【摘要】 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。更多还原

【Abstract】 A three-dimensional mathematical model was established to investigate the transient flow phenomena of molten steel during the casting start period with electromagnetic brake( EMBr). An algorithm of VOF has been employed to simulate the air / steel interface. Use dynamic mesh to control the movement of dummy bar. The results show that,the electromagnetic field can significantly restrain the turbulent flow of molten steel and the fluctuation of the surface at the time of the dummy bar moving; the EMBr can optimize the flow pattern in the mold; the stabilization of the free surface may come earlier by 10 seconds with EMBr; the EMBr provides a positive effect to reduce the flow deviation of molten steel in the funneltype mould.更多还原