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为研究航空发动机轴承腔油气两相流动及内壁面油膜运动特性,建立了腔内油滴-空气双向耦合数学模型和内壁面油膜传热传质运动模型,并对油气流场及不同供油流量下油膜的流动进行计算,获得腔内两相流场特性及内壁面油膜厚度、周向速度分布。结果表明:在所计算工况中,双向耦合计算流场与单向计算结果至少相差10%,因而不可忽略油滴对空气流动的影响;腔内滑油蒸汽质量分数低于0.05%,则空气-油滴之间粘性力产生的拖曳作用是影响流场的主要因素;随着供油流量的增加,油膜厚度及周向速度都呈增加趋势,但与滑油流量的增幅并不成正比。与国外试验数据的对比证明所建数学模型合理且有效。
In order to study the gas-oil two-phase flow in the bearing cavity of the aero-engine and the motion characteristics of the oil film in the inner wall, a mathematical model of droplet-air two-way coupling in the cavity and heat and mass transfer motion model of the oil film in the inner wall were established. The flow of the oil film is calculated, the characteristics of the two-phase flow field in the cavity and the thickness of the oil film on the inner wall and the circumferential velocity distribution are obtained. The results show that in the calculated conditions, the calculated two-way coupling flow field is at least 10% different from the one-way calculation result. Therefore, the influence of oil droplets on the air flow can not be neglected. When the mass fraction of the lubricating oil in the cavity is less than 0.05% - The drag effect caused by the viscous force between oil droplets is the main factor affecting the flow field. With the increase of oil flow rate, the oil film thickness and circumferential velocity show an increasing tendency, but not proportional to the increase of oil flow rate. The comparison with foreign experimental data proves that the mathematical model built is reasonable and effective.