Experimental Study of Matching of Brush Seal Friction Pairs Based on Frictional Heating Effects

doi:10.3969/j.issn.1004-132X.2024.04.007

Abstract

Abstract: The frictional heating effects caused by the interaction between brush seal wire and rotor coating directly affected the sealing performance and service life of brush seals. The theory of frictional heating effects between brush seal frictional pairs was analyzed. The experimental device of frictional heating effects between brush seal frictional pairs was designed and built. Six brush seal experimental parts with different structural parameters and brush wire materials and four frictional turntables with different coating materials were designed and processed. The effects of working condition parameters, structural parameters and different frictional pair materials on the frictional heating effects of brush seals were studied experimentally. By comparing and analyzing the maximum temperature of brush seals and the wear morphology and wear amount of frictional pairs before and after wear, the matching relationship between brush wire and rotor coating material was obtained. The results show that the maximum temperature of brush seals increases rapidly and then tends to be stable with the increase of friction time, and increases with the increase of interference. When the interference increases from 0.3 mm to 0.4 mm, the average maximum temperature of brush wires rises to 39.96 ℃. The maximum temperature increases with the increase of the brush thickness and decreases with the increase of the rear baffle protection height. When the brush wire material is cobaltbased superalloy GH605, the best rotor coating material is WC; when the brush wire material is nickelbased superalloy GH4169, the best rotor coating material is ZrO2.These two matching materials may produce lower friction heat under the same working conditions, and the wear resistance is higher than that of other matching materials.

Key words: brush seal, frictional heating effect, friction pair, matching, interference

摘要： 刷丝与转子涂层相互作用产生的摩擦热效应直接影响刷式密封的密封性能和使用寿命。分析了刷式密封摩擦副之间的摩擦热效应理论，设计搭建了刷式密封摩擦副摩擦热效应实验装置，设计加工了6种不同结构参数与刷丝材料的刷式密封实验件和4种不同涂层材料的摩擦转盘，实验研究了工况参数、结构参数以及不同摩擦副材料对刷式密封摩擦热效应的影响，通过对比分析刷式密封最高温度以及磨损前后摩擦副的磨损形貌及磨损量，获取了刷丝与转子涂层材料的匹配性关系。研究结果表明：刷式密封最高温度会随着摩擦时长的增加先迅速升高后趋于稳定，随着干涉量的增大而升高，干涉量由0.3 mm增大至0.4 mm，刷丝平均最高温升达39.96 ℃；最高温度随着刷丝束厚度的增加而升高，随着后挡板保护高度的增大而降低；当刷丝材料为钴基高温合金GH605时，最佳转子涂层材料为WC，当刷丝材料为镍基高温合金GH4169时，最佳转子涂层材料为ZrO2，此两种匹配材料能够在相同工况下产生较低的摩擦热量，且耐磨性能高于其他匹配材料。

关键词: 刷式密封, 摩擦热效应, 摩擦副, 匹配性, 干涉量

CLC Number:

V233.5

YANG Yixiao, SUN Dan, LAN Kexin, ZHAO Huan, FENG Yuzhong, ZHANG Jieyi, . Experimental Study of Matching of Brush Seal Friction Pairs Based on Frictional Heating Effects[J]. China Mechanical Engineering, 2024, 35(04): 636-645，690.

杨艺潇, 孙丹, 兰可心, 赵欢, 冯毓钟, 张杰一, . 基于摩擦热效应的刷式密封摩擦副匹配性实验研究[J]. 中国机械工程, 2024, 35(04): 636-645，690.

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