大方坯连铸结晶器电磁搅拌三维电磁场与流场的数值模拟  

3D NUMERICAL SIMULATION OF ELECTROMAGNETIC FIELD AND FLOW FIELD IN BLOOM CONTINUOUS CASTING MOLD WITH ELECTROMAGNETIC STIRRING

作　　者：任兵芝[1] 朱苗勇[1] 王宏丹[1] 陈永[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004

出　　处：《金属学报》2008年第4期507-512,共6页Acta Metallurgica Sinica

基　　金：教育部新世纪优秀人才支持计划资助项目NCET-04-0285~~

摘　　要：建立了描述大方坯连铸结晶器电磁搅拌过程的电磁场和流场三维数学模型,并分别用有限元、有限体积法进行数值求解,对电磁场计算结果进行了实测检验.结果表明,电磁力在水平面上呈周向分布,铸坯边缘上的切向电磁力在搅拌器中心横截面上最大,在结晶器出口处有一峰值.钢液在横截面内旋转流动,而在纵截面内形成4个旋涡.在铸坯内,从水口向下吐出的钢水与向上回流的钢水流股相冲突,使流股侵入深度变浅,同时使流股向四周发散,从而有利于传热.励磁电流强度与频率对电磁力和流场均有影响.A three-dimensional mathematical model to represent electromagnetic field and flow field in bloom continuous casting mold with electromagnetic stirring was established, and solved by the finite element method and finite volume method, respectively. The predicted electromagnetic fields were verified by measured ones. The results show that the electromagnetic force distributes circumferentially at horizontal plane, and the tangential electromagnetic force of strand edge is the biggest at the center horizontal plane of stirrer, in addition, there is a peak value at the exit of mold. Molten steel recirculates at the cross section of the mold, and there are four recirculations forming in longitudinal section of the mold. In the strand, molten steel flowing from submerged entry nozzle collides with the upward recirculation flow, and the immerged depth of the stream reduces, that will be benefit for heat transfer of molten steel in mold. The distributions of electromagnetic field and flow field were affected by the intensity and frequency of exciting current.

关 键 词：大方坯连铸 结晶器电磁搅拌 电磁场 流场 数值模拟 

分 类 号：TF777[冶金工程—钢铁冶金]