航空发动机滚动轴承内油气两相流动与温度场的数值模拟

摘要

基于VOF方法和滑移网格技术，研究喷射润滑下主轴承内部压力、温度场及油气体积比随转子转速及滑油流量的变化规律。给出滑油在轴承内的相界面分布，描述轴承内油膜分布及运动。结果表明：轴承内压力和油气两相在轴承内分布不均匀；油液体积分数随转速的升高而降低，随供油量的增加而增加，呈非线性关系；轴承内最高工作温度随主轴转速的增加而增加；轴承润滑效果与供油量有直接的关系，不同的转速下对应不同的最佳供油量。%Based on the volume of fluid(VOF)method and sliding mesh technique,the effect of rotor speed and the oil inlet flow rate on the pressure,temperature field and oil volume fraction in the rolling bearing with spay lubrication were in-vestigated.The film distribution and movement in oil and air interface were showed.The results show that the pressure and the oil-air two-phase flow distribution is not homogenized in the bearing.The oil volume fractionis decreased with the in-crease of revolution speed,and is increased with speeding up the lubrication flow rate nonlinearly.The highest temperature of the bearing is increased with the increase of revolution speed.The effect of the bearing lubrication is directly related with the lubrication flow rate,and an optimum oil feeding rate exists at different rotor speed.