基于FLUENT对水平连铸结晶器凝固过程数值模拟

Numerical Simulation of Level of Mold Solidification Process Based on FLUENT

对圆柱形钢坯的水平连铸问题,采用轴对称二维传热模型,基于FLUENT软件,通过简化边界条件的方法,对初期坯壳生长规律作了计算分析,与射钉结果相比较得到很好验证.通过分析过热度和拉速对出结晶器坯壳厚度,液芯长度的影响,发现40Cr拉速提高0.1m/min,出结晶器坯壳减薄0.91mm,过热度每增加10℃,出结晶器坯壳减薄1.4mm等凝固特点,降低过热度有助于提高拉速.由凝固曲线看出,在刚开始的0~2m内,曲线斜率大,说明冷却强度大,圆坯在凝固后期有个加速凝固阶段.

The solidification mechanism of horizontal continuous casting of steel round rod was studied in this work. Through FLUENT, a two-dimensional axis-symmetrical heat transfer model was adopted for the calculation and analysis of growth of primary shell. The experimental results showed that the model was satisfactory. By analyzing the degree of overheating and speed of green mold shell thickness, length of the liquid core to identify the characteristics of 40Cr steel solidification, it was found that 40Cr improved casting speed 0.1 m/min, the shell thickness leaving mold reduced 0.91 mm, superheated for each additional 10℃, it reduced 1.4 mm, if the lower degree of overheating would give the improvement of casting speed in a large room. The solidification curve showed that in the beginning 2 m, the slope of curve was sharp, that is, the cooling intensity was enhanced, solidification of round billet accelerated in the late stage.