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中文摘要：
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.
英文摘要：
A numerical simulation method was applied to investigate the fluid flow as well as the inclusion collision and growth behavior in a swirling flow nozzle induced by a rotating magnetic field during continuous casting.Numerical results indicate that the divergent angle at the submerged entry nozzle（SEN） outlet agrees well with the experimental values of low melting point alloys.The rotating magnetic field has positive and negative effects on the deposition rate of inclusions on the SEN sidewall.On one hand,the turbulence flow near the SEN sidewall enhanced by the rotating magnetic field increases the deposition rate of inclusions on the sidewall;on the other hand,inclusions near the SEN sidewall have a tendency to move towards the SEN center under the rotating magnetic field,which decreases the deposition rate of inclusions on the SEN sidewall.Due to these two paradoxical factors,there is an optimum magnetic induction intensity to minimize the deposition rate of inclusions on the SEN sidewall and the clogging phenomenon can be weakened.
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