【摘要】 以南钢3250超宽板坯结晶器为研究对象,基于商业软件FLUENT,建立了超宽板坯结晶器三维有限体积模型,对结晶器内钢液流动状况和传热行为进行了耦合数值模拟,研究了超宽板坯结晶器流场和温度场特征,考察了水口结构参数和结晶器宽度尺寸、水口倾角、水口插入深度、拉速、过热度及冷却强度对超宽板坯结晶器流场和温度场的影响,多组对比模拟计算结果表明,当浸入式水口出口倾角为15o,插入深度为120~150mm,拉速为1.2~1.4m/min时,结晶器自由液面速度和湍动能分布以及注流冲击点深度均较为适宜,流场较为合理;同时结晶器内钢液的温度分布相对均匀,有利于坯壳的均匀形成.数值模拟结果可为优化南钢超宽板坯结晶器浸入式水口结构以及确定合理工艺参数提供理论依据.更多还原

【Abstract】 Based on the commercial computational fluid dynamics software, Fluent, a three-dimensional finite-volume model was established, and the fluid flow and heat transfer in the super-wide slab mold (cross section size 3250 mm×150 mm) of Nanjing Iron and Steel Company simulated. The basic characteristics of flow and temperature field in a super-wide mold were analyzed, and the effects of mold with, the immersion depth of SEN, outlet angle of SEN, casting speed, overheating and cooling condition on the flow and temperature fields were investigated. The results by comparing several simulated calculations for 3250 mm×150 mm slab showed that a more proper fluid flow with proper distributions of velocity and turbulent kinetic energy at the surface and proper penetration depth could be obtained when the outlet angle was 15°, the immersion depth of SEN 120~150 mm and the casting speed 1.2~1.4 m/min. Meanwhile, the temperature distribution in the mold was reasonable and adequate for the shell formation. The results through numerical simulation provided a theoretical basis for optimizing the configuration design of SEN and choosing reasonable processing parameters for the continuous casting mold of super-wide slab.更多还原