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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 effect of electromagnetic stirring on the flow field in arc-shaped mold under the condition of double-hole immersed nozzle was studied. The mathematical model of electromagnetic field and flow field in the process of electromagnetic stirring for round billet continuous casting mold was established. The finite element method and finite volume method were used respectively to solve the numerical problem. The distribution characteristics of the flow field in the mold under different electrical parameters were discussed. The results show that the electromagnetic force distributes asymmetrically in the circumferential direction along the horizontal plane and is distributed in the center, two small heads on the vertical plane. In addition to the upper recirculation zone, Reflux zone and the lower recirculation zone to promote the flow of molten steel is conducive to the formation of equiaxed grains and heat transfer; excitation current intensity is the main factor affecting the electromagnetic stirring effect of the limited impact of frequency, the best mixing parameters I = 200 A, f = 3 Hz.