刷式密封摩擦热效应数值与实验研究

孙丹; 李浩; 赵欢; 张国臣; 李玉; 冯毓钟

doi:10.7527/S1000-6893.2021.25973

航空学报 >

2022 , Vol. 43 >Issue 12: 425973 - 425973

DOI: https://doi.org/10.7527/S1000-6893.2021.25973

材料工程与机械制造

刷式密封摩擦热效应数值与实验研究

孙丹 ,
李浩 ,
赵欢 ,
张国臣 ,
李玉 ,
冯毓钟

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沈阳航空航天大学航空发动机学院辽宁省航空推进系统先进测试技术重点实验室, 沈阳 110136

收稿日期: 2021-06-16

修回日期: 2021-07-12

网络出版日期: 2021-10-09

基金资助

国家自然科学基金（52075346）；辽宁省自然科学基金（2019-ZD-0236）；辽宁省教育厅基础研究项目（JYT2020047）

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Numerical and experimental study of frictional thermal effects of brush seals

SUN Dan ,
LI Hao ,
ZHAO Huan ,
ZHANG Guochen ,
LI Yu ,
FENG Yuzhong

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Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System, School of Aero-Engine, Shenyang Aerospace University, Shenyang 110136, China

Received date: 2021-06-16

Revised date: 2021-07-12

Online published: 2021-10-09

Supported by

National Natural Science Foundation of China (52075346); Natural Science Foundation of Liaoning Province (2019-ZD-0236);Project of Department of Education of Liaoning Province (JYT2020047)

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摘要

刷式密封刷丝与转子表面高速接触摩擦产生的摩擦热效应直接影响刷式密封封严性能和使用寿命。基于刷丝-转子系统热固耦合方法建立了刷式密封摩擦热效应数值求解模型，设计搭建了刷式密封摩擦热效应实验装置，应用热成像仪实验研究了刷丝温度分布特性，在实验验证刷丝-转子系统热固耦合数值求解模型准确性基础上，研究了转速、干涉量、刷丝安装角、摩擦时长、刷丝束厚度、后挡板长度对刷式密封摩擦热效应的影响。研究结果表明：刷式密封刷丝温度数值计算与实验测量平均误差为8.9%，建立的刷丝-转子系统热固耦合模型具有较高准确性。实验研究得出刷式密封最高温度随刷丝束厚度增大逐渐增大；刷丝束最高温度随着后挡板长度减小而逐渐降低；最高温度随干涉量的增大逐渐增大，0.4 mm相较于0.3 mm干涉量最高温度升高了59.0℃，随着摩擦时长增大，刷丝与转子磨损量减小，温度逐渐下降。数值计算得出刷丝束应力最大值出现在刷丝固定端，接触变形最大值出现在中排刷丝尖端，最大温度值出现在刷丝自由端。刷式密封最高温度随着刷丝安装角的增大而降低；最高温度随着转速的上升逐渐增大，2 000 r/min转速相对于600 r/min转速最高温度提高了4.3倍；最高温度随干涉量的增大而逐渐增大，0.4 mm干涉量相对于0.3 mm干涉量最高温度提高了1.34倍。

关键词： 刷式密封; 摩擦热效应; 热固耦合; 红外热成像; 温度分布

本文引用格式

孙丹 , 李浩 , 赵欢 , 张国臣 , 李玉 , 冯毓钟 . 刷式密封摩擦热效应数值与实验研究[J]. 航空学报, 2022 , 43(12) : 425973 -425973 . DOI: 10.7527/S1000-6893.2021.25973

Abstract

The frictional heat effect generated by the friction between the bristle and the rotor surface at high speed directly affects the sealing performance and service life of the brush seal. Based on the thermo-mechanical coupling method of bristle-rotor system, a numerical solution model of frictional thermal effect of brush seal was established, an experimental device of frictional thermal effect of brush seal is designed and built, and the temperature distribution characteristics of bristle are investigated by thermal imager. The results show that the average error between the numerical calculation and experimental measurement of the bristle temperature of the brush seal is 8.9%, and the thermo-mechanical coupling model of the bristle-rotor system established in this paper is highly accurate. The experiment result shows that the maximum temperature of brush seal gradually increases with the increase of bristle packing thickness; the maximum temperature of the bristle packing decreases as the length of the backing plate decreases; the maximum temperature gradually increases with the increase of interference, and the maximum temperature of 0.4 mm interference increases 59.0℃ compared with 0.3 mm interference, and the temperature decreases with the increase of friction time and the decrease of bristle wear. Numerical calculation shows that the maximum value of bristle packing stress occurs at the fixed end of bristles; the maximum value of contact deformation occurs at the free end of middle row of bristle, and the maximum temperature occurs at the free end of bristles. The numerical calculation also shows that the maximum temperature of brush seal decreases with the increase of the bristle lay angle; the maximum temperature increases gradually with the increase of rotational speed, which means the maximum temperature increases 4.3 times at 2 000 r/min compared with 600 r/min; the maximum temperature increases gradually with the increase of interference, and the maximum temperature of 0.4 mm interference increases 1.34 times compared with 0.3 mm interference.

Key words： brush seal; frictional thermal effects; thermo-mechanical coupling; thermal imaging; temperature distribution

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