基于球面转子的悬浮流场数值模拟与实验研究

Numerical Simulation and Experimental Research of Suspension Flow Field Based on Spherical Rotor

提出一种液质悬浮多自由度球形电机模拟转子运动的装置。通过采用“旋转机械,湍流κ-ε”物理场并在有限元软件进行计算分析,包括转子内部的湍流场。主要计算不同深度和不同转速时流体速度、给转子球面的压力、自由液面在此过程中发生的形变、功率等变量。同时,搭建实验平台对动态转子在液体中运动的过程进行模拟,通过设置不同转速计算转子的功率。最后对比数值模拟结果与试验研究结果的差异并进行分析,证明了数值模拟的准确性。结果表明:流体速度分布情况随着球面转子浸入深度而变化,而转速的变化影响流场内点的速度变化;不同深度的球面转子顶端受到的压力大于底端,转速越大,压力也越大;不同深度和不同转速下,自由液面发生明显的形变。以上研究成果为进一步研究分析液质悬浮多自由度永磁球面电机定转子间流体的流动提供参考。

A device to simulate rotor motion of liquid suspension multi-degree-of-freedom spherical motor was proposed.By using the physical field of“rotating machinery,turbulence”and the finite element software,the calculation and analysis were carried out,including the numerical simulation of the turbulent flow field inside the rotor.Variables such as fluid velocity,pressure on the spherical surface of the rotor,deformation of the free liquid surface and power during the process were calculated at different depths and rotating speeds.At the same time,an experimental platform was built to simulate the dynamic rotor motion in liquid,and the power of the rotor was calculated by setting different rotational speeds.Finally,the differences between numerical simulation results and experimental results were analyzed,and the accuracy of numerical simulation was proved.The results show that the distribution of fluid velocity varies with the immersion depth of the spherical rotor,and the change of rotational speed affects the velocity change of the inner point of the flow field;the pressure at the top of the spherical rotor with different depths is greater than that at the bottom;the greater the rotational speed,the greater the pressure;obvious deformation of the free surface occurs at different depths and rotational speeds.The above research results provide reference for further research and analysis of fluid flow between stator and rotor of liquid suspended multi-degree-of-freedom permanent magnet spherical motor.