with the increase of the pressure ratio，the amount of interference and the diameter of the brush bristle，and decreased with the increase of the bristle length.The viewpoint was proposed that the change rate of leakage characterized the degree of influence of the brush bristle wear on the leakage characteristics of the brush seal.The change rate of the leakage increased with the increase of the diameter of the brush bristle，and decreased with the increase of the length of the brush bristle and the pressure ratio.Under pressure ratio of 2.5 conditions，when the diameter of the brush bristle increased from 0.09 mm to 0.11 mm，the change rate of leakage increased from 9.53% to 19.18%；when the length of the brush bristle increased from 15.556 mm to 17.556 mm，the change rate of leakage decreased from 13.47% to 5.38%.Increasing the length of the brush bristle and reducing the diameter of the brush bristle can reduce the influence of bristle wear on the sealing performance of the brush seal.

     

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