中文摘要：

本文研究了利用长、短双水口结合电磁制动技术在同一结晶器内连铸复合钢坯的新工艺.为掌握结晶器内钢液流场和合金元素浓度场分布规律,结合实验和数学模拟分析了该工艺过程.实验中采用浸泡黑芝麻显示流场状态.数学模型中采用低Reynolds数湍流模型计算湍流参数,并比较了隔板与静磁场制动对结晶器内流场的影响.实验与数值模拟结果互相检验,两者吻合良好,据此得到了长、短双水口浇铸复合钢坯工艺结晶器流场和合金元素浓度的分布特征.同时还研究了水口出流结构和静磁场强度参数对流场和浓度场的影响.

英文摘要：

In order to mass-produce the clad steel of stainless/carbon steel at low cost,the new clad steel slab continuous casting process,which uses the combination of long and short submerged entry nozzles and electromagnetic brake in the same mold,was developed.The flow field and concentration field of alloying elements in a clad steel continuous casting mold were studied by combination of experiment and mathematical model.The black sesames dipped in water were used to visualize the flow patterns in the mold.The low Reynolds number turbulent model was used to calculate turbulent viscosity,and the fictitious solidified shell was used to simplify the solidification calculation.The effect of clapboard and electromagnetic brake on the flow field was compared.By comparing experiment with systematical numerical analysis,the reliability and reasonableness of the model proposed were verified. Flow structure and concentration characteristics of alloying element in the mold were obtained,and parameteric studies on the nozzle structure and magnetic flux density were also conducted.