织构型水润滑轴承动压叠加承载及微动压效应分析  

Investigation on Hydrodynamic Superposition Loading Mechanism and Micro-hydrodynamic Effect of Textured Water-lubricated Bearings

作　　者：李强[1] 王玉君 张硕 许伟伟[2] 王振波[1] LI Qiang;WANG Yu-jun;ZHANG Shuo;XU Wei-wei;WANG Zhen-bo(School of Chemical Engineering,China University of Petroleum (East China), Qingdao 266580, China;School of Pipeline and Civil Engineering,China University of Petroleum (East China), Qingdao 266580, China)

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580 [2]中国石油大学(华东)储运与建筑工程学院,山东青岛266580

出　　处：《表面技术》2019年第5期180-187,共8页Surface Technology

基　　金：国家自然科学基金(51506225);山东省重点研发计划(2018GHY115018);中央高校基本科研业务费专项(18CX02129A);中国石油大学(华东)研究生创新工程(YCX2019040;YCX2018030)~~

摘　　要：目的提高水润滑轴承承载力,探究织构型水润滑轴承的承载机理。方法采用计算流体力学(Computational Fluid Dynamics, CFD)方法建立三维织构型水润滑滑动轴承和二维织构型平行接触副模型,分别从宏观和微观角度对表面微织构承载机理进行研究。结果宏观角度上,在保证织构结构参数不变时,随着织构分布由液膜最高压力区下游向上游移动,水润滑轴承承载力呈现出先上升后下降的趋势,织构处产生微动压现象,逐渐上升的压力脉动趋势使轴承承载力上升,但原动压区逐渐变成以织构为中心的点状区域,使得承载区面积下降。微观角度上,随着织构向入口方向移动,压力分布整体向左移动,当Re>1时,随着惯性效应的增强,压力分布整体上移,考虑空化效应时,织构处压力降低被限制。结论宏观角度上,微动压效应与原动压效应之间的非同向叠加效应决定了织构型水润滑滑动轴承的承载能力,表现为以液膜最高压力区为分界,织构区域位于其上游时,轴承承载力上升,反之,承载力下降。微观角度上,织构的微动压效应主要通过入口卷吸效应、空化作用以及惯性作用产生。The work aims to improve the loading capacity of the water-lubricated bearing and explore the bearing mechanism of textured water-lubricated bearings. The three-dimensional textured water-lubricated journal bearing and the two-dimensional textured parallel contact model were established respectively by Computational Fluid Dynamics(CFD) to analyze the surface micro-textured bearing mechanism from the macro and micro perspectives. From the macroscopic view, the loading capacity increased firstly and then decreased as the textures zone moved to the downstream from upstream when the structure parameters kept unchanged. The micro-hydrodynamic effect occurred because of the textures, resulting in an upward pressure pulsation trend which improved the loading capacity. However, the primary pressure region gradually became a dotted area with the textures as centers, thus resulting in the decrease of the bearing area. From the microscopic view, as the texture moved toward the inlet, the pressure distribution moved to the left as a whole. When Re> 1, the pressure distribution moved upward as a whole with the increase of inertia effect, and the pressure reduction at the texture was limited when the cavitation effect was considered. From the macro view, the non-homodromous hydrodynamic superposition action between the micro-hydrodynamic effect and the primary pressure effect determines the loading capacity of the textured water-lubricated journal bearing. The high pressure area of the original liquid film is used as the boundary. When the texture area is in the upstream, the bearing capacity rises and on the contrary declines. From the micro view, the micro-hydrodynamic pressure effect is caused by the surface micro-texture mainly through the inlet suction effect, cavitation effect and inertia effect.

关 键 词：水润滑轴承 表面织构 计算流体力学 空化 微动压 承载力 

分 类 号：TH133[机械工程—机械制造及自动化]