中心进气转静系转盘风阻扭矩数值模拟

Numerical simulation of friction torque of rotating disc for rotor-stator system with central inflow

采用计算流体力学(CFD)商业软件CFX从流动参数及几何结构两个方面对中心进气转静系盘腔内转盘风阻扭矩特性进行了数值模拟研究,同时搭建一个转盘风阻扭矩实验台测量自由盘风阻扭矩.中心进气转静系转盘风阻扭矩与经典经验公式进行了对比,结果表明:利用数值模拟方法,得到的无量纲扭矩系数与经典经验关系式计算得到的数据总体相差小于10%,利用湍流参数来表征转盘转速以及叠加流流量,对于分析转盘风阻扭矩非常便利.利用湍流参数定量分析时需注意叠加流以及转速的量级同样影响着风阻扭矩的数值.几何结构对于风阻扭矩也有影响,但相比流动参数影响较小.

In order to investigate the friction torque performance of rotating disc for rotor-stator system with central inflow,numerical simulation was conducted by using computational fluid dynamic（CFD）commercial software CFX in consideration of flow parameters and geometric structure respectively.A test rig for the friction torque of rotating disc was developed to test the friction torque of free disc.The numerical simulation results were compared with the previous empirical associated correlation for the friction torque of rotating disc for rotor-stator system with central inflow.The results show that compared with the previous empirical associated correlation,the difference of dimensionless the moment coefficient is within 10%.It is convenient to use turbulent parameter which represents the rotating speed and superimposed flow to analyze the friction torque of the rotating disc.For a given value of the turbulence parameter,the magnitudes of the rotating speed and superimposed flow have effect on the friction torque.Compared with the flow parameters,geometric parameters have smaller influence on friction torque.