Volume 32 Issue 4
Apr.  2017
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Numerical study on static and dynamic characteristics of negative dislocated seal[J]. Journal of Aerospace Power, 2017, 32(4): 791-799. doi: 10.13224/j.cnki.jasp.2017.04.003
Citation: Numerical study on static and dynamic characteristics of negative dislocated seal[J]. Journal of Aerospace Power, 2017, 32(4): 791-799. doi: 10.13224/j.cnki.jasp.2017.04.003

Numerical study on static and dynamic characteristics of negative dislocated seal

doi: 10.13224/j.cnki.jasp.2017.04.003
  • Received Date: 2015-05-21
  • Publish Date: 2017-04-28
  • A kind of negative dislocated seal based on the dislocated bearing theory was presented to eliminate hydrodynamic effects and reduce air induced force. The static and dynamic characteristics of negative dislocated seals based on computational fluid dynamic (CFD) moving-gird technology were put forward. The effects of the eccentricity ratio and dislocation ratio on the leakage, circumferential pressure distribution, air force, rotor dynamic characteristics coefficients, and seal rotor stability were analyzed. Results show the seal leakage increases with the eccentricity ratio and dislocation ratio; the seal gap fluid circumferential pressure distribution satisfies the sine law. Compared with the traditional cylinder seals, the negative dislocated seal has divergent wedge gap, and reduces the hydrodynamic pressure effects, circumferential pressure difference and seal tangential force. This is the main reason for the negative dislocated seal suppression of air force. With the increase of the eccentricity ratio, the seal absolute value of stiffness and the cross-coupled damping increase and the direct damping decreases. This seal can effectively reduce the cross-coupled stiffness and increase the direct damping coefficients, the effective stiffness and effective damping so that the seal stability improves.

     

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