复合磁场作用下板坯结晶器内钢液流动、传热与凝固的数值模拟
Numerical Simulation of Molten Steel Flow,Heat Transfer and Solidification in Slab Mold Under Composite Magnetic Field
韦忍 1苏志坚 1杜以达 1王燕斌2
作者信息
- 1. 东北大学 材料电磁过程研究教育部重点实验室,辽宁 沈阳 110819
- 2. 沈阳东惠科国际贸易有限公司,辽宁 沈阳 113000
- 折叠
摘要
为利用板坯连铸过程中电磁搅拌技术和电磁制动技术各自的优点克服自身缺点,本文应用了结合电磁搅拌和电磁制动的分体式复合磁场并提出电磁制动的结构为单条型电磁制动,对板坯连铸结晶器流场和温度场进行控制.建立了该磁场下结晶器内钢液流动、传热、凝固耦合的三维数值模拟模型.对复合磁场给予结晶器内钢液流动及传热与凝固的影响进行了分析.结果表明:施加复合磁场后,结晶器内上、下返流流速明显减小,钢液主流股对窄面的冲击深度变小,上返流整体下移,弯月面钢液形成顺时针循环流;结晶器内整体温度分布更均匀,弯月面处温度较无磁场时基本不变;结晶器出口处凝固坯壳更为均匀,其厚度较无磁场下有所增加,钢液射流对窄面附近初生坯壳冲刷程度减小.
Abstract
In view of the merits and the insurmountable technical defects of the electromagnetic stirring(EMS)process and electromagnetic braking(EMBr)process,a split type composite magnetic field combining EMS and EMBr is applied in this paper to control the flow field and temperature field in slab continuous casting mold.In this process,a ruler structure of EMBr is proposed.A three-dimensional numerical simulation model of the molten steel flow and heat transfer with coupled solidification in slab mold under magnetic field is established.The effect of the composite magnetic field on the molten steel flow,heat transfer and solidification in mold is analyzed.The results show that,after applying the composite magnetic field,the velocities of the upward flow and the downward flow in the mold decrease obviously,the impact depth of the main stream of molten steel on the narrow surface rises,the upward flow moves down slightly as a whole,and the molten steel on the meniscus forms a clockwise circulation flow.The overall temperature distribution in the mold becomes more homogeneous,and the temperature on the meniscus is almost the same as that without magnetic field.The solidified shell at the outlet of the mold is more uniform,and its thickness is increased compared with that without magnetic field.The washing intensity of molten steel jet on the primary solidification shell near the narrow surface is reduced.
关键词
板坯连铸结晶器/电磁搅拌/电磁制动/传热/数值模拟Key words
slab continuous casting mold/electromagnetic stirring(EMS)/electromagnetic braking(EMBr)/heat transfer/numerical simulation引用本文复制引用
基金项目
国家自然科学基金(2016U1560207)
出版年
2024
NETL
NSTL
万方数据