动压轴承流固界面非一致滑移流动分析方法及分布特征

doi:10.7527/S1000-6893.2022.27639

Abstract

Abstract:

To solve the problem of the analysis method for the variable scale flow in the micro clearance of the airborne gas foil bearing under large overload and large eccentricity， a coupled iterative interface non-uniform slip flow analysis method of the shear stress equation， the slip correction Reynolds equation and the gas film thickness equation based on elastohydrodynamic lubrication are established by deducing the local shear stress to calculate the slip velocity equation. The differences of the slip flow field between the non-uniform slip model and the traditional model and the evolution law of the circumferential non-uniform slip velocity are compared. The results show that the slip velocity distribution obtained by the non-uniform slip model is more consistent with the local Knudsen number. The maximum effect of the local slip on the gas film pressure is 10.6%， and the gas film pressure distribution is in good agreement with the experimental results. With the increase of the bearing number and eccentricity， slip sequentially occurs on the foil side and the shaft side. The slip regions expand from the minimum gas film thickness to both sides along the circumferential direction with continuously increasing slip velocity. The area of the slip region on the shaft side is up to twice as large as that on the foil side.

Key words: gas foil bearing, non-uniform slip flow, ultimate shear stress, slip velocity, gas film pressure

CLC Number:

V211.1

Jingyang ZHANG, Zhe CHEN, Yuanwei LYU, Yijian SUN, Jingzhou ZHANG, Weidong CHEN, Xinyang LUO. Analysis method and distribution characteristics of non-uniform slip flow at fluid-solid interface of gas foil bearing[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(11): 127639-127639.

Figures/Tables 15

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参数	数值
轴颈半径R/mm	25.4
轴承套内壁半径R'/mm	25.7
轴承长度L/mm	62
平箔厚度t_p/μm	130
波箔厚度t_B/μm	130
弹性模量E/GPa	207
环境压力P₀/（10⁵ Pa）	1.013
空气动力黏度μ/（10^-5 Pa∙s）	1.84

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Analysis method and distribution characteristics of non-uniform slip flow at fluid-solid interface of gas foil bearing

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