Investigation on the Leakage Performance and Rotordynamic Coefficients of Labyrinth Seal with Mushroom-Shaped Tooth Wear

doi:10.7652/xjtuxb201801007

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Investigation on the Leakage Performance and Rotordynamic Coefficients of Labyrinth Seal with Mushroom-Shaped Tooth Wear

更新时间：2025-07-09

- Investigation on the Leakage Performance and Rotordynamic Coefficients of Labyrinth Seal with Mushroom-Shaped Tooth Wear
- Vol. 52, Issue 1, Pages: 40-46(2018)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201801007
  CLC： V231.1
- Online First：10 January 2018，
  
  Published：2018
- 稿件说明：
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Investigation on the Leakage Performance and Rotordynamic Coefficients of Labyrinth Seal with Mushroom-Shaped Tooth Wear[J]. 2018, 52(1): 40-46.
DOI：

Investigation on the Leakage Performance and Rotordynamic Coefficients of Labyrinth Seal with Mushroom-Shaped Tooth Wear[J]. 2018, 52(1): 40-46. DOI： 10.7652/xjtuxb201801007.

摘要

采用基于转子多频椭圆涡动模型和动网格技术的Unsteady Reynolds-Averaged Navier-Stokes(URANS)方程求解方法

研究了迷宫齿蘑菇形磨损对密封泄漏特性和气流激振转子动力特性的影响

计算分析了未磨损以及磨损间隙分别为0.4、0.5、0.6 mm时的密封泄漏量

流场以及转子动力特性系数。结果表明:迷宫齿蘑菇形磨损使得密封间隙内缩流面积增加

导致迷宫密封泄漏量随磨损间隙增加而增加

且当磨损间隙大于0.4 mm时

泄漏量随磨损间隙增加而线性增加; 迷宫齿蘑菇形磨损增加了密封的直接刚度

降低了密封交叉刚度的大小以及直接阻尼

但当磨损间隙超过0.5 mm时

直接阻尼不再发生改变; 随着迷宫齿蘑菇形磨损间隙增加

迷宫密封有效阻尼降低

从而使得转子稳定性降低

但仍然处于稳定范围内。

Abstract

The influence of mushroom-shaped tooth wear on leakage performance and fluid excited rotordynamic characteristics of labyrinth seal was numerically investigated by means of the unsteady Reynolds-averaged Navier-Stokes(URANS)equation based on the multi-frequency elliptical orbit rotor whirling model and dynamic mesh technique. The leakage performance

flow fields and rotordynamic coefficients of labyrinth seal with unworn clearance of 0.3 mm and after-damage clearances of 0.4

0.5 and 0.6 mm were calculated. The obtained results indicate that a mushroom-shaped tooth wear causes an increase of vena contracta area in sealing clearance

thus leakage flow rate is increased with the worn clearance and a linear increase is expected when after-damage clearance is over 0.4 mm. In addition

a mushroom-shaped tooth wear results in an obvious increase in direct stiffness and a drop of cross-coupling stiffness and direct damping

but direct damping will be no longer affected by worn clearance when the worn clearance is above 0.5 mm. Also

the stability is reduced as a result of a drop in effective damping with the increase of worn clearance

but is still within a stable range.

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references

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WANG W Z, LIU Y Z, MENG G, et al. Influence of rub groove on rotordynamics associated with leakage air flow through a labyrinth seal [J]. Journal of Mechanical Science and Technology, 2010, 24(8): 1573-1581.

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