钢连铸电磁搅拌工艺中流场的数值模拟

Numerical modeling of flow fields in the continuous casting process of steel under electromagnetic stirring

利用旋转磁场特征变换模型方程并结合边界更新法,与k-ε湍流模型耦合计算了交变电磁场作用下连铸方坯内的流场.结果表明:电磁力使得钢液在水平方向形成旋转流动,能够降低向下过高的流速并增强回流;从搅拌区域垂直中心向下,水平旋转流动的速度逐渐变小.钢液旋转流速随电源电流和频率的增大而提高,并且在水平面上呈单峰值分布,在近壁面处最大.

Combined with the transformed model equation of rotating magnetic fields and the boundary renewal method, the k-ε turbulent model was used to analyze the flow field in the continuous casting process of steel under the action of a rotating magnetic field. The electromagnetic field makes molten steel whirl in the horizontal plane, decreases the downward velocity and speeds up the vortex. The horizontal rotating velocity decreases gradually downwards from the vertical center of the stirring area. The rotating velocity increases with the increasing of both electric current and frequency, with a distribution of single peak values on the horizontal plane and the maximum occurs near the wall.