微量供油条件下润滑油液滴的生长与脱附  

Growth and Desorption of Lubricating Oil Droplets under the Condition of Micro Oil Supply

作　　者：豆照良 宋安佳 周刚[2,3] 张韶华 阎红娟[1] 刘峰斌 DOU Zhaoliang;SONG Anjia;ZHOU Gang;ZHANG Shaohua;YAN Hongjuan;LIU Fengbin(School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China;Space Bearing Application Laboratory,Beijing Institute of Control Engineering,Beijing 100094,China;Beijing Key Laboratory for Long-Life Technology of Precision Rotation and Transmission Mechanism,Beijing 100094,China)

机构地区：[1]北方工业大学机械与材料工程学院,北京100144 [2]北京控制工程研究所空间轴承应用试验室,北京100094 [3]精密转动和传动机构长寿命技术北京市重点实验室,北京100094

出　　处：《润滑与密封》2023年第2期83-88,134,共7页Lubrication Engineering

基　　金：国家自然科学基金项目(52005010);北京市自然科学基金项目(3204037);清华大学摩擦学国家重点实验室开放基金项目(SKLTKF19B04)。

摘　　要：润滑油液滴的生长与脱附性能对于微量供油过程和微量润滑效果有重要影响。采用试验和数值仿真相结合的方法,研究微量供油条件下、在重力环境中的润滑油液滴在毛细管出口端的生长与脱附行为,考察毛细管管径和表面润湿特性变化对润滑油液滴脱附性能的影响。结果表明,润滑油液滴的生长与脱附是毛细力、黏性力、表面张力和重力等共同作用的结果;减小毛细管管径或增大润滑油液滴在毛细管表面的接触角,均可有效减弱毛细效应,降低润滑油液的爬移高度和脱附粒径,改善液滴脱附性能;毛细管管径由1.2 mm减小至0.7 mm过程中,液滴脱附粒径减小了4.5%;接触角由5°逐渐增加至90°的过程中,液滴脱附粒径减小了9.3%;通过选用低表面能材料制作微量供油的毛细管可以显著增大接触角。The growth and desorption performance of lubricating oil droplets has an important influence on the micro-lubrication process and the micro-lubrication effect.The growth and desorption behavior of lubricating oil droplets at the capillary outlet under the condition of micro oil supply and gravity environment were studied by means of experiment and numerical simulation,and the effects of capillary pipe diameter and surface wetting characteristics on the desorption performance of lubricating oil droplets were investigated.The results show that the growth and desorption of lubricating oil droplets are the result of capillary force,viscous force,surface tension and gravity,and by reducing the capillary diameter or increasing the contact angle of lubricating oil droplets on the capillary surface,the capillary effect can be effectively reduced,the climbing height and desorption particle size of lubricating oil can be reduced,and the desorption performance of lubricating oil droplets can be improved.When the capillary tube diameter is reduced from 1.2 mm to 0.7 mm,the droplet desorption particle size decreases by 4.5%.While the contact angle is gradually increased from 5°to 90°,the droplet desorption particle size decreases by 9.3%.By using low surface energy materials to make micro-supplied capillaries,the contact angle can be significantly increased.

关 键 词：微量供油 润滑油液滴 毛细管 接触角 脱附性能 

分 类 号：TH117.2[机械工程—机械设计及理论]