轴心射流收油环内部油气流动特性的数值模拟研究

In order to study the internal oil film migration and flowing characteristics of the under-race lubrication structure，the numerical calculations were carried out by using the VOF（volume of fluid）method for the axis jet oil receiving scoop and the dynamic formation process of oil film on the end face of the scoop is obtained. Based on the analysis of flow field characteristics，the effects of the scoop working conditions and structural parameters on the film shape，oil volume fraction，film velocity and the transportation capacity in the oil supply hole are discussed. Results show that，the oil film migrates in the form of disc at the end face of the scoop，and the oil droplets and the oil belts formed by the broken film edge are thrown to the side wall. The oil film accelerates in the form of crescent shape in the radial hole，and the film thickness on the end face of the scoop decreases with the increase of the rotational speed and increases with the increase of the nozzle oil flow. Increasing the rotational speed reduces the oil retention in the oil supply hole and accelerates the film flow in the hole，and the oil content in the hole ascends with the increase of nozzle flow and decreases with the increase of oil supply hole diameter. The change of nozzle oil flow and hole diameter has little effect on the flim flow velocity in the hole. Increasing the hole diameter and the rotational speed can improve the transportation capacity of the oil supply holes. Increasing the nozzle flow rate reduces the dimensionless oil flow C_q by 40.71% on average，and increasing the diameter increases C_q by 57.14% at most on 8 kr/min. The increase of rotation speed increases C_q by an average of 25.87%.