论文部分内容阅读
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 model of unsteady turbulent flow in argon / molten steel in continuous casting mold was proposed. The kinematic equations of argon / molten steel flow were described by non-homogeneous Euler-Euler two-fluid model. Large eddy simulation model is used to solve the turbulent viscosity force.The unsteady turbulent flow characteristics of argon / molten steel are indirectly verified by the test results of slab flaw detection. The water model experimental results verify the asymmetric flow of two phases The results show that the behavior of argon bubble will directly affect the flow behavior of the molten steel in the mold.The movement behavior of the bubble in the mold is mainly affected by the amount of Ar and the amount of steel flow and the average diameter increases with the amount of Ar Large and increases, decreases with the increase of steel flow.The asymmetric flow field in the mold has instability, the bias current is absolute, the symmetry is temporary, and the periodicity of the bias current is not obvious. The curved shape of the curved section of the secondary cooling zone has a great influence on the flow field inside the mold, and the bias current occurs near the curved section.