3种微织构对径向滑动轴承性能的影响

Effects of three types of surface texture on the performances of journal bearing

为揭示表面微织构的几何参数及分布特征对滑动轴承性能的影响,建立具有方形、圆柱形和三角形织构的径向滑动轴承三维有限元模型,在考虑空化效应和紊流影响的前提下,采用基于N-S方程的计算流体力学(CFD)技术对模型进行仿真,对比分析了不同微织构形状、分布位置、密度和尺寸下径向滑动轴承的性能.结果表明:当微织构布置在滑动轴承主要承载区时,可提高滑动轴承的承载能力,降低润滑油流量和摩擦系数;方形微织构对滑动轴承承载能力的提升作用最大;存在一个最优的织构密度、宽度和宽深比,使轴承的承载能力最大.合理的微织构设计可以有效提高滑动轴承的性能.

To reveal the effects of surface texture on the performances of journal bearings, the three-dimensional models of journal bearing with circular, squared and triangular texture are built. The models are simulated with CFD method based on the Navier-Stokes equation considering the cavitation effect and turbulence effect, and the performances of journal bearings with different texture shape, location, density and geometry are analyzed. The results show that, when the surface texture is distributed in load carrying region, the load carrying capacity of journal bearing can be improved, the fluid flow and friction coefficient can be reduced and the bearing with squared texture has a better load carrying capacity. There is an optimal combination of density, width and width-depth ratio of texture for the journal bearing to reach the largest load carrying capacity.