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建立并求解动量、热量和质量传输耦合模型,研究了连铸结晶器内钢液流动、传热、凝固、溶质输运和夹杂碰撞长大行为。数值结果表明连铸机内钢液温度、碳质量分数和夹杂物体积分数的空间分布与钢水流动特征相似,也可分为上下2个循环区。但是其分布具有各自的特点。在涡心处,钢液温度较低,碳质量分数较高,夹杂物体积分数和数量密度较低。在弯月面处,钢液温度较低,碳质量分数较高,夹杂物的体积分数和数量密度较低。在结晶器出口处的凝固坯壳内,夹杂物的体积分数和数量密度分布极不均匀,存在阶跃现象,这与冲击点处凝固坯壳的重熔有关。
The coupling model of momentum, heat and mass transfer was established and solved. The flow of liquid steel, heat transfer, solidification, solute transport and inclusions collision in continuous casting mold were studied. The numerical results show that the spatial distribution of molten steel temperature, carbon mass fraction and inclusion volume fraction in the continuous casting machine is similar to that of the molten steel, and can be divided into two upper and lower circulation zones. But its distribution has its own characteristics. At the vortex center, the temperature of the molten steel is lower, the carbon mass fraction is higher, the inclusion volume fraction and the number density are lower. At the meniscus, the temperature of molten steel is lower, the carbon mass fraction is higher, and the volume fraction and number density of inclusions are lower. In the solidification shell at the outlet of the mold, the volume fraction and the number density of the inclusions are very unevenly distributed, and there is a step phenomenon, which is related to the remelting of the solidified shell at the impact point.