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建立了描述电磁制动(EMBr)下CSP漏斗形结晶器开浇过程暂态流动现象的三维数学模型,研究不同磁场强度对开浇过程中结晶器内流场影响。利用流体体积方法(VOF)捕捉钢液-空气界面。采用动网格模型实现引锭杆的移动。研究结果表明:电磁场可显著抑制钢液湍流流动,降低引锭杆启动瞬间的弯月面波动;开浇过程电磁制动的使用可改善拉坯过程中结晶器内钢液流态;电磁制动的使用可将自由稳定时间提前约10s;使用电磁制动可明显减轻漏斗形结晶器内钢液偏流现象。
A three-dimensional mathematical model describing the transient flow phenomenon of CSP funnel-shaped mold casting under electromagnetic brake (EMBr) was established to study the influence of different magnetic field intensities on the flow field inside the mold during cast casting. Use the Fluid Volume Method (VOF) to capture the molten steel-air interface. The moving grid model is used to realize the movement of the dummy bar. The results show that the electromagnetic field can significantly inhibit the turbulent flow of molten steel and reduce the meniscus fluctuation at the starting moment of the dummy bar. The use of electromagnetic brakes in the casting process can improve the fluid flow in the mold during the casting process. The use of the free stabilization time can be advanced about 10s; the use of electromagnetic brake can significantly reduce the funnel-shaped mold in the molten steel bias phenomenon.