Volume 36 Issue 2
Feb.  2021
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Article Navigation >  Journal of Aerospace Power  > 2021  >  36(2): 310-319
DU Chenyu, SUN Dan, LIU Yongquan, ZHAN Peng, XIN Qi. Numerical investigation on induced mechanism of blow-down effect of brush seals with fluid-structure interaction[J]. Journal of Aerospace Power, 2021, 36(2): 310-319. doi: 10.13224/j.cnki.jasp.2021.02.009
Citation: DU Chenyu, SUN Dan, LIU Yongquan, ZHAN Peng, XIN Qi. Numerical investigation on induced mechanism of blow-down effect of brush seals with fluid-structure interaction[J]. Journal of Aerospace Power, 2021, 36(2): 310-319. doi: 10.13224/j.cnki.jasp.2021.02.009
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Numerical investigation on induced mechanism of blow-down effect of brush seals with fluid-structure interaction

doi: 10.13224/j.cnki.jasp.2021.02.009
  • 1.

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

  • 2.

    Shenyang Engine Research Institute,Aero Engine Corporation of China,Shenyang 110115,China

  • 3.

    Key Laboratory for Power Transmission of Aero Engine,Aero Engine Corporation of China,Shenyang 110115,China

  • Received Date: 2020-05-27
  • Publish Date: 2021-02-28
    Abstract
  • The theoretical model of blow-down effect of brush seals was analyzed. The three-dimensional transient numerical model of blow-down effect of brush seals based on arbitrary Lagrange-Euler（ALE） fluid-structure interaction method was established. The axial, radial and sectional deflection characteristics of bristles were studied respectively. The radial blow-down displacements of bristles were analyzed quantitatively, and the induced mechanism of blow-down effect of brush seals was revealed. The results showed that the leakage can be calculated more accurately with consideration of blow-down effect, because the bristle radial clearance was reduced by blow-down effect. Blow-down effect of brush seals presented an unsteady deflection with bristle oscillation. Compared with bristle cross section in the radial middle and end position of backing plate, blow-down effect and bristle oscillation of bristle tip were stronger. Bristles had more radial blow-down displacements and stronger bristle oscillation with the increase of inlet-outlet pressure ratio. When the inlet-outlet pressure ratio was 2, 3 and 4, the maximum radial blow-down displacement of bristles in the middle of bristle pack was 0.004, 0.010 mm and 0.019 mm, respectively, under the studied condition. The initial condition for the bristles with a certain circumferential lay angle and the radial pressure gradient in bristle pack contributed to the induced blow-down effect, and blow-down effect was further influenced by the normal pressure and the tangential friction between bristles. Blow-down effect of brush seals can be weakened by increasing the circumferential lay angle.

     

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