北京科技大学学报
北京科技大學學報
북경과기대학학보
JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING
2014年
4期
432-437
,共6页
连铸%中间包%分形维数%氧化铝%夹杂物%数值分析
連鑄%中間包%分形維數%氧化鋁%夾雜物%數值分析
련주%중간포%분형유수%양화려%협잡물%수치분석
continuous casting%tundishes%fractal dimension%alumina%inclusions%numerical analysis
在Euler-Lagrange框架下，基于应用分形理论对凝聚态Al2 O3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Al2 O3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Al2 O3夹杂物上浮去除率都逐渐增加.在相同尺寸下，簇群状Al2 O3夹杂物上浮去除率比致密球形Al2 O3夹杂物低；随着尺寸的增加，簇群状Al2 O3夹杂物上浮去除率相比于同尺寸致密球形Al2 O3夹杂物降低得就越多.计算结果显示，与同尺寸的致密球形Al2 O3夹杂物相比，直径为20、40、60和80μm的簇群状Al2 O3夹杂物上浮去除率分别降低了4.8%、5.7%、6.4%和12.5%.
在Euler-Lagrange框架下，基于應用分形理論對凝聚態Al2 O3夾雜物形貌結構進行定量分析的基礎上，數值模擬研究瞭連鑄中間包鋼液中不同形貌凝聚態Al2 O3夾雜物的運動行為.研究髮現中間包鋼液流場和夾雜物形貌呎吋共同影響夾雜物在鋼液中的運動行為.隨著呎吋的變大，簇群狀和緻密毬形兩種形貌Al2 O3夾雜物上浮去除率都逐漸增加.在相同呎吋下，簇群狀Al2 O3夾雜物上浮去除率比緻密毬形Al2 O3夾雜物低；隨著呎吋的增加，簇群狀Al2 O3夾雜物上浮去除率相比于同呎吋緻密毬形Al2 O3夾雜物降低得就越多.計算結果顯示，與同呎吋的緻密毬形Al2 O3夾雜物相比，直徑為20、40、60和80μm的簇群狀Al2 O3夾雜物上浮去除率分彆降低瞭4.8%、5.7%、6.4%和12.5%.
재Euler-Lagrange광가하，기우응용분형이론대응취태Al2 O3협잡물형모결구진행정량분석적기출상，수치모의연구료련주중간포강액중불동형모응취태Al2 O3협잡물적운동행위.연구발현중간포강액류장화협잡물형모척촌공동영향협잡물재강액중적운동행위.수착척촌적변대，족군상화치밀구형량충형모Al2 O3협잡물상부거제솔도축점증가.재상동척촌하，족군상Al2 O3협잡물상부거제솔비치밀구형Al2 O3협잡물저；수착척촌적증가，족군상Al2 O3협잡물상부거제솔상비우동척촌치밀구형Al2 O3협잡물강저득취월다.계산결과현시，여동척촌적치밀구형Al2 O3협잡물상비，직경위20、40、60화80μm적족군상Al2 O3협잡물상부거제솔분별강저료4.8%、5.7%、6.4%화12.5%.
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.
