轴向喷气对断油高速滚动轴承油膜运动特性影响

Effect of Axial Air Injection on the Kinematic Characteristics of Oil Film of High-speed Rolling Bearing with Oil Interruption

高速轴承断油后轴承腔内的油膜运动特性直接影响着轴承的抗断油能力。为进一步提升现有轴承的抗断油能力,采用VOF和多重参考系模型相结合的方法,系统研究喷气位置、喷气流量以及喷气角度变化对断油轴承腔内流体流动和温度场的影响。结果表明:在研究的喷气流量范围内,喷气流量变化对断油后轴承腔内油膜运动影响较小,而喷气位置和喷气角度对断油后轴承腔内的油膜运动特性具有重要影响,喷气位置在保持架上侧和喷气角度为0°时,可以延缓轴承腔内润滑油的流失,使滑油分布更均匀,从而使其具有更好的润滑冷却性能。

The oil film motion characteristics in the high-speed bearing chamber after oil interruption directly affect the oil breakage resistance of the bearings.In order to further improve the oil breakage resistance of the existing bearings,a combination of VOF and multiple reference system models was adopted to systematically investigate the effects of jet position,jet flow rate,and jet angle variations on the fluid flow and temperature field in the bearing cavity after oil breakage.The results show that,within the range of jet flow studied,the change of jet flow rate has a small effect on the oil film movement in the bearing cavity after oil breakage,while the jet position and jet angle have an important effect on the oil film movement characteristics in the bearing cavity after oil breakage.When the jet position is on the upper side of the cage and the jet angle is 0°,it can slow down the loss of lubricant in the bearing cavity,so that the oil is distributed more uniformly,which results in better lubrication and cooling performance.