论文部分内容阅读
在圆坯连铸中,结晶器电磁搅拌器(M-EMS)是常见的改善钢流内流场的手段。众所周知,液芯的流动对最终产品的质量有着重要影响,用M-EMS能优化凝固前沿的流速,进一步促进柱状晶向等轴晶的转变,进而改善铸坯的表面和皮下缺陷。在奥钢联多纳维茨钢厂,绝大多数产品的生产都应用了M-EMS。由于在奥钢联多纳维茨钢厂的恶劣环境下难于进行测量,因此研究采用数值模拟的方法。连铸过程1:1比例的物理模拟也很难实现,因为水的传导率太低,且液态金属不透明或金属处理难,因此数值模拟就成为获得整个过程较好的重要手段。数值模型考虑了流场和电磁场的完全耦合,许多物理问题都用最优参数进行模拟,流场用商业有限元CFD编码软件FLUENT进行计算,电磁场用商业有限元求解器ANSYSEMAG计算。采用这种方法可以研究各种参数对流场和凝固组织的影响,也能揭示搅拌频率和搅拌强度的变化对液芯内部流场的影响。应用数值模拟能够加深对电磁场下连铸过程的认识,也能够找到优化的参数。
In continuous casting, mold electromagnetic stirrer (M-EMS) is a common means to improve the flow field in steel flow. It is well known, the flow wick has a significant impact on the quality of the final product, by M-EMS to optimize the flow rate of the solidification front, to further promote the transformation of the columnar crystal grain shaft, etc., thereby improving the slab surface defects and subcutaneous. In the VAI Donawitz steel mills, the vast majority of products are produced using M-EMS. Due to the difficulty of making measurements in the harsh environment of the VAIO DRAGOZZ steelworks, a numerical simulation method was used. Casting Process 1: 1 ratio of physical simulation is difficult to achieve, because the conductivity of the water is too low, and the liquid metal or metallized opaque hard, thus obtaining numerical simulation has become an important means better overall process. The numerical model considers the complete coupling between the flow field and the electromagnetic field. Many physical problems are simulated with optimal parameters. The flow field is calculated using the commercial finite element CFD code FLUENT. The electromagnetic field is calculated using the commercial finite element solver ANSYSEMAG. This method can be used to study the influence of various parameters on the flow field and the solidified structure. It can also reveal the influence of mixing frequency and stirring intensity on the flow field inside the wick. The application of numerical simulation can deepen the understanding of continuous casting process under electromagnetic field, and can also find the optimal parameters.