电磁搅拌作用下弧形结晶器流场的数值模拟
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摘要
研究了双侧孔浸入式水口条件下,弧形结晶器内流场受电磁搅拌作用的影响。建立了圆坯连铸结晶器电磁搅拌过程的电磁场和流场数学模型,分别采用有限元和有限体积法进行数值求解,讨论不同电参数下结晶器内流场分布特点。结果表明:电磁力在水平面沿圆周方向呈非对称分布,竖直面上呈"中间大,两头小"分布;电磁搅拌作用使得结晶器内流场除出现上回流区外,还产生主回流区和下回流区,促进钢水流动,有利于等轴晶的形成和热传递;励磁电流强度是影响电磁搅拌作用的主要因素,频率的影响效果有限,最佳搅拌参数是I=200 A,f=3 Hz。
The influence of the electromagnetic stirring on the distribution of the flow field in the curved mold with twosideimmersed nozzle is analyzed. A three- dimensional mathematical model to represent electromagnetic field and flow field in the round bloom mold with electromagnetic stirring is established,and solved by the finite element method and finite volume method,respectively. The effects of the different current and frequency value of coils on the behavior of flow field are discussed. The results show that the electromagnetic force distributes circumferentially as well as asymmetrically at horizontal plane,and the electromagnetic force is bigger at the center at vertical plane of stirrer. Owing to the effect of electromagnetic stirring,the recirculation zones formed at the center as well as the bottom in the curved mold,which promotes the flow of the molten steel and contributes to the formation of the equiaxed crystal and heat transfer.The exciting current intensity plays an important role in the effect of the electromagnetic stirring,and the frequency has some limited effectiveness. The most suitable stirring parameters are I=200 A,f=3 Hz.
The influence of the electromagnetic stirring on the distribution of the flow field in the curved mold with twosideimmersed nozzle is analyzed. A three- dimensional mathematical model to represent electromagnetic field and flow field in the round bloom mold with electromagnetic stirring is established,and solved by the finite element method and finite volume method,respectively. The effects of the different current and frequency value of coils on the behavior of flow field are discussed. The results show that the electromagnetic force distributes circumferentially as well as asymmetrically at horizontal plane,and the electromagnetic force is bigger at the center at vertical plane of stirrer. Owing to the effect of electromagnetic stirring,the recirculation zones formed at the center as well as the bottom in the curved mold,which promotes the flow of the molten steel and contributes to the formation of the equiaxed crystal and heat transfer.The exciting current intensity plays an important role in the effect of the electromagnetic stirring,and the frequency has some limited effectiveness. The most suitable stirring parameters are I=200 A,f=3 Hz.
引文
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[15]李建超,崔建忠,王宝峰,等.小方坯连铸结晶器电磁搅拌的数值模拟[J].炼钢,2007,23(1):35.
[2]毛斌,肖红,易兵.中国连铸电磁搅拌技术已进入世界前列[J].连铸,2015,(1):1.
[3]蔡开科,程士富.连续铸钢原理与工艺[M].北京:冶金工业出版社,1994.
[4]陈永.连铸结晶器电磁搅拌技术[J].钢铁钒钛,2003,24(2):29.
[5]刘和平.连铸过程中电磁流体力学的数值模拟现状及发展趋势[J].连铸,2015,(1):7.
[6]张宏丽,王恩刚,贾光霖,等.搅拌器结构参数对钢液内电磁场和流场分布的影响[J].钢铁研究学报,2002,14(4):10.
[7]张静,王恩刚,邓安元,等.大方坯连铸M-EMS参数对磁场和流场分布的影响[J].钢铁,2012,47(6):27.
[8]任兵芝,朱苗勇,王宏丹,等.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[J].金属学报,2008,44(4):507.
[9]陈永,张长利,沈厚发,等.连铸结晶器电磁搅拌磁场及钢液流场模拟[J].钢铁研究学报,2008,20(7):11.
[10]于海岐,朱苗勇.圆坯结晶器电磁搅拌过程三维流场与温度场数值模拟[J].金属学报,2008,44(12):1465.
[11]赵倩,张兴国,张环月,等.螺旋磁场电磁搅拌的数值模拟[J].中国有色金属学报,2014,24(4):1041.
[12]熊洪进,阴树标,马忠存,等.圆坯连铸机电磁搅拌磁场特性研究[J].连铸,2015,(1):36.
[13]Yang Z G,Wang B,Zhang X F,et al.Effect of electromagnetic stirring on molten steel flow and solidification in bloom mold[J].Journal of Iron and Steel Research,International,2014,21(12):1095.
[14]陶文铨.数值传热学[M].第2版.西安:西安交通大学出版社,2001.
[15]李建超,崔建忠,王宝峰,等.小方坯连铸结晶器电磁搅拌的数值模拟[J].炼钢,2007,23(1):35.