水平连铸结晶器内真实换热边界计算及传递模型

Calculation and Transfer Model of Real Heat Transfer Boundary in Horizontal Continuous Casting Mold

连铸结晶器内冷却水的流动、传热和金属液的传热、凝固全耦合计算时,模型计算效率低、收敛性差,而不考虑真实冷却水流场只进行金属液传热-凝固耦合时,模型计算精度较低,可将冷却水流动-传热和金属液传热-凝固过程分别建模,并基于二次开发的温度场量原位传递程序,将模型串联耦合。结果表明,通过耦合流场计算得到的真实冷却边界替代传统均匀界面换热系数的边界条件施加方式,在保证模型计算效率和计算精度的前提下,可准确模拟铸坯晶粒的尺寸、取向和数量,经试验验证,模拟结果与试验结果高度吻合。

A new model has been proposed to address the issues of low calculation efficiency and poor convergence in the fully coupled calculation of cooling water flow and heat transfer,and liquid metal heat transfer and solidification in continuous casting crystallizer.The current models exhibit low calculation accuracy when the real cooling intensity is only coupled with liquid metal heat transfer and solidification.The new model aims to model the flow-heat transfer of cooling water and the heat transfer and solidification process of liquid metal separately.The model was coupled in series based on the in-situ temperature field data transfer program via secondary development.The results show that the real cooling boundary condition calculated by the coupled flow field can replace the traditional boundary condition application method of uniform interface heat transfer coefficient.The new model can accurately simulate the size,orientation,and quantity of the grain of the billet while ensuring the calculation efficiency and accuracy of the model.The simulation results are in good agreement with the experimental results.