高速角接触球轴承喷油润滑雾化分析

以角接触球轴承为研究对象，为分析喷射润滑油液在环间高速气流作用下的雾化情况，建立了轴承环间气液两相流仿真模型，采用FLUENT流体计算软件对高速角接触球轴承进行模拟分析计算，探讨在相同时刻不同转速、不同喷射角度等条件下油液颗粒直径大小的变化，以及在不同时刻索太尔平均直径(SMD)的变化趋势。结果表明：随着润滑油的穿透过程，腔内大粒径油液所占比例逐渐减少，小粒径比例增高；随着转速的增大，进入腔内油量也会随之减少，受环间气流涡的影响，迅速使油液液滴发生碎裂，使雾化加剧，颗粒直径减小，则会使SMD减小，不利于轴承的润滑；不同喷射角度条件下，15°的喷射角度轴承腔内的大粒径占比较大。

Oil atomization analysis of jet lubrication for high speed angular contact ball bearing

Angular contact ball bearing was taken as investigation object and FLUENT fluid calculation software was used to establish a simulation model of gas-liquid two-phase flow between bearing rings, so as to analyze the atomization of injected lubricating oil liquid under the action of high-speed airflow between rings. The change of oil particle diameter was discussed under the conditions of different rotating speeds and different injection angles at the same time. And the change trend of Sauter mean diameter (SMD) at different times was also discussed. Results showed that with the penetration of lubricating oil, the proportion of oil with large particle size in the cavity decreased gradually, while the proportion of oil with small particle size increased. With the increase of the rotating speed, the amount of oil entering the cavity would also decrease. Influenced by the air vortex between the rings, the oil droplets would disintegrate rapidly, which would intensify the atomization and reduce the particle diameter, thus reducing SMD and affecting the bearing lubrication. Under the condition of different injection angles, the proportion of large particle size in the bearing cavity with the injection angle of 15° was relatively large.