特厚板坯连铸二冷区电磁搅拌数值模拟  

Numerical simulation of electromagnetic stirring in secondary cooling zone of extra-thick slab continuous casting

作　　者：祝宝轩 刘坤 杨滨 ZHU Baoxuan;LIU Kun;YANG Bin(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《辽宁科技大学学报》2024年第3期166-173,184,共9页Journal of University of Science and Technology Liaoning

基　　金：辽宁科技大学校基金资助项目(2020QN02)。

摘　　要：电磁搅拌模式可以改变钢液内磁场分布以及钢液在铸坯内流动形态,进而影响铸坯坯壳分布。本文采用数值模拟方法分析特厚板坯二冷区电磁搅拌模式对板坯内流流动特性的影响。数值计算结果表明,不同的搅拌方式发生内卷流动的位置不同,双环式与双碟式搅拌时,卷流发生在靠近板坯下边界的区域,三环式的卷流发生在搅拌辊所处的位置。拉坯速度对于三环式的影响最小,拉速0.5 m/min工况与拉速0.7 m/min工况的平均速度之差只有0.005 m/s。综合对比三种搅拌模式,三环式的整体流场分布较为合理。随着搅拌辊距离的增大,搅拌形成的涡流中,最上方的涡流区和最下方的涡流区越来越小,而中间的涡流区则相应增大。The mode of electromagnetic stirring can alter the distribution of the magnetic field within the molten steel,as well as influence the flow pattern of the liquid steel within the slab,which in turn affects the slab's shell distribution.Numerical simulation methods were utilized to chart the effects of different electromagnetic stirring modes on the internal fluid dynamics of the slab during the secondary cooling phase for extrathick slabs.The findings indicate that the location where vortex flow is generated varies depending on the stirring method used.In both the double-disc and double-ring modes,vortex flow appears near the lower boundary of the slab,whereas in the tri-ring mode,it occurs at the location of the stirring roller.In terms of casting speed,the tri-ring mode shows the least sensitivity,with the variation in average speed between casting speeds of 0.5 m/min and 0.7 m/min being a mere 0.005 m/s.Upon a comprehensive comparison of the three stirring modes,it becomes evident that the overall fluid field distribution is most balanced in the tri-ring mode.Furthermore,as the distance between the stirring rollers widens,the uppermost and lowermost areas of the vortex produced by stirring tend to decrease,while the middle vortex experiences a corresponding increase.

关 键 词：搅拌模式 流动 电磁搅拌 数值模拟 

分 类 号：TF777.1[冶金工程—钢铁冶金]