摘要
应用数值模拟方法,建立CSP漏斗型结晶器内钢液流动及凝固传热耦合模型。针对结晶器内铸坯角部受到强冷的特点,对结晶器内热流密度采用修正方程进行计算,分析热流密度修正系数对铸坯凝固坯壳表面温度计算精度的影响。通过比较不同拉坯速率下结晶器内钢液凝固的特点,研究凝固坯壳对结晶器内钢液流动行为的影响。结果表明,采用热流密度修正系数后,铸坯凝固坯壳角部温度的计算值与实际情况更相符;提高拉坯速率可使铸坯凝固坯壳厚度减小;拉坯速率较大时凝固坯壳厚度随铸坯距弯月面距离的增大基本呈线性增长,拉坯速率为3m/min时,凝固坯壳在生长过程中厚度的增长有短暂的停滞现象;凝固坯壳对钢液流动的影响较大,主要是由钢液有效流动区域减少及两相区额外动量阻损造成的。
Based on numerical simulation, a coupled mathematical model of fluid flow, heat transfer and solidification in the CSP funnel type mold was established. In light of the strong cooling pattern at the slab corner, the influence of the correction coefficient of heat flux density on calculation accuracy of slab solidification shell surface temperature was analyzed. By comparing the solidification of molten steel in the mold under different casting speeds, it studied the influence of solidification shell on the flow of molten steel in the mold. The results show that the calculated values of solidification shell temperature on the slab corner are closer to the reality with the use of the heat flux correction coeffi- cient. The solidification shell thickness is reduced with the increase in the casting speed, and the thickness of solidification shell grows linearly with the increase in its distance from the meniscus. Fur- thermore, the process of thickness growth has short stagnation phenomenon when the casting speed is 3 m/rain. The solidification process has a huge impact on the flow characteristic of the molten steel in CSP mold, which is mainly due to the decrease of the liquid steel flow area and the additional momen- tum resistance loss in mushy zone.
出处
《武汉科技大学学报》
CAS
2013年第6期401-405,共5页
Journal of Wuhan University of Science and Technology
基金
国家自然科学基金资助项目(51074023)
关键词
连铸
薄板坯
CSP结晶器
钢液流动
钢液凝固
continuous casting
thin slab
CSP mold
molten steel flow
molten steel solidification
