Volume 37 Issue 2
Feb.  2022
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Article Navigation >  Journal of Aerospace Power  > 2022  >  37(2): 308-319
GUO Jindao, SUN Dan, ZHAO Huan, XIAO Zhonghui, MENG Jigang, HU Yong. Mechanism of influence of notch jet-flow on leakage and rotordynamic characteristics of pocket damper seals[J]. Journal of Aerospace Power, 2022, 37(2): 308-319. doi: 10.13224/j.cnki.jasp.20210021
Citation: GUO Jindao, SUN Dan, ZHAO Huan, XIAO Zhonghui, MENG Jigang, HU Yong. Mechanism of influence of notch jet-flow on leakage and rotordynamic characteristics of pocket damper seals[J]. Journal of Aerospace Power, 2022, 37(2): 308-319. doi: 10.13224/j.cnki.jasp.20210021
shu

Mechanism of influence of notch jet-flow on leakage and rotordynamic characteristics of pocket damper seals

doi: 10.13224/j.cnki.jasp.20210021
  • 1.

    Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System，Liaoning Province，School of Aero-engine，Shenyang Aerospace University，Shenyang 110136，China

  • 2.

    Collaborative Innovation Center of Machine Manufacturing in Liaoning， Shenyang Blower Works Group Company Limited，Shenyang 110142，China

  • Received Date: 2021-01-16
  • Publish Date: 2022-02-28
    Abstract
  • The unsteady dynamic mesh method was used to establish a multi-frequency elliptical whirl solving model to obtain the leakage and dynamic characteristics of pocket damper seals；based on the accuracy of the numerical model，the influences of different pressure ratio，rotor speed and notch position on leakage characteristics and the dynamic characteristics were studied，the speed and pressure distribution characteristics of different conditions and the notch position were analyzed，so the influence mechanism of notch jet-flow on leakage and dynamic characteristics of the pocket damper seals was revealed.The results showed that: notch jet-flow enhanced the straight-through effect of pocket damper seals，weakened the dissipation of air kinetic energy in the basic chamber，and increased the leakage.When the pressure ratio increased from 2 to 6.9，the leakage increased by 11.75%-12.67%.The notch jet-flow can reduce the cross stiffness of pocket damper seals，increase the direct damping and effective damping，and the effect was more significant when the rotor swirled at low frequency （frequency was less than 120 Hz）; the notch jet-flow can restrain the circumferential flow of the airflow in the downstream chamber，reduce the circumferential pressure difference，reduce the exciting force and improve the stability of the rotor.When the structural parameters of the notch were same，the circumferential second-order dividing point of the seal tooth at the outlet of the basic chamber was the best notch position.At this time，pocket damper seals had the minimum cross stiffness and the largest direct damping and effective damping.

     

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