连铸结晶器方波电流电磁搅拌电磁场-流场数值模拟

Numerical Simulation of Electromagnetic Field and Flow Field in Square Wave Electromagnetic Stirring of Continuous Casting Mould

采用ANSYS三维有限元数值模拟技术,在320 mm×320 mm方坯连铸结晶器电磁搅拌过程中,对比研究了搅拌器加载方波电流和正弦波电流对铸坯内部电磁场、电磁力及流场的影响。结果表明,在其他参数相同条件下,搅拌器加载方波电流时,铸坯内部也可以产生旋转磁场,且磁场分布较加载正弦波电流更大;同时,产生促使钢液旋转的电磁力,且电磁力峰值较大,表现为一种震荡力效果,而加载正弦波电流产生电磁力相对平稳。加载方波电流对铸坯内部将产生逆时针旋转流场,且有震荡效果,更有助于提高搅拌效率。

The influence of square wave current and sinusoidal wave current loaded by the agitator on the electromagnetic field, electromagnetic force and flow field in the continuous casting mould of 320 mm×320 mm billet was studied by ANSYS three-dimensional finite element numerical simulation. The results show that under the same condition of other parameters, when the stirrer loads the square wave current, the rotating magnetic field can also be generated inside the billet, and the magnetic field distribution is larger than that of the sine wave current. At the same time, the electromagnetic force that causes the liquid steel to rotate is generated, and the peak value of the electromagnetic force is large, showing a kind of shock force effect, while the electromagnetic force generated by loading the sine wave current is relatively stable.The loading of square wave current will produce counterclockwise rotating flow field inside the billet, and the effect of vibration is more conducive to improving the stirring efficiency.