板坯电磁连铸结晶器内钢/渣界面波动及流动行为的数值模拟

建立了板坯电磁连铸结晶器内钢/渣界面波动行为的三维数学模型，利用数值模拟方法研究了磁场与流场耦合作用下不同工艺参数和电磁参数对结晶器内钢/渣界面波动行为及流场的影响，通过VOF方法对不同条件下的钢/渣界面进行捕捉，讨论不同磁极位置、水口倾角、拉速及线圈电流强度对结晶器内钢/渣界面波动行为和流动的影响。模拟结果表明：电磁制动的施加可以显著降低钢/渣界面波高，减小射流对结晶器窄面的冲击。拉速和水口浸入深度恒定时，磁极位置和水口角度直接影响结晶器内流场形式：当P＝]40 mm时，增加线圈电流可以降低结晶器内钢/渣界面波高和表面流速，从而减小由液面波动引发卷渣的概率；当磁极距离水口较远时（P＝]80 mm），随着线圈电流强度的增大，水口射流的冲击方向向上偏转，引起上回流的流动强度增强，导致钢/渣界面波高增加，增大卷渣发生的概率。

Numerical study on behavior of steel/slag interface and fluid flow in electromagnetic continuous casting mold of slab

A three dimensional mathematical model is used to study the effect of different process parameters and electromagnetic parameters on the behavior of molten steel and liquid slag interface and flow field in electromagnetic continuous casting mold of slab， considering the coupled effects of flow field and electromagnetic field. The volume of fluid (VOF) method is applied to describe the steel/slag interface in the mold. The effects of different pole position， port angle， casting speed and current value of coils on the behavior of steel/slag interface and flow field are discussed. The results show that the application of electromagnetic field can significantly decreased the height of steel/slag interface and reduced the impact strength of jet flow to the narrow face of the mold. For a constant casting speed and submergence depth of SEN， flow field patterns are directly influenced by pole position and port angle. WithP]is 40 mm， the height of steel/slag interface and surface velocity are reduced as increasing of current value and the probability of mould flux entrapment caused by level fluctuation is also decreased. However， with a farther distance between pole and SEN（P＝]80 mm)， the impact direction of jet flow is deflected upward which caused a strongly upward backflow and increased the height of steel/slag interface， and then the probability of mould flux entrapment is increased.