Liu Ren, Wang Xiao-Li, Zhang Xiao-Qing
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J Tribol. 2012 Apr;134(2):222011-222017. doi: 10.1115/1.4006359. Epub 2012 Apr 11.
The effects of gas-rarefaction on dynamic characteristics of micro spiral-grooved-thrust-bearing are studied. The Reynolds equation is modified by the first order slip model, and the corresponding perturbation equations are then obtained on the basis of the linear small perturbation method. In the converted spiral-curve-coordinates system, the finite-volume-method (FVM) is employed to discrete the surface domain of micro bearing. The results show, compared with the continuum-flow model, that under the slip-flow regime, the decrease in the pressure and stiffness become obvious with the increasing of the compressibility number. Moreover, with the decrease of the relative gas-film-thickness, the deviations of dynamic coefficients between slip-flow-model and continuum-flow-model are increasing.
研究了稀薄气体对微螺旋槽推力轴承动态特性的影响。采用一阶滑移模型对雷诺方程进行修正，并基于线性小扰动法得到相应的扰动方程。在转换后的螺旋曲线坐标系中，采用有限体积法（FVM）对微轴承的表面区域进行离散。结果表明，与连续流模型相比，在滑移流区域，随着可压缩数的增加，压力和刚度的降低变得明显。此外，随着相对气膜厚度的减小，滑移流模型与连续流模型之间动态系数的偏差增大。
