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建立了板坯结晶器电磁搅拌过程电磁场与流场计算的三维数学模型,采用SIMPLER方法对2对极和4对极条件下的电磁场与流场进行了数值求解。结果表明:磁感应强度B和电磁力F都呈现出关于结晶器中心对称的规律;结晶器两侧每一对N、S极之间的水平面内,电磁力都呈现圆周状分布的规律;板坯宽面边缘的电磁力较大,而板坯窄面边缘和中心区域的电磁力较小;与4对极相比,2对极产生的磁感应强度和电磁力大,钢液的流速大,搅拌强度大;无结晶器电磁搅拌时,铸坯边缘的纵断面的流场主要分成四个回流区;而有结晶器电磁搅拌时,左侧的两个回流区基本消失,右侧两个回流区减小。
The three-dimensional mathematical model of the electromagnetic field and flow field in the electromagnetic stirring process of slab mold was established. The electromagnetic field and flow field in two pairs of poles and four pairs of poles were numerically solved by the SIMPLER method. The results show that the magnetic induction B and the electromagnetic force F all show a regular pattern about the center of the mold. The electromagnetic force in the horizontal plane between each pair of N and S poles on both sides of the mold shows a circular distribution. The electromagnetic force of the wide-faced edge is larger, while the electromagnetic force of the narrow-edge edge and the central area of the slab is smaller. Compared with the four opposite poles, the magnetic induction intensity and the electromagnetic force generated by the two opposite poles are large and the flow velocity of the molten steel is large. Strength and strength. When there is no mold electromagnetic stirring, the longitudinal flow field at the edge of the slab is mainly divided into four recirculation zones. When there is mold electromagnetic stirring, the two recirculation zones on the left basically disappear, and the two right recirculation zones Decrease