流动控制结晶器内磁场和吹氩对夹杂物粒子群运动的影响  

EFFECTS OF MAGNETIC FIELD AND ARGON GAS INJECTION ON THE INCLUSION MOTION IN FLOW CONTROL MOLD

作　　者：李宝宽[1] 霍慧芳[1] 栾叶君[1] 

机构地区：[1]东北大学材料与冶金学院热能工程系,沈阳110004

出　　处：《金属学报》2003年第9期932-937,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目50274029

摘　　要：利用数学模型求解包含电磁力项的Navier-Stokes方程得到流场的速度分布,以流场为基础,建立夹杂物粒子群运动的计算模型.利用水模型实验检验单一球体运动轨迹的计算结果.没有磁场作用时,所有粒子分两组分别进入上下回旋区作螺旋线运动,部分粒子在回流区内作螺旋线运动后又进入水口射流区,然后再进入反向回流区.处于上部回流区的夹杂物具有去除的可能性.吹入氩气能增加夹杂物粒子进入上部回流区的机会,从而提高夹杂物粒子的去除率.施加磁场后,夹杂物粒子的螺旋运动消失,同时粒子的运动速度明显降低.吹入氩气和施加磁场两者均能有效地控制夹杂物粒子群的运动.The fluid velocity field was obtained by using a numerical model to solve the Navier Stokes equations with electromagnetic force, and the trajectories of inclusion particles are calculated based on the computed velocity field. A reasonable agreement between numerical and experimental trajectory for single sphere was obtained in water model. The movements of particles are traced in cases with and without the magnetic field and argon gas injection. Without magnetic field, some particles after spiral movements re-enter the jet zone of molten steel, and then enter opposite circulation zone. Inclusions in the upper circulation zone are removed easily; Argon gas injection increases the removal rate of inclusions. The spiral trajectories of inclusion particles disappear when the magnetic field is applied, and the particle velocities decrease significantly. The argon gas injection and magnetic field application are effective for coatrolling inclusions.

关 键 词：结晶器 夹杂物 吹氩 磁场 

分 类 号：TF769[冶金工程—钢铁冶金] TG249.7[金属学及工艺—铸造]