摘要
为避免摩擦副间油膜空化影响剪切特性,导致油膜动力传递失稳,对表面织构油膜剪切空化特性进行研究。首先,建立摩擦副间油膜流场的三维CFD模型,对不同织构类型、织构率条件下油膜剪切空化过程进行仿真模拟;其次,分析油膜空化体积分数变化规律及空化形态演变规律;第三,对油液及空化气体进行速度场分析,得到油液及空化气体流动规律;第四,对油膜进行压力场分析,得到油膜及织构凹坑内周向压力分布规律;最后,搭建实验台进行实验验证。研究结果表明:油膜剪切空化现象主要发生在外径处织构区域内,空泡呈细长圆弧状;随着转速及织构率增加,空泡体积增大,空化区域向内径扩散;低织构率下,六面体织构油膜空化体积分数最大,织构率增加,半球织构油膜空化体积分数最大;流场内油液流动和空化气体运动方向一致,油液流动速度大于空化气体运动速度;六面体织构凹坑未对附近流场造成较大扰动,油液及空化气体流速未发生较大变化;空化发生时,不同织构凹坑内压力分布趋势基本保持一致,织构凹坑内油液压力均小于饱和蒸汽压力。
In order to prevent the oil film cavitation between friction pairs from affecting its shear characteristics and leading to the instability of oil film dynamic transmission,shear cavitation characteristics of oil film with surface texture were studied.Firstly,a 3-D CFD model of oil film flow field between friction pairs was established to simulate the oil film shear cavitation process at different texture types and texture ratios.Secondly,variation law of oil film cavitation volume fraction and evolution law of cavitation morphology were analyzed.Thirdly,velocity field of oil and cavitating gas was analyzed to obtain the flow law of oil and cavitating gas.Fourthly,pressure field of oil film was analyzed and the circumferential pressure distribution in oil film and texture pit was obtained.Finally,an experimental platform was built to verify the simulation.The results show that the oil film shear cavitation mainly occurs in the texture region at the outer diameter and the cavitation bubbles are slender arc.With the increase of rotating speed and texture ratio,the cavitation volume increases and the cavitation area diffuses to the inside diameter.At low texture ratio,void volume fraction of hexahedral texture oil film is the largest,the texture ratio increases and the void volume fraction of hemisphere texture oil film is the largest.In the flow field,the direction of oil flow is the same as that of cavitation gas and the velocity of oil flow is higher than that of cavitation gas.Hexahedral texture recesses cause little disturbance to flow field nearby and the velocity of oil and cavitating gas changes little.When cavitation occurs,the pressure distribution trend in different texture pits is the same and the oil hydraulic pressure in texture pits is lower than the saturated steam pressure.
作者
谢方伟
石修伟
孙俊雨
宋新扩
田祖织
刘秀梅
XIE Fangwei;SHI Xiuwei;SUN Junyu;SONG Xinkuo;TIAN Zuzhi;LIU Xiumei(School of Mechatronic Engineering,China University of Mining and Technology,Xuzhou 221008,China;School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China;Huadian Zhengzhou Mechanical Design and Research Institute Limited Company,Zhengzhou 450053,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第12期4314-4324,共11页
Journal of Central South University:Science and Technology
基金
国家自然科学基金联合基金资助项目(U1810123)
国家自然科学基金资助项目(51875559,51675234)。
关键词
旋转摩擦副
织构类型
织构率
空化特性
rotary friction pair
texture type
texture ratio
cavitation characteristic
