离心式中间包流场的大涡模拟研究

为了研究离心式中间包的流动过程,采用大涡模拟(LES)方法针对3种不同情况,即(a)电磁力加直水口注流;(b)利用钢液的位能使用弯水口注流;(c)电磁力和弯水口注流共同作用,考察了影响旋流强度和中间包内流动结构的工艺参数.结果表明,LES方法可以成功模拟离心式中间包的三维湍流流场.与单纯电磁力或单纯弯水口相比,旋转电磁力和弯水口共同作用时可使水平面的旋流强度显著增强.在原有电磁力作用的基础上,使用弯水口注流可比原流场最大速度值增加约15%~19%.

Large Eddy Simulation for Flow Field in Centrifugal Tundish

To study the flowing process of molten steel in centrifugal tundish, the LES (Large Eddy Simulation) is used to investigate the structure of flow field in three cases, i.e., (a) tapping through a straight stopper nozzle by electromagnetic force; (b) tapping through a curved stopper nozzle by the gravitational potential of molten steel; (c) tapping through curved stopper nozzle by electromagnetic force, in this way, the process parameters due to flow structure in tundish and eddy intensity are both affected by the co-action of electromagnetic force and stopper nozzle. The results show that LES can simulate successfully the 3-D turbulent flow field in centrifugal tundish. In comparison with the tapping depending singly on either electromagnetic force or curved stopper nozzle, the co-action of rotary electromagnetic force and curved stopper nozzle can enhance significantly the horizontal eddy intensity. It is revealed that changing the straight stopper nozzle to a curved one can increase the whirling speed byl5%-19% in flow field if the electromagnetic force remains unchanged.