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利用数值模拟的方法对结晶器中的钢液流动、传热凝固以及夹杂物运动进行了耦合计算。研究表明,钢液对结晶器窄面的冲击严重,导致在冲击点附近的凝固坯壳较薄。夹杂物越大、拉速越小,越有利于夹杂物上浮至自由液面。小颗粒夹杂在结晶器中并不能被有效去除。对于粒径为50μm的夹杂物,当拉速为1 m/min时其上浮率仅为46%,有37%的夹杂物被凝固坯壳捕捉。夹杂物被坯壳捕捉的位置多集中在窄面和宽面靠近窄面处,而在水口下方被捕捉的夹杂物数量则较少。
The numerical simulation method was used to calculate the flow of molten steel, heat transfer and solidification, and inclusion motion in the mold. The research shows that the liquid steel has a severe impact on the narrow face of the mold, resulting in a thin solidification shell near the impact point. The larger inclusions, the smaller the pull rate, the more conducive to inclusions floating to the free surface. Inclusion of small particles in the mold can not be effectively removed. For the inclusions with the diameter of 50μm, the floating rate is only 46% when the drawing speed is 1 m / min, and 37% of the inclusions are captured by the solidification shell. The inclusions are trapped by the shell more concentrated in the narrow face and wide near the narrow surface, and trapped below the nozzle is less the number of inclusions.