圆坯中频电磁软接触连铸结晶器内钢液流动的数值模拟

采用有限元方法模拟了中频电磁场对软接触结晶器内钢液流动的影响规律，讨论感应线圈电流强度和电源频率等因素对结晶器内钢液流动的影响。结果表明：电磁力能加强结晶器内上半部熔池的搅拌强度，并在弯月面区域形成一明显的回流区,同时还能减小钢液射流的渗入深度；增大电流强度，能加强钢液的回流和对钢液的搅拌，减小射流渗入深度，同时也加剧了钢液自由表面的波动，因而电流强度有一个最佳的控制范围；增加电源频率时，射流的渗入深度变化不大，但弯月面附近钢液的紊动能和速度都有所提高，综合考量，本研究中将频率控制在2500 Hz左右。

Numerical Simulation of Molten Flow in Medium-Frequency Soft-Contact Electromagnetic Continuous Casting Mold for Round Billets

Using finite element method, the effect of medium-frequency electromagnetic field on molten flow pattern in electromagnetic 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 show that the electromagnetic force can enhance the stirring intensity and form distinct circurnfluence 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, at the same time, aggravate free surface fluctuation of molten, but the molten penetration depth is decreased. The magnitude of electric current has an optimal range. The molten penetration depth is not changed with increasing of frequency, but the turbulent energy and molten velocity are increased in the vicinity of meniscus, the frequency about 2 500 Hz was suggested in this research.