板坯二冷段电磁搅拌数值模拟研究

Numerical Simulation of Electromagnetic Stirring in Slab Secondary Cooling Stage

利用有限元分析软件ANSYS对板坯二冷段电磁搅拌电磁场进行数值模拟研究,分析了电流强度、电流频率及浇注断面尺寸对电磁场的影响。模拟结果表明:不同频率和电流强度下搅拌器内磁感应强度分布趋势基本相同,根据磁感应强度分布均匀且相对最大的原则,此搅拌辊最佳电磁搅拌频率为5～6.5 Hz。不同电流强度条件下沿宽度方向距左侧1/3处的磁感应强度波峰比右侧的高近50%,磁感应强度的大小随着电流强度的增大而增大,沿厚度方向中心部位磁感应强度最小,仅仅是靠近铸坯表面的一半。为保证搅拌力较大的位置位于铸坯内部,最佳浇注断面宽度尺寸是800～2000 mm。模拟结果为板坯二冷电磁搅拌的使用奠定了基础。

The numerical simulation research of electromagnetic field of electromagnetic stirring in slab secondary cooling stage was carried out by finite element analysis software ANSYS.The influence of current intensity,current frequency and pouring section sizes on electromagnetic field was analyzed.The simulated result shows that the distribution trend of magnetic induction intensity in the stirrer is basically the same under different frequencies and current intensities.According to the principle of uniform distribution of magnetic induction intensity and relative maximum,the optimum electromagnetic stirring frequency of the stirring roller is 5-6.5 Hz.The peak value at 1/3 width from the left side along the width direction is nearly 50%higher than that from the right side under different current intensities.The magnetic induction intensity increases with the increase of current intensity.Along the thickness direction,the magnetic induction intensity at the center is the smallest,which is only half of that near the surface of billet.The best width of the pouring section is 800-2000 mm to ensure that the position of the larger stirring force is effective located in the billet.The simulation results lay the foundation of the use of electromagnetic stirring in two cold stage of slab.