Experimental Research on Rotordynamic Characteristics of Labyrinth Seals at High Inlet Preswirl

FANG Zhi; LI Zhigang; WANG Tianhao; XUE Wensong; LI Jun

doi:10.7652/xjtuxb202207010

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Experimental Research on Rotordynamic Characteristics of Labyrinth Seals at High Inlet Preswirl

更新时间：2025-07-09

- Experimental Research on Rotordynamic Characteristics of Labyrinth Seals at High Inlet Preswirl
- Vol. 56, Issue 7, Pages: 86-95(2022)
- 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/xjtuxb202207010
  CLC： TK476
- Online First：10 July 2022，
  
  Published：2022
- 稿件说明：
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FANG Zhi, LI Zhigang, WANG Tianhao, et al. Experimental Research on Rotordynamic Characteristics of Labyrinth Seals at High Inlet Preswirl[J]. 2022, 56(7): 86-95.
DOI：

FANG Zhi, LI Zhigang, WANG Tianhao, et al. Experimental Research on Rotordynamic Characteristics of Labyrinth Seals at High Inlet Preswirl[J]. 2022, 56(7): 86-95. DOI： 10.7652/xjtuxb202207010.

摘要

为获得高进口预旋条件下迷宫密封转子动力特性

阐明其气流激振失稳机制

本文基于西安交通大学动密封转子动力特性实验台

实验研究了高进口预旋条件下(预旋比μ

>0.8)

压比以及转速对迷宫密封转子动力特性影响规律。实验测量了2种压比(π=3.0

4.0)、3种转速(n=3 000

6 000

12 000 r/min)下迷宫密封频率相关的转子动力特性系数。研究发现:高预旋条件下

迷宫密封交叉刚度始终为较大的正值

导致有效阻尼始终为负值

不利于转子系统稳定

容易诱发转子失稳; 压比对迷宫密封转子动力特性影响显著

随压比增加

迷宫密封直接刚度幅值显著增大

交叉刚度始终为正值且幅值显著增大

有效阻尼明显降低; 转速对迷宫密封转子动力特性影响较小

直接刚度、直接阻尼对转速变化不敏感

基本保持不变

交叉刚度随转速增加略微增加

进而导致有效阻尼略微减小。

Abstract

To better understand the rotordynamic characteristics of a labyrinth seal at high inlet preswirl and elucidate the mechanism of instability induced by airflow

the rotordynamic characteristic test rig of Xi'an Jiaotong University was utilized to research the effects of pressure ratio and rotational speed on the rotordynamic characteristics of the labyrinth seal at high inlet preswirl(preswirl ratio μ

>0.8). The frequency-dependent rotordynamic coefficients were measured at two pressure ratios(π=3.0

4.0)and three rotational speeds(n=3 000

6 000

12 000 r/min). The results show that at hi

gh inlet preswirl

the labyrinth seal had always a large positive cross-coupled stiffness so that its effective damping was always negative

which was not conducive to the stability and may cause instability of the rotor system. It is also shown that the rotordynamic characteristics were significantly affected by the pressure ratio:As the ratio increased

the direct stiffness increased greatly

the cross-coupled stiffness was always positive and increased greatly

and the effective damping decreased significantly and that the rotordynamic characteristics were slightly affected by the rotational speed:Direct stiffness and direct damping were insensitive to speed change and remained substantially unchanged

and the cross-coupled stiffness increased slightly along with the speed increase

resulting in a slight decrease of effective damping.

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references

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