基于速度滑移的液体静压轴承油膜微流动模型
首发时间:2014-03-17
摘要:针对液体静压轴承油膜微流动的速度滑移现象,采用计算流体力学的分析方法,应用Navier速度滑移模型,将近壁面速度滑移边界条件引入到油膜二维流动,建立油膜微流动流速的模型、流量模型和流动控制模型N-S方程。根据建立的模型,对油膜压力分布、油腔流量和轴承承载力进行分析。结果表明,轴颈在轴向方向的速度滑移并不会对轴承润滑性能造成影响;随滑移长度的增加,油腔流量和轴承承载力都呈现出增加的趋势,速度滑移的发生加速油膜在轴承间隙中的流动并提高了轴承的承载能力。
关键词: 液体静压轴承 速度滑移 微流动模型 压力分布 承载力
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The velocity slip model of hydrostatic bearing oil film micro-flow
Abstract:For the micro-scale effect of near surface velocity slip on liquid hydrostatic bearing oil film micro-flow in two-dimension, computational fluid dynamic method and the Navier velocity slip are applied to oil film flow in two dimenssion. The models of oil film velocity, the flow model and flow control model N-S equation are established. According to the established model, the oil film pressure distribution, oil cavity flow and bearing capacity is analyzed. With the increase of slip length, oil cavity flow and bearing increased accordingly. Velocity slip accelerates the oil film micro-flow in the bearing clearance and bearing capacity.
Keywords: hydrostatic bearing velocity-slip model of micro-flow pressure distribution bearing capacity
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