Investigations on the Leakage Characteristics and Rotordynamic Coefficients of Labyrinth Seal with Tooth Bending Damage

doi:10.7652/xjtuxb201806023

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Investigations on the Leakage Characteristics and Rotordynamic Coefficients of Labyrinth Seal with Tooth Bending Damage

更新时间：2025-07-09

- Investigations on the Leakage Characteristics and Rotordynamic Coefficients of Labyrinth Seal with Tooth Bending Damage
- Vol. 52, Issue 6, Pages: 157-164(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/xjtuxb201806023
  CLC： V231.1
- Online First：10 June 2018，
  
  Published：2018
- 稿件说明：
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Investigations on the Leakage Characteristics and Rotordynamic Coefficients of Labyrinth Seal with Tooth Bending Damage[J]. 2018, 52(6): 157-164.
DOI：

Investigations on the Leakage Characteristics and Rotordynamic Coefficients of Labyrinth Seal with Tooth Bending Damage[J]. 2018, 52(6): 157-164. DOI： 10.7652/xjtuxb201806023.

摘要

针对迷宫密封在运行过程中因碰磨因素等导致迷宫齿弯曲磨损

进而影响其泄漏和转子动力特性的问题

开展了迷宫齿弯曲磨损时密封泄漏和转子动力特性变化的数值研究。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

计算分析了迷宫齿未弯曲磨损时间隙为0.3 mm以及3种不同弯曲程度下间隙为0.4、0.5、0.6 mm时的密封泄漏量和转子动力特性系数

并计算了未弯曲磨损条件下间隙为0.4、0.5、0.6 mm时密封泄漏量以进行对比。研究结果表明:迷宫齿弯曲磨损时密封泄漏量是由径向间隙与弯曲曲率共同决定的。当迷宫齿未弯曲时

密封泄漏量随径向间隙增加而线性增加; 迷宫齿弯曲曲率增加会削弱密封入口的压缩效应

增加密封归一化缩流面积; 当径向间隙为0.6 mm时

迷宫齿弯曲使得密封泄漏量增加6.1%。随着迷宫齿弯曲磨损后径向间隙增加

密封直接刚度逐渐增加

导致转子系统的临界转速提高

对于运行转速小于临界转速的转子系统

有利于避免与转子系统发生共振。交叉刚度大小和直接阻尼随迷宫齿弯曲磨损后径向间隙增加而逐渐降低

引起密封有效阻尼逐渐降低

不利于转子系统的稳定性。

Abstract

The labyrinth tooth will be bent damage during the turbomachinery operational process when the labyrinth seal rubs with the shaft. This behavior results in the variation of the leakage flow rate and rotordynamic coefficients of labyrinth seal. A numerical method for prediction of the leakage flow rate and rotordynamic coefficient of labyrinth seal with tooth bending damage is proposed. Numerical investigations on the effects of tooth bending damage on leakage performance and rotordynamic coefficients of labyrinth seal are conducted by using the multi-frequency elliptical orbit rotor whirling mode and the dynamic mesh technique to solve the unsteady Reynolds-averaged Navier-Stokes(URANS)equation. The leakage performance and rotordynamic coefficients of labyrinth seal with pre-bend clearance of 0.3 mm and after-bend clearances of 0.4 mm

0.5 mm

0.6 mm are calculated. Also

the leakage performance of labyrinth seal with unbent clearances of 0.4 mm

0.5 mm

0.6 mm are computed. Results show that the mass flow rate for after-bend labyrinth seal is affected by the radial clearance and curvature

and the mass flow rate linearly increases with enlarging radial clearance for unbent labyrinth seals(constant curvature). On the other hand

increasing curvature will weaken the vena contract effect and broaden dimensionless vena contract area. The mass flow rate for the labyrinth seal with after-bend clearance of 0.6 mm is 6.1% more than that for the labyrinth seal with unbent clearance of 0.6 mm. Moreover

an increase in radial clearance for bent labyrinth seals generates an increase in direct stiffness

and results an increase of the critical speed of the rotor system. This is helpful to avoid resonance when the rotational speed is lower than the critical speed of rotor system. In addition

the magnitude of cross-coupling stiffness and direct damping reduce with the increased radial clearances for bent labyrinth seal

and effective damping decreases gradually when an increase in radial clearance occurs for bent labyrinth seal

which is not beneficial for the safe operation of the rotor system.

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references

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School of Energy and Power Engineering, Xi'an Jiaotong University

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