Numerical Investigations on the Hysteresis Characteristics of Brush Seals

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Numerical Investigations on the Hysteresis Characteristics of Brush Seals

更新时间：2025-05-08

- Numerical Investigations on the Hysteresis Characteristics of Brush Seals
- Vol. 45, Issue 5, Pages: 36-41(2011)
- 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：
  CLC： TK262
- Online First：10 May 2011，
  
  Published：2011
- 稿件说明：
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Numerical Investigations on the Hysteresis Characteristics of Brush Seals[J]. 2011, 45(5): 36-41.
DOI：

Numerical Investigations on the Hysteresis Characteristics of Brush Seals[J]. 2011, 45(5): 36-41. DOI：

摘要

采用非线性接触模型对刷式密封的迟滞特性及其影响因素进行了研究.采用点-面接触、梁-梁相交接触和梁-梁平行接触模拟了刷式密封中刷丝端部与转子表面接触、刷丝与背板边缘接触以及刷丝之间的接触

建立了刷式密封的非线性接触模型

并通过试验研究的刷式密封迟滞特性的数据验证了所建立模型的有效性. 研究分析了刷丝径向刚度一定时

刷丝直径、刷丝长度和刷丝角度对刷式密封迟滞特性的影响规律

结果表明

刷丝端部压力计算值与理论值的比值可以更好地评定刷式密封迟滞特性的强弱.当刷丝直径保持不变时

随着刷丝角度的增加和刷丝长度的减小

刷式密封的迟滞特性越来越弱; 当刷丝长度一定时

随着刷丝角度和刷丝直径的增加

刷丝的迟滞特性越来越弱; 当刷丝角度一定时

不同刷丝直径和刷丝长度的刷式密封表现出相近的迟滞特性; 当刷丝径向刚度一定时

刷式密封的迟滞特性强弱主要由刷丝角度决定.

Abstract

The hysteresis characteristics of brush seal and its effects were numerically investigated using nonlinear contact FEM model. A nonlinear contact model of brush seal was established using methods of node-to-surface contact

beam-to-beam contact(two beams cross each other)and beam-to-beam contact(two beams roughly parallel)simulating bristle-rotor contact

bristle-backing plate contact and inter-bristle contact respectively. The feasibility and effectiveness of the developed nonlinear contact model were demonstrated through comparison of the numerical results and measured data of the hysteresis characteristics of the experimental brush seal. The effects of bristle diameter

bristle length and bristle lay angle on hysteresis characteristics of brush seal were studied at the constant bristle radial stiffness. The obtained results show that the ratio between the numerical and theoretical data of the bristle tip pressure can be able to evaluate the level of brush seal hysteresis characteristics effectively. The strength of the brush seal hysteresis characteristics became weaker with the bristle lay angle increasing and bristle length decreasing at the constant of bristle diameter. In addition

the strength of brush seal hysteresis characteristics became weaker with the bristle lay angle and bristle diameter increasing at the constant bristle length. Furthermore

similar hysteresis characteristics of brush seal with different bristle diameter and length were observed at the constant bristle radial stiffness and lay angle. The strength of hysteresis characteristics of brush seal was mostly influenced by the bristle lay angle at the constant bristle radial stiffness according to the present results.

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references

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