基于DPM与VOF方法轴承腔内滑油瞬态特性对比

为了研究航空发动机轴承腔内油气两相流流动特性，分别采用DPM方法和VOF方法建立了完整的数学模型，并对轴承腔内的两相流动进行了非稳态的数值模拟，获得了不同转速情况下内壁面油膜厚度和滑油体积分数的动态变化过程。通过与实验数据的对比及两种方法计算结果的对比，验证了模型的合理性。进一步计算了增大滑油流量情况下腔内滑油分布。研究结果表明：油膜在轴承腔壁面经历从形成到基本稳定的过程，历时约0.8 s；油膜的生成位置及发展速度受转速影响较大，空气对油膜的剪切作用对油膜分布的均匀性有积极作用。

Motion of Wall Oil Film with Consideration of Oil-gas Coupled Heat and Mass Transfer in Bearing Chamber

To study characteristics of the oil/gas two-phase flow in the aero-engine bearing chamber, complete mathematical models were established based on DPM and VOF methods. Three dimensional un-steady numerical simulations to solve the two-phase flow werecarried out. And unsteady characteristics of oil film thickness and volume fraction of oil were worked out. To verifythe rationality of the mathematical models,the results worked by DPM method were compared with the experiment data. And then the distri-butions of oil with bigger flow rate were calculated. The results show that:The oil film on the bearing chamber wall experiences a development process from the oil film formation to basic stability,less than 0. 8 seconds in this paper. The generated locations and the spreadspeed of the oil film were impacted by ro-tate speed. Moreover,the shear force between air and oil film has the positive effect ofaccelerating the oil film′s spread.