A swirling flow tundish is developed to deeply clean the liquid steel through enhancing the coalescence of inclusions. The swirling flow is generated using the gravitational energy of liquid steel, without any external energy. Inclusions will gather to the center of the swirling flow by centripetal force, due to the density difference between inclusions and liquid steel. Thus, small inclusions can coalesce into larger ones, and then float to the top surface by their self-buoyance. Physical experiments are carried out in a 1/2.5 scale five-strand tundish, to investigate flow characteristics in the swirling flow tundish, compared with that in the tundish with a conventional turbulent inhibitor. Numerical modeling is developed to evaluate the swirling strength of liquid flow in swirling chambers in different sizes, which is related to the effect of inclusion coalescence. The results reveal that swirling chamber in diameter of 700 mm produces the highest swirling flow strength. The swirling system can not only improve the flow field, with a 21.75% reduction of dead volume, but also uniform flow characteristics at each strand. In addition, the swirling chamber inhibits the normal impact of the reversed flow on tundish surface, which is beneficial for remaining a stable slag layer.

中文翻译：

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用于钢水深度清洗的旋流中间包的流动行为建模

开发了旋流中间包，通过增强夹杂物的聚结来深度清洁钢水。涡流是利用钢水的重力能产生的，不需要任何外部能量。由于夹杂物和钢水之间的密度差异，夹杂物会在向心力的作用下聚集到旋流的中心。因此，小的夹杂物可以合并成大的夹杂物，然后通过它们的自浮力漂浮到顶部表面。物理实验在 1/2.5 比例的五股中间包中进行，以研究旋流中间包的流动特性，与带有常规湍流抑制剂的中间包的流动特性进行比较。开发了数值模型来评估不同尺寸旋流室中液体流的旋流强度，这与夹杂物聚结的影响有关。结果表明，直径为 700 mm 的旋流室产生的旋流强度最高。旋流系统不仅可以改善流场，死体积减少21.75%，而且每条流线的流动特性均匀。此外，旋流室抑制了逆流对中间包表面的正常冲击，有利于保持稳定的渣层。