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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2 500 Hz左右。
The effect of medium frequency electromagnetic field on the flow of molten steel in soft contact mold was simulated by finite element method. The influence of current intensity and power frequency of induction coil on the flow of molten steel in mold was discussed. The results show that the electromagnetic force can enhance the stirring intensity of the molten pool in the upper half of the mold and form a clear recirculation zone in the meniscus area, meanwhile reduce the penetration depth of the molten steel jet; increase the current intensity, Strengthen the backflow of molten steel and the mixing of molten steel to reduce the jet penetration depth, but also exacerbated the free surface fluctuations of liquid steel, so the current intensity has an optimal control range; increase the frequency of power supply, jet penetration depth changes However, the turbulent energy and velocity of the liquid steel near the meniscus have been increased. Based on the comprehensive consideration, the frequency of this study is controlled at about 2 500 Hz.