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针对铸坯断面为1 500 mm×90 mm的漏斗型结晶器,在拉速为5 m/min的条件下,通过耦合湍流模型、多相流模型以及电磁制动模型,计算了电磁场作用下结晶器内流体流动与液面波动特征。数值模拟结果表明,应用电磁制动能显著改变结晶器内钢液流动行为,使结晶器内流场分布更加均匀。此外,当施加的磁场强度为0.2和0.3 T时,结晶器最大液面波动高度从未施加电磁制动时的15 mm减小至9.2 mm和2.33 mm。综合考虑到电磁制动效果与生产成本,合理的磁场强度应控制在0.2～0.3 T。
Aiming at the funnel mold with a cross section of 1 500 mm × 90 mm, the effects of the electromagnetic field were calculated by coupling the turbulence model, the multiphase flow model and the electromagnetic brake model under the condition of 5 m / min of pulling speed Fluid Flow and Fluctuation in Fluids. The numerical simulation results show that the application of electromagnetic brake can significantly change the flow behavior of molten steel in the mold and make the distribution of flow field in the mold more uniform. In addition, when the applied magnetic field strength is 0.2 and 0.3 T, the maximum height fluctuation of the mold decreases from 15 mm without electromagnetic braking to 9.2 mm and 2.33 mm. Taken into account the effect of electromagnetic braking and production costs, reasonable magnetic field strength should be controlled at 0.2 ~ 0.3 T.