磁流体动力学动量轮的致动特性和影响因素

Actuating characteristics and influencing factors of magnetohydrodynamic momentum wheel

结合不可压缩流体的纳维−斯托克斯方程和磁流体动力学基本方程,针对电流和电压控制模式下矩形截面环管内金属流体的哈脱曼流动问题建立完整的传递函数模型,深入分析流体中黏滞力项和边界层效应对动量轮输出性能的影响.通过有限元仿真软件COMSOL对流体运动特性和流场分布进行仿真验证,分析电流、磁场和流体特征参数对动量轮输出指标的影响.在电流控制模式下,动量轮的角动量输出标度因数约为9.68×10^(−5)N·m·s/A,可作为动量轮的设计与优化依据.

Based on Navier-Stokes equations for incompressible fluids and magnetohydrodynamics(MHD)basic equations,a complete transfer function model for Hartmann flow of metallic fluid in a rectangular annular tube under current and voltage control mode were built up,and the effects of viscous force and boundary layer on the output performance of the momentum wheel were analyzed.By using the finite element simulation software COMSOL,the fluid motion characteristics and velocity distribution were simulated and verified.The influencing factors of output indexs,including current,magnetic field and characteristic parameters of the fluid,were totally analyzed.In current control mode,the angular momentum output scale factor of the momentum wheel is about 9.68×10^(-5) N·m·s/A,which can provide the basis for the design and optimization of the momentum wheel.