连铸结晶器内氢气/钢液两相非稳态湍流特性的大涡模拟研究  

LARGE EDDY SIMULATION OF UNSTEADY ARGON/STEEL TWO PHASE TURBULENT FLOW IN A CONTINUOUS CASTING MOLD

作　　者：刘中秋[1] 李宝宽[1] 姜茂发[1] 张立[2] 徐国栋[2] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819 [2]宝山钢铁股份有限公司,上海201900

出　　处：《金属学报》2013年第5期513-522,共10页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目50934008~~

摘　　要：提出了一种连铸结晶器内氩气/钢液两相非稳态湍流流动的大涡模拟模型,采用非齐次Euler-Euler双流体模型描述氩气/钢液两相流运动方程,采用大涡模拟模型对湍流黏性力进行求解.利用板坯探伤缺陷检测结果间接地验证了氩气/钢液两相非稳态湍流运动特征,利用水模型实验结果验证了两相的非对称流动特征.结果表明,氩气泡的行为将直接影响结晶器内钢液的流动行为.气泡在结晶器内的运动行为主要受吹Ar量和钢流量的影响,其平均直径随着吹Ar量的增大而增大,随着钢流量的增大而减小.结晶器内的不对称流场具有不稳定性,偏流是绝对的,对称是暂时的、偶然的,偏流的周期性不明显.结晶器二冷区弯曲段的弧形形状对结晶器内部流场的影响较大,偏流发生在弯曲段附近.A large eddy simulation of unsteady argon/steel two phase flow in a continuous casting mold is presented in this work. The inhomogeneous Euler-Euler approach is used to describe the equations of motion of the two phase flow. Large eddy simulation model is used to solve the turbulent viscosity force. The drag force, lift force and virtual mass force are incorporated in the model. And this model has been validated with a water model experiment and the measurements of the ultrasonic flaw detection. The predicted unsteady two phase turbulent flow characteristics were validated, indirectly, by the measurements of ultrasonic flaw detection. The predicted asymmetric flow was validated by the water model experiment. The simulation results show that the distribution of the bubble diameter is seen to depend on the argon gas and molten steel flow rates. The mean bubble diameter decreases with increasing the molten steel flow rate, but increases with increasing the argon gas flow rate. The asymmetric flow inside the mold was not stationary; the time intervals for changeover appeared to be vary random. It can be concluded that the shape of the bending part of the secondary cooling zone of mold is important to the asymmetric flow. The asymmetric flow occurs near the bending section.

关 键 词：连铸结晶器 两相流 大涡模拟 Euler-Euler模型 

分 类 号：TF777[冶金工程—钢铁冶金]