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采用多孔介质模型描述流体在透气砖内的流动,并结合欧拉两流体模型描述容器内的气液两相流动,以底吹中间包为例,采用数学模拟的方法,研究了多孔介质模型对气泡逃逸速度及中间包内流体流动特性计算结果的影响。结果表明,不采用多孔介质模型计算的气泡的逃逸速度比采用多孔介质模型大,且随着底吹流量的增加,偏差加大。由于气泡进入钢液的初始速度的差异使中间包内钢液的流场不同,不采用多孔介质模型时对中间包内停留时间的计算偏长。水模实验研究表明,采用多孔介质模型描述流体在透气砖内的流动与实验结果更吻合。
The porous medium model is used to describe the flow of fluid in the brick and the Euler two-fluid model is used to describe the gas-liquid two-phase flow in the container. Taking the bottom tundish as an example, the mathematical model is used to study the porous media model. Bubble escape velocity and fluid flow characteristics in tundish. The results show that the escape rate of bubbles calculated without porous media model is larger than that of porous media model, and the deviation increases with the increase of bottom blowing flow rate. Due to the difference of the initial velocity of the bubble entering the molten steel, the flow field of molten steel in the tundish is different. When the porous medium model is not used, the calculation of the dwell time in the tundish is too long. Water model experiments show that the use of porous media model to describe the fluid flow in the brick is more consistent with the experimental results.