板坯连铸结晶器内凝固坯壳的三维数值模拟

基于流场和温度场的计算，对断面为1 780 mm×225 mm的板坯结晶器进行数值模拟，考虑3种不同水口条件下，钢液流动对凝固壳的冲刷，计算出凝固壳厚度的三维分布特征，并与二维切片法的计算结果进行了对比。结果表明：有水口时结晶器角部位置凝固壳最大值为约45 mm，宽面和窄面中心凝固厚度壳最大值为24 mm，分别比无水口条件下凝固壳薄1~2 mm；钢液的扩散会使凝固壳在距离结晶器角部300 mm和顶部400 mm的位置形成约深度2.5 mm的凹陷；同时钢液会冲刷整个结晶器窄面的凝固壳，在窄面中心最严重；对比不同的水口，凸底水口冲刷最大，凹底最小。

Numerical simulation of three-dimensional shell thickness in slab continuous casting mold

Based on the calculation of flow flied and temperature field, this article has made a numerical simulation on a slab casting mold that has a section of 1 780 mm×225 mm. In this process, three cases with different nozzles and a case without nozzle are compared to research the effect of flow field to solidification shell. It could be seen that, the maximum shell are about 45 mm at the corner and 24 mm at the center of wide face and narrow face. However, all of these are about 1-2 mm thinner than the case without nozzle. Besides, the flow of liquid steel would form a 2.5 mm sunken, which is 300 mm away from corner and 400 mm below meniscus. The molten steel would scour the whole narrow face, especially at the center. The pointed-bottom nozzle has the smallest shell and recessed-bottom has the largest shell.