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連鑄中間包鋼液中凝聚態氧化鋁夾雜物運動行為的數值模擬

Numerical simulation of condensed Al2O3 inclusion motion behavior in liquid steel in a continuous casting tundish

  • 摘要: 在Euler-Lagrange框架下,基于應用分形理論對凝聚態Al2O3夾雜物形貌結構進行定量分析的基礎上,數值模擬研究了連鑄中間包鋼液中不同形貌凝聚態Al2O3夾雜物的運動行為.研究發現中間包鋼液流場和夾雜物形貌尺寸共同影響夾雜物在鋼液中的運動行為.隨著尺寸的變大,簇群狀和致密球形兩種形貌Al2O3夾雜物上浮去除率都逐漸增加.在相同尺寸下,簇群狀Al2O3夾雜物上浮去除率比致密球形Al2O3夾雜物低;隨著尺寸的增加,簇群狀Al2O3夾雜物上浮去除率相比于同尺寸致密球形Al2O3夾雜物降低得就越多.計算結果顯示,與同尺寸的致密球形Al2O3夾雜物相比,直徑為20、40、60和80μm的簇群狀Al2O3夾雜物上浮去除率分別降低了4.8%、5.7%、6.4%和12.5%.

     

    Abstract: Under the Euler-Lagrange framework, based on the quantitative description of inclusion morphology using the fractal theory, the motion behavior of condensed Al2O3 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 Al2O3 inclusions in liquid steel together. With increasing inclusion size, the floating removal rate of two different morphologies of inclusions, cluster-like Al2O3 inclu-sions and spherical Al2O3 inclusions, becomes larger gradually. At the same inclusion size, the floating removal rate of cluster-like Al2O3 inclusions is lower than that of spherical Al2O3 inclusions. As the inclusion size increases, the floating removal rate of cluster-like Al2O3 inclusions decreases more than that of spherical Al2O3 inclusions with the same size. At the inclusion size of 20, 40, 60 and 80μm, the floating removal rate of cluster-like Al2O3 inclusions decreases by 4.8%, 5.7%, 6.4% and 12.5% compared with spheri-cal Al2O3 inclusions, respectively.

     

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