Experimental Study on the Static Stability of Scallop Damper Seals

YAO Minglong; ZHANG Wanfu; ZHAO Qianqian; GU Qianlei; ZHANG Liyun; WU Weirong; YANG Jiangang

doi:10.19805/j.cnki.jcspe.2026.250105

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Experimental Study on the Static Stability of Scallop Damper Seals

更新时间：2026-06-11

- Experimental Study on the Static Stability of Scallop Damper Seals
- Chinese Journal of Power Engineering Vol. 46, Issue 6, Pages: 28-35(2026)
- 作者机构：
  
  1. 上海理工大学能源与动力工程学院,上海,200093
  2. 中国电建江西省电力建设有限公司,江苏,南京,210019
  3. 东南大学能源与环境学院,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.250105
  CLC： TK263.2
- Published：2026
- 稿件说明：
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姚明龙, 张万福, 赵乾乾, 顾乾磊, 张吏雲, 吴蔚荣, 杨建刚. 扇贝阻尼密封静态稳定性实验研究[J]. 动力工程学报, 2026, 46(6): 28-35.
姚明龙, 张万福, 赵乾乾, 顾乾磊, 张吏雲, 吴蔚荣, 杨建刚. 扇贝阻尼密封静态稳定性实验研究[J]. 动力工程学报, 2026, 46(6): 28-35. DOI： 10.19805/j.cnki.jcspe.2026.250105.

DOI： 10.19805/j.cnki.jcspe.2026.250105

摘要

提出了实验识别扇贝阻尼密封气流力及静态刚度方法

并研究了不同进口压力、偏心率下静态气流力与静态刚度的变化规律。结果表明:气流力及静态刚度数值模拟与实验结果较吻合;相同进口压力下

增加偏心率

密封气流力逐渐增加

而静态刚度系数逐渐减小

静态刚度系数约为-6~40 kN/m;增加进口压力

气流力与刚度均呈现先增加后减小的趋势;密封沿轴向存在一个最大与最小间隙处的压力交叉点

在该点处压差由负转正

密封出口段最小间隙处马赫数增长较快

压力能转化为质量惯性力

使得最小间隙处压力小于最大间隙处

削弱了扇贝阻尼密封的静态稳定性;非阻塞工况下密封马赫数变化较小

静态稳定性更好。

Abstract

An experimental method for identifying the aerodynamic force and static stiffness of the scallop damper seals was proposed

and the variation characteristics of the static aerodynamic force and static stiffness under different inlet pressures and eccentricities were investigated. Results show that the numerical simulations of the aerodynamic force and static stiffness agree well with the experimental results. At the same inlet pressure

as the eccentricity increases

the aerodynamic force of the seal gradually increases

while the static stiffness coefficient gradually decreases

yielding a static stiffness coefficient ranging approximately from -6 to 40 kN/m. As the inlet pressure increases

both the aerodynamic force and stiffness exhibit a trend of initially increasing and subsequently decreasing. Along the axial direction of the seal

there exists a pressure crossover point between the maximum and minimum clearances

where the pressure difference transitions from negative to positive. In the outlet section of the seal

the Mach number at the minimum clearance increases rapidly

converting pressure energy into mass inertial force. This causes the pressure at the minimum clearance to drop below that at the maximum clearance

thereby weakening the static stability of the scallop damper seal. Under non-choked flow conditions

the change in Mach number is relatively small

leading to better static stability.

关键词

Keywords

references

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