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采用数值模拟方法对连铸电磁旋流水口内流体流动和夹杂物碰撞长大行为进行了研究.数值结果表明电磁旋流水口出口处流体流动扩张角与低熔点合金实验值相符.旋转磁场对浸入式水口内壁夹杂物沉积行为存在两个相反的作用:一方面旋转磁场作用加强了水口壁面处钢液的湍流流动,加速了夹杂物在水口内壁的沉积吸附速率;另一方面水口内壁附近夹杂物在旋转磁场产生的旋流作用下易被携带至水口中心,削弱了水口内壁对夹杂物的黏附.在上述两方面因素作用下,钢液区存在一个最佳磁感应强度可使水口内壁夹杂物沉积速率降至最低,从而减轻水口结瘤现象.
Numerical simulation is used to study the fluid flow and inclusions collision growth behavior in continuous casting electromagnetic swirl nozzle.The numerical results show that the fluid flow expansion angle at the outlet of electromagnetic swirl nozzle is in good agreement with the experimental data of low melting point alloy.With the rotating magnetic field, On the one hand, the action of rotating magnetic field strengthens the turbulent flow of molten steel on the nozzle wall surface and accelerates the deposition and adsorption rate of inclusions on the inner wall of the nozzle; on the other hand, the inclusion near the inner wall of nozzle Swirling magnetic field generated by swirling easily carried to the nozzle center, weakened the nozzle wall adhesion of inclusions in the above two factors, the molten steel area there is an optimum magnetic flux density can make the nozzle wall deposition rate of inclusions To a minimum, thereby reducing the nozzle junction phenomenon.