在油气润滑系统中，润滑油以分散的微油滴来为摩擦副供油建立油膜。不同的固-液界面形成不同的微液滴铺展半径。基于此建立了简化的单个微油滴供油弹流润滑模型，模拟了定体积微油滴润滑成膜过程。结果表明：一定体积的微油滴供油时，其润滑效果与其初始铺展半径有关，存在一定范围铺展半径使接触区具有良好成膜能力；最佳铺展半径范围受卷吸速度和润滑油黏度影响。
In oil-air lubrication lubricants in the form of micro oil droplets are supplied to tribo-pairs and build oil film. Different solid-liquid interface leads to different spreading radius of micro oil droplet. With supplying a single micro oil droplet an EHL model is built to numerically simulate the process of building lubricant film. The results show that when the volume of micro oil droplet is unchanged, lubrication effect is related to initial spreading radius of micro oil droplet, and there is a certain range of spreading radius which enables efficient film forming. The desired spreading radius is affected by the entrainment velocity and oil viscosity.
[1] HOHN B R,MICHAELIS K,OTTO H P. Minimised gear lubrication by a minimum oil/air flow rate[J]. Wear,2009,266(3-4):461-467.
[2] DUDOROV E A,RUZANOV A I,ZHIRKIN Y V. Introducing an oil-air lubrication system at a continuous-casting machine[J]. Steel in Translation,2009,39(4):351-354.
[3] JENG Y R,GAO C C. Investigation of the ball-bearing temperature rise under an oil-air lubrication system[J]. Proceedings of the Institution of Mechanical Engineers,Part J:Journal of Engineering Tribology,2001,215(2):139-148.
[4] WU C H,KUNG Y T. A parametric study on oil/air lubrication of a high-speed spindle[J]. Precision Engineering,2005,29(2):162-167.
[5] JIANG S,MAO H. Investigation of the high speed rolling bearing temperature rise with oil-air lubrication[J]. Journal of Tribology,2011,133(2):021101.
[6] MOON J H,LEE H D,KIM S I. Lubrication characteristics analysis of an air-oil lubrication system using an experimental design method[J]. International Journal of Precision Engineering and Manufacturing,2013,14(2):289-297.
[7] 王少鹏. 微量供油条件下润滑油膜特性实验研究[D]. 青岛:青岛理工大学,2014.WANG Shaopeng. Experimental studies on the lubrication films with minimal quantity oil feeding[D]. Qingdao:Qingdao Technological University,2014.
[8] WIJNANT Y H. Contact dynamics in the field of elastohydrodynamic lubrication[D]. Enschede:University of Twente,1998.
[9] DAMIENS B,VENNER C H,CANN P M E,et al. Starved lubrication of elliptical EHD contacts[J]. Journal of Tribology,2004,126(1):105-111.
[10] 谭洪恩,杨沛然,尹昌磊. 特殊供油条件下点接触弹流润滑乏油分析[J]. 摩擦学报,2007,27(4):357-361.TAN Hongen,YANG Peiran,YIN Changlei. Analysis of the oil starvation in EHL point contacts under a special oil-supply condition[J]. Tribology,2007,27(4):357-361.
[11] YIN Changlei,YANG Peiran,TAN Hongen,et al. Thermal elastohydrodynamic lubrication of starved elliptical contacts[J]. Tribology International,2009,42(6):964-974.
[12] CHEVALIER F,LUBRECHT A A,CANN P M E,et al. Film thickness in starved EHL point contacts[J]. Journal of Tribology,1998,120(1):126-133.
