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刷式密封摩擦热效应数值与实验研究

孙丹1,李浩2,赵欢1,张国臣1,李 玉1,冯毓钟1   

  1. 1. 沈阳航空航天大学
    2. 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
  • 收稿日期:2021-06-17 修回日期:2021-09-01 出版日期:2021-10-09 发布日期:2021-10-09
  • 通讯作者: 赵欢
  • 基金资助:
    国家自然科学基金;辽宁省“兴辽英才计划”资助项目

Numerical and experimental study of frictional thermal effects of brush seals

  • Received:2021-06-17 Revised:2021-09-01 Online:2021-10-09 Published:2021-10-09

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%,本文建立的刷丝-转子系统热固耦合模型具有较高准确性。刷丝束最高温度出现在刷丝自由端,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,2000r/min转速相对于600r/min转速最高温度提高了4.3倍;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,0.4mm相较于0.3mm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,温度呈线性逐渐下降。

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

Abstract: The frictional heat effect generated by the friction between the brush filament and the rotor surface at high speed directly affects the sealing performance and service life of the brush seal. Based on the thermo-mechanical cou-pling method of brush-rotor system, a numerical solution model of frictional thermal effect of brush seal was estab-lished, an experimental device of frictional thermal effect of brush seal was designed and built, and the tempera-ture distribution characteristics of bristle were investigated by thermal imager. The effects of speed, interference, bristle installation angle, friction time, bristle package thickness and backing plate length on the frictional thermal effect of brush seal were investigated. The results show that the average error between the numerical calculation and experimental measurement of brush filament temperature is 8.9%, and the thermo-mechanical coupling mod-el of brush-rotor system established in this paper is highly accurate. The maximum temperature of the brush bun-dle appears at the free end of the brush filament, and the maximum temperature of the brush seal decreases with the increase of the installation angle of the brush filament; the maximum temperature increases gradually with the increase of the rotational speed, and the maximum temperature of the brush seal increases 4.3 times with the in-crease of the rotational speed of 2000r/min compared with 600r/min; the maximum temperature of the brush seal increases gradually with the increase of the thickness of the bristle package; the maximum temperature of the bris-tle package decreases gradually with the decrease of the backing plate; the maximum temperature decreases gradually with the decrease of the interference amount. The maximum temperature increases gradually with the increase of interference amount, and the maximum temperature of 0.4mm increases 59.0℃ compared with 0.3mm interference amount, and the temperature decreases linearly with the increase of friction time and the de-crease of brush filament and rotor wear.

Key words: brush seal, frictional thermal effects, thermo-mechanical coupling, thermal imaging, thermal imaging