计入浮环传热的增压器浮环轴承润滑分析

Influence of Heat Transfer Through Floating Ring on Lubrication Performance of Floating Ring Bearing

以增压器浮环轴承为研究对象,基于浮环平衡模型、流体润滑模型和热量分配模型,计算不同工况下内层油膜与外层油膜之间传递的热量,并以此作为润滑分析的条件之一,提出了没有热量传递时外膜偏心率的识别方法,并对浮环轴承润滑性能进行研究,主要分析讨论浮环传热在不同外膜偏心率和不同转速下对浮环轴承润滑性能的影响.结果表明,不同外膜偏心率下,浮环传热的情况有较大差异;存在某一外膜偏心率,内膜-浮环-外膜间没有热量传递;转速越高,浮环传热量越多;浮环传热对环速比的影响较大;计入浮环传热后,浮环轴承内外膜温升、内外膜摩擦功耗、外膜端泄流量有较明显变化.

Aimed at the floating ring bearings（FRBs）, the heat transferred between the inner film and outer film was calculated based on the floating ring balance model, the fluid lubrication model, and the heat dissipation model, which was considered as one of the conditions for lubrication analysis. The method to find the outer film eccentricity ratio without heat transfer through the floating ring was proposed. The lubrication performance of FRBs at different outer film eccentricity ratios and rotate speeds was analyzed. The results show that at different outer film eccentricity ratios, the heat transfer is totally different. There exists an outer film eccentricity ratio where there is no heat transfers between the inner film and outer film. The rotation speed affects the quantity of heat transfer between two films. As the rotate speed increases, the quantity of heat increare, too. The heat transfer has an effect on ring speed ratio. When considering the floating ring heat transfer, the temperature rise, the ring speed ratio, and the frictional power consumption change apparently.