Volume 39 Issue 6
Jun.  2024
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YE Qiangsheng, ZHANG Wanfu, ZHOU Qinghui, et al. Effect of tooth profile on the leakage and dynamic characteristics of labyrinth seals[J]. Journal of Aerospace Power, 2024, 39(6):20220460 doi: 10.13224/j.cnki.jasp.20220460
Citation: YE Qiangsheng, ZHANG Wanfu, ZHOU Qinghui, et al. Effect of tooth profile on the leakage and dynamic characteristics of labyrinth seals[J]. Journal of Aerospace Power, 2024, 39(6):20220460 doi: 10.13224/j.cnki.jasp.20220460

Effect of tooth profile on the leakage and dynamic characteristics of labyrinth seals

doi: 10.13224/j.cnki.jasp.20220460
  • Received Date: 2022-06-26
    Available Online: 2023-09-04
  • The three-dimensional numerical analysis models of teeth-on-stator labyrinth seal (TOS LS), teeth-on-rotor labyrinth seal (TOR LS) and interlocking labyrinth seal (ILS) were established. The effects of four tooth profile angles (θ=0°, 15°, 30°, 45°) on the leakage and dynamic characteristics of three labyrinth seals were investigated by applying multi-frequency elliptical whirling orbit model and computational fluid dynamics method. Under the operating conditions of 15000 r/min rotational speed and 6.9×105 Pa inlet pressure, although ILS leaked the least, it was easy to cause rotor instability if the tooth profile angle was too small (θ=0°, 15°); TOR LS had the worst sealing performance, while TOS LS had the best system stability. As the tooth profile angle increased from 0° to 45°: the leakage flow rate of TOS LS, TOR LS and ILS decreased by 5.6%, 5.1% and 16.8%; the absolute value of negative flow-induced tangential force for the middle cavity increased by 60.2%, 133.9% and 470.3%; the effective damping of the whole seal section increased by 44.9%−61.9%, 30.7%−53.6% and 90.4%−445.3%, respectively, indicating the system stability was significantly enhanced.

     

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