板坯连铸结晶器温度场的计算机仿真

Computational Simulation on Temperature Field of Slab Continuous Casting Mold

提出一种计算结晶器内温度场的方法 ,方法的核心思想是基于结晶器中的温度分布和凝固壳的厚度分布是一个稳态的过程 ,从而得到流场和温度场稳态下的耦合模型。同时利用有效热容的概念来处理相变潜热源项 ,在程序编制过程中利用动态更新来实现凝固对物理量的影响。模型求解结果与漏钢测试得到的凝固壳厚度进行了对比分析 ,从而证实了方法的正确性和实用性。还研究了板坯结晶器凝固壳厚度分布。

On the core concepts that the distributing of temperature and solidified slab shell in mold are a stable process, a new method to calculate the temperature field in mold has been promoted. Consequently, a coupling model on fluid filed and temperature field in stable state has also been established. The concept of effective heat capacity is introduced to deal with the latent heat source term from phase transformation. During the programming for computation, the dynamic updating method is also applied to simulate the influence of solidification on physical properties. The resolution results of this model are analyzed and compared with the tested thickness of solidified shell from casting broke out slab, which demonstrates the correctness and applicability of this model to the practical continuous casting process. Additionally, the thickness distribution of solidified shell in slab mold are also studied in detail.