板坯连铸结晶器分区电磁搅拌物理实验和数值模拟研究

Physical Experiment and Numerical Simulation Study of Multi-Mode Electromagnetic Stirring in Slab Continuous Casting Crystallizer

建立了描述板坯连铸结晶器分区电磁搅拌过程电磁场和流场三维数学计算模型,通过物理试验对分区电磁搅拌的数学模型进行了验证。采用数值模拟对分区电磁搅拌下板坯结晶器内的流场进行了计算,考察了不同电磁搅拌模式和搅拌电流作用下的流场结构和分布特征,并通过自由液面的卷渣指数和结晶器内流场均匀性指数对分区电磁搅拌不同模式以及电流强度对铸坯质量的影响作出了定量化评估,综合卷渣指数与均匀性指数,分区电磁搅拌600A600A600A模式下能得到较好的搅拌效果。

In this paper,a three-dimensional mathematical calculation model are established to describe the electromagnetic field and flow field of the slab continuous casting mold and multi-mode electromagnetic stirring process,and the mathematical model of multi-mode electromagnetic stirring is verified by physical experiments.Numerical simulation was used to calculate the flow field in the slab crystallizer under multi-mode electromagnetic stirring,and the structure and distribution characteristics of the flow field under the action of different electromagnetic stirring modes and stirring currents were investigated.The slag entrainment index and flow field uniformity index in the vessel quantitatively evaluates the effects of different modes of electromagnetic stirring and current intensity on the quality of the slab.Combining the slag entrainment index and the uniformity index,the 600A-600A-600A mode of multi-mode electromagnetic stirring can obtain better stirring effect.