Numerical study on leakage and dynamic characteristics of circumferentially divergent pocket damping seal

Lu BAI; Dan SUN; Huan ZHAO; Zhonghui XIAO; Jigang MENG; Yong HU

doi:10.13224/j.cnki.jasp.20210076

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Numerical study on leakage and dynamic characteristics of circumferentially divergent pocket damping seal

Structure,Strength and Vibration | 更新时间：2025-04-07

- Numerical study on leakage and dynamic characteristics of circumferentially divergent pocket damping seal
- Journal of Aerospace Power Vol. 37, Issue 1, Pages: 114-123(2022)
- 作者机构：
  
  1.沈阳航空航天大学航空发动机学院;辽宁省航空推进系统先进测试技术重点实验室，沈阳 110136
  2.沈阳鼓风机集团股份有限公司辽宁重大装备制造协同创新中心，沈阳 110142
- 作者简介：
- 基金信息：
- DOI：10.13224/j.cnki.jasp.20210076
  CLC：
- 稿件说明：
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Lu BAI, Dan SUN, Huan ZHAO, et al. Numerical study on leakage and dynamic characteristics of circumferentially divergent pocket damping seal[J]. Journal of Aerospace Power, 2022, 37(1): 114-123.
DOI：

Lu BAI, Dan SUN, Huan ZHAO, et al. Numerical study on leakage and dynamic characteristics of circumferentially divergent pocket damping seal[J]. Journal of Aerospace Power, 2022, 37(1): 114-123. DOI： 10.13224/j.cnki.jasp.20210076.

摘要

提出一种周向发散式袋型阻尼密封结构，建立了袋型阻尼密封多频椭圆涡动求解模型，在实验验证求解模型准确性的基础上，研究了进出口压比、偏心率对袋型阻尼密封泄漏特性与动力特性的影响，分析了两种袋型阻尼密封的转子稳定性。结果表明：两种袋型阻尼密封的泄漏量平均相差0.89%，两者泄漏特性相当。传统袋型阻尼密封在转子偏心状态时各腔室存在较大周向压力差，周向发散式袋型阻尼密封各腔室压力分布基本均匀；两者切向气流力与转子涡动方向相反，均抑制转子的涡动，且周向发散式袋型阻尼密封的切向气流力是传统袋型阻尼密封的2.29倍；周向发散式袋型阻尼密封的平均有效阻尼是传统袋型阻尼密封的1.29倍，周向发散式袋型阻尼密封可提高转子系统的稳定性。

Abstract

A type of circumferentially divergent pocket damping seal structure was proposed，the pocket damping seal multi⁃frequency elliptical vortex solution model was established，and based on the experimental verification of the accuracy of the pocket damping seal solution model，the effects of the inlet and outlet pressure ratio and eccentricity on the leakage characteristics and dynamic characteristics of pocket damping seal were studied，and the rotor stability of the pocket damping seals was analyzed.The research results showed that the difference in leakage between two pocket damping seals was 0.89% on average，and the leakage characteristics of these two were equivalent.The traditional pocket damping seal had a large circumferential pressure difference in each chamber when the rotor was eccentric，while the pressure distribution in each chamber of the circumferentially divergent pocket damping seal was basically uniform； the tangential airflow force of these two was opposite to the direction of the rotor whirl，and both suppressed the vortex of the rotor，and the tangential air force of the circumferentially divergent pocket damping seal was 2.29 times that of the traditional pocket damping seal；the average effective stiffness of the circumferentially divergent pocket damping seal was 1.29 times that of the traditional pocket damping seal，the circumferentially divergent pocket damping seal was more conducive to the stability of the rotor system.

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references

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