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为了获得航空发动机轴承腔内壁油膜运动特性,对油滴在轴承腔内运动、油滴/壁面相互作用及油膜的流动进行研究,建立了一套完整的数学计算模型,利用Star-CD商业软件对油膜的运动进行非稳态数值计算,在验证计算模型合理性的基础上,对不同主轴转速下轴承腔两相流动的运动特性进行研究。研究表明:油膜在轴承腔壁面经历从形成到基本稳定的过程。在油膜流动稳定的状态下,随转速的增加,壁面油膜厚度呈减小趋势,而壁面油膜速度却呈增加趋势,油滴撞击油膜动量随转速的增强是主要因素。此外,空气对油膜的剪切作用对油膜流动的加速产生积极作用,且转速越高越显著。
In order to obtain the motion characteristics of oil film on the inner wall of aeroengine bearing cavity, the motion of oil droplet in the bearing cavity, the interaction of oil droplet / wall and the flow of oil film were studied. A complete mathematical model was established. By using Star-CD commercial software Based on the verification of the rationality of the calculation model, the motion characteristics of the two-phase flow in the bearing cavity under different spindle speeds are studied. The research shows that the oil film undergoes the process from formation to basic stabilization in the bearing cavity wall. With the increase of rotational speed, the thickness of wall oil film decreases while the oil film velocity of wall increases with the increase of rotational speed, and the momentum of oil drop colliding with oil film is the main factor. In addition, the shearing effect of air on the oil film has a positive effect on the acceleration of the oil film flow, and the higher the speed, the more significant.