连铸中间包钢液中凝聚态氧化铝夹杂物运动行为的数值模拟  

Numerical simulation of condensed Al_2O_3 inclusion motion behavior in liquid steel in a continuous casting tundish

作　　者：王耀[1,2] 李宏[1,2] 郭洛方[1,2] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《北京科技大学学报》2014年第4期432-437,共6页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(51074020)

摘　　要：在Euler-Lagrange框架下,基于应用分形理论对凝聚态Al2O3夹杂物形貌结构进行定量分析的基础上,数值模拟研究了连铸中间包钢液中不同形貌凝聚态Al2O3夹杂物的运动行为.研究发现中间包钢液流场和夹杂物形貌尺寸共同影响夹杂物在钢液中的运动行为.随着尺寸的变大,簇群状和致密球形两种形貌Al2O3夹杂物上浮去除率都逐渐增加.在相同尺寸下,簇群状Al2O3夹杂物上浮去除率比致密球形Al2O3夹杂物低;随着尺寸的增加,簇群状Al2O3夹杂物上浮去除率相比于同尺寸致密球形Al2O3夹杂物降低得就越多.计算结果显示,与同尺寸的致密球形Al2O3夹杂物相比,直径为20、40、60和80μm的簇群状Al2O3夹杂物上浮去除率分别降低了4.8%、5.7%、6.4%和12.5%.Under the Euler-Lagrange framework, based on the quantitative description of inclusion morphology using the fractal theory, the motion behavior of condensed Al2 O3 inclusions in liquid steel in a continuous casting tundish was studied by numerical sim-ulation. It is found that liquid steel flow field and inclusion morphology influence the motion behavior of Al2 O3 inclusions in liquid steel together. With increasing inclusion size, the floating removal rate of two different morphologies of inclusions, cluster-like Al2 O3 inclu-sions and spherical Al2 O3 inclusions, becomes larger gradually. At the same inclusion size, the floating removal rate of cluster-like Al2 O3 inclusions is lower than that of spherical Al2 O3 inclusions. As the inclusion size increases, the floating removal rate of cluster-like Al2 O3 inclusions decreases more than that of spherical Al2 O3 inclusions with the same size. At the inclusion size of 20, 40, 60 and 80μm, the floating removal rate of cluster-like Al2 O3 inclusions decreases by 4.8%, 5.7%, 6.4% and 12.5% compared with spheri-cal Al2 O3 inclusions, respectively.

关 键 词：连铸 中间包 分形维数 氧化铝 夹杂物 数值分析 

分 类 号：TF777.1[冶金工程—钢铁冶金]