频率对电磁搅拌磁流耦合特性的影响研究

Influence of Frequency on Characteristics of Magnetic Flux Coupling in Electromagnetic Stirring

以两相四极电磁搅拌器为研究对象,通过数值模拟方法研究了频率对电磁搅拌磁场、电磁力及流场的影响。结果表明,金属熔体表面磁场远大于中心处,且磁场随频率的增加而减小,随频率增加电磁力先增加后减小。频率为1 Hz时磁场方向的均一性最佳,且熔体具有最大流速。这主要是由电磁力的大小和分布来决定的。

The influence of frequency on magnetic flux coupling field were studied by the method of numerical simulation. Two-dimensional two-pair-pole finite element model including coil, yoke and metal melt were established. The relationships between frequency and magnetic flux density, electromagnetic body force and flow field were analyzed. The results indicate that the magnetic flux density in the edge is significantly larger than the value in the center and the magnetic flux density decreases with the increase of frequency, electromagnetic force first increases and then decreases with the increase of frequency. When the frequency is 1Hz, the consistency of the magnetic field direction is best, and the maximum flow rate of metal melt can be obtained. This phenomenon can be explained by the distribution of electromagnetic body force.