电磁制动下钢液射流及钢-渣界面波动行为的数值模拟

建立了描述全幅一段电磁制动作用下结晶器内钢液射流及钢-渣界面波动行为的数学模型,采用数值模拟方法研究了不同电磁参数对结晶器内钢液射流及其引起的钢-渣界面波动行为的影响,分析了磁感应强度及水平磁极与浸入式水口之间距离变化对结晶器内钢液射流行为和钢-渣界面波动行为的影响。结果表明,当全幅一段电磁制动稳恒磁场同时覆盖射流冲击区域、上返流和下返流区域时(D=20mm),电磁制动的施加可以有效控制钢液射流结构,降低上返流和下返流钢液流速,稳定钢-渣界面波动;当电磁制动水平磁极与浸入式水口垂直距离较远时(D=220mm),增大磁感应强度不能对结晶器内上返流区域钢液流速进行抑制,不利于钢-渣界面波动的稳定,增大卷渣发生几率。

Numerical Simulation on Behavior of Molten Steel Jet Flow and Steel/Slag Interface Fluctuation with EMBR Ruler

A mathematical model was established to describe the behavior of molten steel jet flow and steel/slag interface fluctuation with EMBR ruler.The effects of different electromagnetic parameters on the behavior of molten steel jet flow and steel/slag interface fluctuation were investigated by numerical simulation.The influence of magnetic induction intensity,the change of distance between the level electromagnetic pole and submergence depth of SEN was analyzed on the behavior of molten steel jet flow and steel/slag interface fluctuation.The results reveal that the application of EMBr ruler can control effectively the molten steel jet flow,and reduce the velocity of upward backflow and downward backflow as well as stabilizing the fluctuation of molten steel and liquid slag interface when the electromagnetic field of EMBr ruler coveres the jet flow impact region,upward backflow and downward backflow zone(D=20 mm)at the same time.For a long distance between the level electromagnetic pole and submergence depth of SEN(D=220 mm),the molten steel velocity of upward backflow in the mold can′t be depressed by increasing the magnetic induction intensity.A higher magnetic induction intensity isn’t conductive to stabilize the fluctuation of molten steel and liquid slag interface,and the probability of slag entrapment is increased.