浙江大学学报(工学版)  2021, Vol. 55 Issue (9): 1676-1683    DOI: 10.3785/j.issn.1008-973X.2021.09.009
 机械工程、能源工程

Actuating characteristics and influencing factors of magnetohydrodynamic momentum wheel
Ji-dong LI(),Ying ZHONG,Xing-fei LI*()
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
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Abstract:

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.

Key words: magnetohydrodynamic (MHD)    momentum wheel    Hartmann flow    finite element simulation    Navier-Stokes equation

 CLC: TH 73

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Ji-dong LI,Ying ZHONG,Xing-fei LI. Actuating characteristics and influencing factors of magnetohydrodynamic momentum wheel. Journal of ZheJiang University (Engineering Science), 2021, 55(9): 1676-1683.

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 图 1  MHD动量轮原理示意图 图 2  哈脱曼流动模型速度分布示意图 图 3  导电流体环截面示意图 图 4  简化后装配体截面图 表 1  组件材料参数 图 5  核心部件网格划分方案设计 图 6  流体切面流速分布示意图 图 7  仿真与理论流速随电流变化曲线 图 8  相对偏差随电流变化曲线 图 9  流速随磁感应强度变化曲线 图 10  相对偏差随磁场变化曲线 图 11  流速随电导率变化曲线 图 12  流速随动力黏度变化曲线
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