复合电磁场净化铝熔体的数值模拟和实验(英文)

Modeling and Experiments on Electromagnetic Separation of Inclusions from Aluminum Melt under Combined Magnetic Field

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。

Numerical simulation and experiment studies have been conducted to investigate the effect of inclusions separation under combined magnetic field （CMF） generated by synchronous application of a rotating magnetic field （RMF） and a downward traveling magnetic field （TMF）. The experimental setup is constituted by two sets of equidistant coils systems fed by out-of-phase alternating currents. The electromagnetic force field and flow field were calculated via finite-element analysis. CMF combines the rotational effect of RMF and the transport effect of TMF. Volume fraction and particle trajectories were simulated to examine the mechanism of particle separating. Good agreement between experimental and numerical results has been achieved. The flow field and the Archimedes electromagnetic force are the two main factors responsible for particle motion. This type of CMF provides a highly efficient approach at eliminating inclusions.