Volume 37 Issue 2
Feb.  2022
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Article Navigation >  Journal of Aerospace Power  > 2022  >  37(2): 296-307
WANG Xiaowei, SUN Dan, ZHAO Huan, MENG Jigang, ZHANG Guochen, ZHOU Min. Mechanism of influence of pre-swirl on leakage and rotordynamic characteristics of swirl brake seal[J]. Journal of Aerospace Power, 2022, 37(2): 296-307. doi: 10.13224/j.cnki.jasp.20210018
Citation: WANG Xiaowei, SUN Dan, ZHAO Huan, MENG Jigang, ZHANG Guochen, ZHOU Min. Mechanism of influence of pre-swirl on leakage and rotordynamic characteristics of swirl brake seal[J]. Journal of Aerospace Power, 2022, 37(2): 296-307. doi: 10.13224/j.cnki.jasp.20210018
shu

Mechanism of influence of pre-swirl on leakage and rotordynamic characteristics of swirl brake seal

doi: 10.13224/j.cnki.jasp.20210018
  • 1.

    Key Laboratory of Advanced Measurement and Test Technology for

  • 2.

    Aviation Propulsion System，Liaoning Province，School of Aero-engine，Shenyang Aerospace University，Shenyang 110136，China

  • 3.

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

  • Received Date: 2021-01-13
  • 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.The leakage and dynamic characteristics of the seal with 20，40 swirl brakes and 40 long swirl brakes in the circumferential direction under different pre-swirl ratios were studied; based on the experimental verification of the accuracy of the numerical model，the changes of the flow field at the seal inlet，the swirl intensity in the seal cavity，the circumferential pressure difference and the flow excitation force were calculated and analyzed，and the influence mechanism of pre-swirl on the leakage and dynamic characteristics of the swirl brake seal was revealed. The results showed that the prominent feature of the swirl brake seal lies in that it can restrain the flow excitation and has little influence on the leakage. 40 long swirl brakes can reduce the leakage by 0.17% compared with the non-swirl brake seal when pre-swirl ratio was 0.75，primarily owing to the fact that the increase of pre-swirl augmented the circumferential flow component，which further aggravated the whirl dissipation phenomenon between the swirl brakes. The increase in the number of swirl brakes was beneficial to the dissipation of flow by swirling flow between the swirl brakes，thus reducing the leakage. Cross stiffness increased with the increase of pre-swirl ratio，and cross stiffness decreased while direct stiffness and effective stiffness increased with the increase of the number and length of swirl brakes under the same pre-swirl ratio. Direct damping and effective damping decreased with the increase of pre-swirl ratio，and increased with the increase of the number and length of swirl brakes. With the increase of pre-swirl ratio，the circumferential pressure difference of the seal cavity increased，the tangential component of the excitation force increased，and the radial component enlarged，which reduced the stability of the rotor.

     

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