电磁场对软接触结晶器内钢液流动的影响

Effect of Electromagnetic Field on Molten Flow in Soft-Contact Mold

采用非交错网格和适体坐标方法数值模拟了电磁场对软接触结晶器内钢液流动的影响规律。讨论了感应线圈电流强度和电源频率等因素的影响。结果表明 :电磁力能加强结晶器上部熔池的搅拌强度 ,并在上部区域形成一明显的回流区 ,同时还能减小射流的渗入深度 ;加大电流强度 ,能加强钢液的回流和对钢液的搅拌 ,减小射流渗入深度。但电流强度有一个最佳控制范围 ;增加电源频率 ,射流渗入深度增大 ,弯月面附近的紊动能和钢液速度提高。电源频率应控制在 2 0 k

Using non staggered BFC grid system, the effect of electromagnetic field on molten flow pattern in soft contact mold was simulated. Besides, the effects of some parameters on the molten flow, such as electric current and frequency, were discussed. The numerical results showed that the electromagnetic force can enhance the stirring intensity and form distinct circumfluence in upper part of mold. Moreover, the electromagnetic force can decrease molten penetration depth. Increasing electric current can enhance the steel stirring intensity and circumfluence in the mold, but the molten penetration depth is decreased. The magnitude of electric current has an optimal range. The molten penetration depth is increased with increasing of frequency, and the turbulent energy and molten velocity are increased in the vicinity of meniscus; in practice, the frequency about 20 kHz was suggested.