速度对表面织构空化效应的影响
首发时间:2016-08-01
摘要:合理的表面织构能够提高摩擦副润滑性能。到目前为止,对表面织构研究主要是实验研究,理论研究还相对较少。对因织构存在而诱发的空化现象的研究多数是实验验证空化现象存在,研究工况参数对空化效应强度的影响还十分有限,本文通过设计和搭建试验台来采集不同工况条件下空化效应图。基于Reynolds方程建立表面织构润滑数值模型。利用差分法及Sommerfeld、Reynolds空化边界条件实现对方程的求解,以探讨表面织构诱发空化现象机理。研究表明,Reynolds空化边界条件更加合理,且只有速度达到一定时才出现空化现象 ,随着运动速度增加,在织构区产生的压力降随之增大,油中气体溢出量及油液汽化量增加,使空化效应增强。
关键词: 表面织构 空化现象 润滑模拟 Reynolds方程
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Effect of velocity on the cavitation effect of surface texture
Abstract:Suitable surface texturing can improve lubrication and friction properties of friction pair. The studies of surface texturing mainly focusing on experiment, and theoretical researches are relatively less up to now. The studies of cavitaition caused by texture only verified the existence of this phenomenon, still didn't consider working parameters influence on cavitaition intensity. Firstly, the cavitation images are collected through experiment to analysis the working parameters effect on cavitation. Then, to investigate the mechanism of surface texturing induced cavitation, surface texturing lubrication numerical calculation model is set up based on Reynolds equation. Difference method and different cavitation boundary conditions are adapted to solve equations. Through experiments, the cavitation phenomena can be observed when the velocity achieving a certain high value. With the increase of velocity the pressure drop at texture area also increase, this causes gas overflow and oil evaporation quantity increase, thus enhancing cavitation intensity.
Keywords: surface texture;cavitation;lubrication simulation;Reynolds equation
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No.4701231115772914****
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