刷式密封摩擦热效应数值与实验研究

doi:10.7527/S1000-6893.2021.25973

Abstract

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

CLC Number:

V233.5

SUN Dan, LI Hao, ZHAO Huan, ZHANG Guochen, LI Yu, FENG Yuzhong. Numerical and experimental study of frictional thermal effects of brush seals[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(12): 425973.

References

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Numerical and experimental study of frictional thermal effects of brush seals

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