楔形织构对流体动压润滑性能的影响

Influence of Wedge Texture on Hydrodynamic Lubrication Performance

采用基于N-S方程的CFD方法对流体动压润滑状态下的表面织构进行数值模拟,分析了不同几何参数下楔形结构对表面织构动压性能的影响。结果表明:几何参数对织构的动压性能有着显著影响,对称及楔形收敛织构的动压性能随深度比的增大呈先增大后减小趋势,随面积率的增大而增大;而相反的楔形结构使织构表现出相反的动压性能,因此当深度比增大到一定程度后,楔形发散织构表现出较楔形收敛织构更优的动压性能。此外通过正交模拟得出,相同工况下,对织构动压性能影响的主次因素依次为表面形状>面积率>截面形状>深度比,对负压幅值影响的主次因素依次为深度比>截面形状>表面形状>面积率,为织构的设计优化提供参考。

TheCFD method based on the N-S equation is used to numerically simulate the surface texture under hydrodynamic lubrication,and the influence of the wedge structure on the surface texture dynamic pressure performance under different geometric parameters is analyzed.The results show that geometric parameters have a significant impact on the dynamic pressure performance of the texture.The dynamic pressure performance of the symmetrical and wedge-shaped convergent textures first increases and then decreases with the increase of the depth ratio,and increases with the increase of the area ratio.The opposite wedgeshaped structure makes the texture show the opposite dynamic pressure performance,so when the depth ratio increases to a certain extent,the wedge-shaped divergent texture shows better dynamic pressure performance than the wedge-shaped convergent texture.In addition,the orthogonal simulation results show that under the same working conditions,the primary and secondary factors affecting the dynamic pressure performance of the texture are surface shape>area ratio>section shape>depth ratio,and the primary and secondary factors affecting the negative pressure amplitude are in sequence depth ratio>cross-sectional shape>surface shape>area ratio,which provides a reference for texture design optimization.