Analysis Of Two-phase Flow And Coupled Heat Transfer Of High Speed Ball Bearing Under Race Lubrication

With the continuous increase of the spindle speed of the aeroengine,the main bearing pressure of the engine is the large aperture,high speed and heavy load.High speed angular contact ball bearings can meet the requirements of the current work,therefore,the cooling and lubrication of this type of bearings put forward higher requirements.With the continuous increase of the DN value of aeroengine bearing,the high-speed moving air forms a strong high-pressure zone inside the bearing,which makes it difficult for the jet lubricating oil to enter into the bearing,thus reducing the lubrication efficiency of jet lubrication.In order to solve the lubrication problem of bearings with high DN value,many scholars have proposed a kind of under-ring lubrication method superior to jet lubrication.In order to solve the problem of lubrication under high speed ball bearing ring,the temperature field and two-phase flow field of M50 all-steel ball bearing with an aperture of 150 mm were simulated by VOF model and MRF model.By comparing with the experimental data in the literature,the accuracy of the numerical method is verified.On this basis,the influence of working conditions on the temperature field and two-phase flow field under the lubrication mode of high speed ball bearing ring is investigated.The results show that :(1)the rotating speed has an effect on the temperature field of the bearing and the internal two-phase flow field.The rotating speed is positively correlated with the overall temperature of the bearing,positively correlated with the disturbance degree of the internal flow field,negatively correlated with the axial and circumferential temperature gradients of the inner ring of the bearing,and negatively correlated with the oil volume fraction of the bearing.(2)the oil supply has an impact on the temperature field of the bearing and the internal two-phase flow field.The oil supply is negatively correlated with the overall temperature of the bearing and the axial temperature gradient of the inner ring of the bearing.The oil supply is positively correlated with the oil volume fraction inside the bearing and with the disturbance degree of the internal flow field.(3)the load has a great influence on the temperature field of the bearing.The load is positively correlated with the overall temperature of the bearing,but the load has a small influence on the two-phase flow field inside the bearing.(4)the rotation speed is negatively correlated with the penetration rate of lubricating oil,while the oil supply is positively correlated with the penetration rate of lubricating oil;(5)when ball rotation is considered,the bearing speed is positively correlated with the bearing temperature,positively correlated with the penetration rate of lubricating oil,negatively correlated with the oil volume fraction inside the bearing,and negatively correlated with the disturbance degree of internal flow field;(6)when considering ball rotation,the oil supply is positively correlated with the oil volume fraction inside the bearing,positively correlated with the penetration rate of lubricating oil,and negatively correlated with the bearing temperature.