板坯连铸结晶器内渣/金界面非稳态波动行为

采用VOF法对板坯连铸结晶器内渣/金界面的非稳态波动行为进行研究，使用几何重建方案模拟连铸结晶器内渣/金界面的运动形态.分析了拉速、水口插入深度和倾角对连铸结晶器内渣/金界面波动的影响.结果表明，在浇注初期，渣/金界面的波动幅度较小；随着时间的发展，渣/金界面的波动幅度不断增大；达到动态稳定后水口附近的渣/金界面会出现不规则的锯齿状波动.漩涡的不稳定性是造成渣/金界面锯齿状波动的原因.随着拉速的增大，渣/金界面波动加剧；随着水口插入深度和倾角增大，渣/金界面波动减弱.

Unsteady Fluctuation Behavior of Slag-Metal Interface in a Slab Continuous Casting Mold

The unsteady fluctuation behavior of the slag-metal interface in a slab continuous casting mold was studied using the volume of fluid(VOF)method. The morphology of the meniscus was simulated using the geometric reconstruction scheme. The effects of casting speed， immersion depth and port angle of submerged entry nozzle(SEN) on the interface fluctuation in the mold were studied. The results show that the interface fluctuation is ever changing with time. The fluctuation is small and increases with time at the beginning of the casting. After attaining dynamic steady state， serrated fluctuation phenomenon appears around the SEN. The reason for the serrated fluctuation is the existence of vortices. The fluctuation increases with increasing the casting speed， and decreases with increasing the immersion depth and port angle of the SEN.