Effects of Backing Plate Structure on Leakage and Heat Transfer Characteristics of Brush Seals Considering Bristle Pack Deformation

doi:10.7652/xjtuxb201909003

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Effects of Backing Plate Structure on Leakage and Heat Transfer Characteristics of Brush Seals Considering Bristle Pack Deformation

更新时间：2025-07-09

- Effects of Backing Plate Structure on Leakage and Heat Transfer Characteristics of Brush Seals Considering Bristle Pack Deformation
- Vol. 53, Issue 9, Pages: 15-25(2019)
- 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：
- DOI：10.7652/xjtuxb201909003
  CLC： TK474.7
- Online First：10 September 2019，
  
  Published：2019
- 稿件说明：
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Effects of Backing Plate Structure on Leakage and Heat Transfer Characteristics of Brush Seals Considering Bristle Pack Deformation[J]. 2019, 53(9): 15-25.
DOI：

Effects of Backing Plate Structure on Leakage and Heat Transfer Characteristics of Brush Seals Considering Bristle Pack Deformation[J]. 2019, 53(9): 15-25. DOI： 10.7652/xjtuxb201909003.

摘要

采用基于非线性Darcian多孔介质模型的三维RANS方程耦合有限元分析接触模型的数值方法

建立了考虑泄漏流气动力、刷丝间摩擦力以及刷丝与前后夹板间相互作用的刷丝变形预测模型

并对比分析了3种后夹板结构对刷式密封泄漏特性、力学特性和传热特性的影响。所建模型可为刷式密封刚化效应、摩擦热效应的研究以及先进刷式密封的设计提供一定的技术支撑。数值计算得到的刷式密封泄漏量与实验测量数据吻合良好

验证了数值方法的可靠性。研究结果表明:相比于典型后夹板结构的刷式密封

后夹板环形槽结构对泄漏量及压力分布影响较小; 刷丝束所受到的轴向气动力随着压比的增大近似呈线性增大; 后夹板环形槽增加了下游刷丝束的压力

减小了刷丝轴向变形量

可有效防止刷丝发生刚化效应

降低泄漏气流对刷丝束造成的扰动; 刷式密封高温区出现在刷丝束与转子表面接触处

后夹板环形槽结构可有效改善刷丝束与转子内部的温度分布。

Abstract

A prediction model of bristle pack deformation in consideration of the leakage flow aerodynamic force

the frictional force between bristles

and the interaction between bristle pack and front or backing plate was presented.The three-dimensional Reynolds-averaged Navier-Stokes(RANS)equations based on non-linear Darcian porous medium model and combined with finite element analysis contact model were applied to analy-e the effects of three different backing plate structures on the leakage flow

tip force and heat transfer characteristics of the brush seal.The numerical results of leakage flow rate of brush seal with typical backing plate structure agree well with the experimental data

which verifies the reliability of this numerical method.The results show that the influences of the backing plate with annular groove on the leakage flow and pressure distribution of brush seal are small compared with typical backing plate structure.The axial aerodynamic force acting on the bristle pack in

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references

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