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复合磁场是金属电磁净化的一种新方法,通过实验和数值模拟,研究由旋转磁场和行波磁场组成的复合磁场电磁净化的效果。装置模型由2组三相交流线圈组构成,通过有限元法分别计算旋转磁场、行波磁场及其复合磁场作用下的电磁体积力、流场分布。结果显示,旋转磁场电磁力使得流场水平转动,下行波磁场电磁力分布驱动外壁容易向下运动,在中心形成向上束流;而复合磁场则兼具两者效果。数模拟数据与实验结果吻合度较好。为了探讨复合磁场电磁净化的机理,计算熔体中第二相夹杂物的体积分布和模拟颗粒在熔体中的运动轨迹。分析结果表明:流场和阿基米德力是影响颗粒运动的2个主要因素;复合磁场相对于单一磁场具有更优越的净化效果。
The composite magnetic field is a new method of metal electromagnetism purification. The effects of the electromagnetic field of the composite magnetic field composed of rotating magnetic field and traveling magnetic field are studied through experiments and numerical simulations. The device model is composed of two groups of three-phase AC coil sets. By using the finite element method, the electromagnetic field forces and the flow field of the rotating magnetic field, the traveling magnetic field and the composite magnetic field are respectively calculated. The results show that the electromagnetic force of the rotating magnetic field makes the flow field rotate horizontally. The distribution of the electromagnetic force of the downlink magnetic field is easy to move downward and the upward beam forms in the center. The composite magnetic field has both effects. The numerical simulation data is in good agreement with the experimental results. In order to investigate the mechanism of electromagnetic field in the composite magnetic field, the volume distribution of the second phase inclusions in the melt and the trajectory of the simulated particles in the melt were calculated. The results show that the flow field and Archimedes force are the two main factors affecting the particle motion. The composite magnetic field has more superior purification effect than the single magnetic field.