考虑空化的倾斜织构表面摩擦学性能CFD分析

CFD Analysis of Tribological Properties of Inclined Texture Surface with Consideration of Cavitation

为了研究倾斜织构表面的摩擦学性能,建立单微孔倾斜织构的二维计算模型并且考虑空化效应的影响。利用CFD方法模拟不同倾斜角、油膜厚度和织构深度条件下空化面积、织构表面压力分布和油膜承载力的变化情况。结果表明:与平行织构表面不同,在倾斜织构表面中,与不考虑空化相比,考虑空化效应时油膜承载力不一定更大,在倾斜角一定时,与油膜厚度有关;织构深度会影响承载性能,每个计算模型都会存在一个最优织构深度使得承载力最大,且最优承载力会随倾斜角的增大而增大,随油膜厚度的增大而减小;最优承载力增长率的变化趋势与空化效应有很大关系,空化效应较强时,最优承载力增长率会随着倾斜角的增大而减小,空化效应较弱时,最优承载力增长率会随着倾斜角的增大而增大。

To study the tribological properties of inclined textured surface,a two-dimensional calculation model for single micro-porosity texture was established and the cavitation effect was taken into account.CFD methods were used to simulate the change of cavitation area,textured surface pressure distribution and oil film bearing capacity under different conditions of tilt angle,film thickness and texture depth.The results show that,different from the parallel textured surface,for the inclined textured surface,the oil film bearing capacity of cavitation is not necessarily larger than that of non-cavitation,and the oil film bearing capacity is related to the oil film thickness when the tilt angle is fixed.The depth of texture affects the bearing capacity,each calculation model has an optimal depth of texture to maximize the bearing capacity,and the optimal bearing capacity is increased with the increasing of the tilt angle and decreased with the increasing of the oil film thickness.The change trend of the optimal bearing capacity growth rate is closely related to the cavitation. When the cavitation effect is obvious,the optimal bearing capacity growth rate will decrease with the increasing of the tilt angle,and when the cavitation effect is weak,the optimal bearing capacity growth rate will increase with the increasing of the tilt angle.