采用三维叉排管束模型的刷式密封泄漏特性研究

马登骞; 张元桥; 李志刚; 李军; 晏鑫

doi:10.7652/xjtuxb202009008

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采用三维叉排管束模型的刷式密封泄漏特性研究

更新时间：2025-07-09

- 采用三维叉排管束模型的刷式密封泄漏特性研究
- Investigating Leakage Flow Characteristics of Brush Seals via Three-Dimensional Staggered Tube Bundle Model
- 西安交通大学学报 2020年54卷第9期页码：72-80
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
  
  : 2020-02-21。作者简介: 马登骞(1994—),男,博士生;李军(通信作者),男,教授,博士生导师。基金项目: 国家重点研发计划资助项目(2017YFB0601804);国家自然科学基金资助项目(51776152)
- DOI：10.7652/xjtuxb202009008
  中图分类号： TK474.7
- 网络首发：2020-09-10，
  
  纸质出版：2020
- 稿件说明：
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马登骞, 张元桥, 李志刚, 等. 采用三维叉排管束模型的刷式密封泄漏特性研究[J]. 西安交通大学学报, 2020,54(9):72-80.

Investigating Leakage Flow Characteristics of Brush Seals via Three-Dimensional Staggered Tube Bundle Model[J]. 2020, 54(9): 72-80.
马登骞, 张元桥, 李志刚, 等. 采用三维叉排管束模型的刷式密封泄漏特性研究[J]. 西安交通大学学报, 2020,54(9):72-80. DOI： 10.7652/xjtuxb202009008.

Investigating Leakage Flow Characteristics of Brush Seals via Three-Dimensional Staggered Tube Bundle Model[J]. 2020, 54(9): 72-80. DOI： 10.7652/xjtuxb202009008.

摘要

为准确预测刷式密封的泄漏流动以及阻力特性

提出了将多块结构化网格以及动网格技术应用于刷式密封的三维叉排管束模型。多块结构化网格的使用保证了刷丝束流体域与腔室间无需设置交界面

消除了因交界面的存在引起的插值误差。动网格技术能够实现刷丝束的整体轴向压紧。数值模拟得到的刷式密封泄漏量与实验数据吻合良好

验证了数值方法的可靠性。研究了进出口总静压比(1.5

2.5

3.5)、密封间隙(0

0.1

0.2 mm)以及轴向截距减小量(0～0.005 mm)对刷式密封泄漏流动和阻力特性的影响规律

结果表明:轴向截距减小量的增大对于接触式刷式密封的泄漏量相对变化率具有支配作用; 随着密封间隙的增大

轴向截距减小量的增大对间隙刷式密封的泄漏量相对变化率的影响逐渐减弱; 具有间隙的刷式密封的流动阻力参数欧拉数远小于接触式刷式密封; 密封间隙使得刷式密封泄漏流的压力能有效地转换为动能

增大了刷式密封的泄漏量。文中发展的三维叉排管束计算模型可为刷式密封封严机理和多场耦合分析提供技术手段。

Abstract

To accurately predict the leakage flow and resistance characteristics of brush seals

the multi-block structured mesh and the mesh motion technique are applied to the three-dimensional staggered tube bundle model of brush seals. The application of the multi-block structured mesh ensures that there is no need to set interfaces between the fluid domains of the bristle pack and cavity

hence the interpolation errors due to the existence of the interfaces are eliminated. The mesh motion technique could reali-e the overall axial compactness of the bristle pack. The numerical leakage flow rate of the brush seal is in good agreement with the experimental data and the validation of the developed numerical method is verified. The effects of the pressure ratio(1.5

2.5

3.5)

sealing clearance(0

0.1

0.2 mm)and longitudinal pitch reduction(0 - 0.005 mm)on the leakage flow rate and flow resistance performance of the brush seal are investigated. The results show that the reduction of longitudinal

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