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通过数值模拟的方法对中频磁场作用下矩形冒口内部钢液的磁场分布规律进行测定,探究了电源频率,感应电流及线圈作用位置对其内部磁场分布的影响。模拟结果表明:钢液内部磁感应强度沿Z向呈“两边小,中间大”分布趋势,磁感应强度峰值出现在中心偏上位置,拐角C处磁感应强度值最大,窄边中心D和宽边中心B次之,钢液中心A位置的磁感应强度值最小;随电源频率的增加,钢液中心位置的磁感应强度峰值不断减小,且频率越高磁感应强度衰减的越严重,但磁场均匀性却不断得到提升;随感应电流的增加,钢液中心位置的磁感应强度峰值几乎呈线性增加,但整体磁感应强度均匀性却在不断降低;随感应线圈位置的上移,钢液中心位置的磁感应强度峰值也随之上移,但其值却略有减少。
The magnetic field distribution of the molten steel in the rectangular riser was measured by numerical simulation. The influence of the power frequency, the induced current and the position of the coil on the internal magnetic field distribution was investigated. The simulation results show that the magnetic induction inside the molten steel is distributed in the direction of “small on both sides and large in the middle” along the Z direction. The peak of magnetic induction appears at the upper center and the magnetic induction intensity at the corner C is the maximum. Followed by center B, the magnetic induction intensity at the center A of the molten steel is the smallest. With the increase of the power frequency, the peak of the magnetic induction intensity in the center of the molten steel continuously decreases, and the higher the frequency, the more serious the magnetic induction decays, With the increase of induction current, the peak value of magnetic flux density in the center of molten steel increased almost linearly, but the overall magnetic flux density uniformity decreased continuously. With the increase of induction coil position, the peak of magnetic flux density in the center of molten steel Also moved up, but its value is slightly reduced.