单带式连铸结晶器内熔体在静磁场下的流动行为模拟  

Numerical Simulation of Fluid Flow during Strip Casting with Electromagnetic Braking in the Mold of Single-belt Caster

作　　者：龚海军[1] 张成光[2] 李新中[1] 徐达鸣[1] 郭景杰[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [2]河南工业职业技术学院,南阳473009

出　　处：《机械工程学报》2014年第2期55-61,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51071062;51271068;51274077);国家重点基础研究发展计划(973计划;2011CB605504)资助项目

摘　　要：为研究单带式水平铸造结晶器内熔体在静磁场制动下的流动行为,基于有限体积法建立一个描述水平薄带连铸结晶器内电磁场-凝固传输过程耦合的三维数学模型。通过把磁场和凝固传输过程原本相互影响的双向耦合过程简化为静磁场对凝固传输过程的单向作用,采用间接耦合法计算电磁-凝固传输过程,分别以ANSYS计算的两种外形的真实磁场和文献中所用虚拟条形磁场作为静磁载荷,计算各种棱廓的磁场和不同磁感应强度值对结晶器内流动行为的影响。结果表明,以0.2 T恒值横向贯穿结晶器的虚拟磁场对熔体流动控制的综合效果较好,竖直条形比水平条形磁场更优;由于磁场存在衰减,导致真实磁场在整个结晶器截面的流动形态不一致,其值为0.4 T时对流动的修正效果最好,但较虚拟磁场差。该计算模型及研究方法和结果为改进磁流修正装置和结晶器内流动的后续研究提供依据和参考。For theoretically investigating the fluid flow under the influence of various direct-current（DC） magnetic fields in the mold of a Single-belt horizontal continuous caster, a three-dimensional（3D） numerical model for describing electromagnetic-solidification phenomena based on finite volume method（FVM） is presented. The bidirectional interactions between transport process and DC magnetic fields are simplified as a unilateral one, and the fully coupled transport equations are numerically solved by indirect-coupling method. The DC magnetic fields with two configurations output by ANSYS as well as two assumed magnetic fields in literatures with different values are taken as external DC magnetic fields for EMBr; the influences of various magnetic fields on flow field are studied by numerical calculation. The results show that 0.2 T magnetic field with fictitious configurations can result in a reasonably flow, and a vertical-type DC magnetic field precedes the horizontal one. The optimal flow field could be achieved when a 0.4 T real DC magnetic field with different configurations applied, which is inferior to the fictitious DC magnetic field due to decay characteristic of a real magnetic field. The calculation model and the methods as well as all results provide the basis and reference for the improvement of the magnetic flow modifier and flow in mold in follow-up study.

关 键 词：水平连铸 电磁制动 单带式铸机 ANSYS 数值模拟 

分 类 号：TF777[冶金工程—钢铁冶金] TG249[金属学及工艺—铸造]