航空发动机轴承腔内油气两相分布数值计算

主轴承腔是航空发动机润滑系统油气两相流的重要区域,了解滑油及密封空气在腔内的分布预测对于认知腔内两相流动具有重要的意义。利用VOF数值计算模型对某航空发动机轴承腔简化模型内油气两相流进行了数值计算,定义无量纲数β^＋用来分析腔内两相分布。计算结果与现有实验数据符合良好。给出了滑油在腔内的相界面分布,描述了腔内的油膜分布及运动,并且分析了无量纲数β＋在腔内周向分布及出口处随着转速及滑油进口流量的变化规律。

Numerical simulation of two-phase air/oil distribution in aero-engine bearing chamber

Bearing chamber as the interface of oil and the secondary air flow is one of the most important components in aero-engine lubrication system.Based on this,well understanding the oil and air distribution is necessary for chamber.two-phase flow.a two-phase flow in a simplified bearing chamber condition is simulated by VOF numerical model,a dimensionless number β^＋ has been defined which is used to indicates the distribution of two-phase.The simulation results are well in line with the existing experimental data.The film distribution and movement in oil and air interface have been showed.The effect is also investigated how the dimensionless number β＋ is affected by rotor speed and lubrication oil flow rate.