Effect of Swirl Brakes on Unsteady Flow Excitation Characteristics of Hole-Pattern Seal

doi:10.7652/xjtuxb201601003

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Effect of Swirl Brakes on Unsteady Flow Excitation Characteristics of Hole-Pattern Seal

更新时间：2025-07-09

- Effect of Swirl Brakes on Unsteady Flow Excitation Characteristics of Hole-Pattern Seal
- Vol. 50, Issue 1, Pages: 16-21(2016)
- 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/xjtuxb201601003
  CLC： TK474
- Online First：10 January 2016，
  
  Published：2016
- 稿件说明：
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Effect of Swirl Brakes on Unsteady Flow Excitation Characteristics of Hole-Pattern Seal[J]. 2016, 50(1): 16-21.
DOI：

Effect of Swirl Brakes on Unsteady Flow Excitation Characteristics of Hole-Pattern Seal[J]. 2016, 50(1): 16-21. DOI： 10.7652/xjtuxb201601003.

摘要

为了展示透平机械密封系统设计中进口防旋板在改善密封转子动力特性和增强转子系统稳定性的止旋方面的性能

采用基于转子多频椭圆轨迹涡动模型和动网格技术的非定常数值方法

研究了进口防旋板对孔型密封非定常气流激振力和转子动力特性系数的影响

计算分析了进口预旋比分别为0和0.6时2种进口防旋板结构的孔型密封转子动力特性系数、非定常气流激振力和流场特性

并与实验结果进行了对比。研究表明:非定常数值方法能够准确预测与频率相关的孔型密封转子动力特性系数; 进口预旋可显著减小孔型密封的有效阻尼、增大有效阻尼项的穿越频率

易诱发转子涡动失稳; 进口防旋板能够有效减小孔型密封的进口旋流速度、孔型密封的交叉刚度和有效阻尼穿越频率

增大孔型密封的有效刚度和有效阻尼

进而提高转子系统的稳定性。

Abstract

To reveal the anti-swirl performance of the swirl brake on improving the seal rotordynamic performance and enhancing rotor stability in turbomachinery

the effects of swirl brakes on the transient flow excitation characteristics and rotordynamic coefficients of a hole-pattern seal are numerically investigated. With computational fluid dynamics(CFD)method based on the multi-frequency elliptical orbit rotor whirling model and mesh deformation technique

the rotordynamic coefficients

transient fluid response forces and flow pattern of the hole-pattern seal are solved and analyzed for two types of swirl brakes at inlet preswirl ratios of 0 and 0.6. The predicted rotordynamic coefficients are compared with the experiment data. The numerical results show that the present transient numerical method enables to accurately predict the frequency-dependent rotordynamic coefficients of hole-pattern seal. Inlet preswirl significantly decreases effective damping in the hole-pattern seal and increases in the crossover frequency of the effective damping term

which usually induces rotor instability vibration. The swirl brake is very useful to eliminate rotor instability vibration because it can obviously reduce the cross-coupling stiffness and the crossover frequency

and increase the hole-pattern seal effective stiffness and effective damping by reducing the inlet preswirl velocity.

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references

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