Abstract: Influence of nozzle side-hole divergence angle (0-12°) on argon bubble behavior and flow field of liquid in mould for 230 mm x 1 300 mm slab has been studied by using discrete phase model, and verified by water model test. Results show that increasing nozzle divergence angle can significantly reduce the impact depth and floating area of argon bubbles at free surface of liquid ； especially with divergence angle 9°, the flow field in mould is better and the free surface of liquid is smaller, it is available to remove the inclusions in liquid and reduce the probability of slag entrapment. The double strands 230 mm slab commercial casting results show that as compared with second strand slab without divergence angle nozzle the occurrence of slag entrapment ratio of first strand slab with installed divergence angle 9° nozzle decreases by 5.9%-14.8%.

Key words: Slab Casting, Nozzle Side-Hole Divergence Angle, Numerical Simulation, Water Model, Argon Blowing in Mould

摘要： 利用离散相模型研究水口扩张角（0~12°）对230mm×1300 mm板坯结晶器流场及氩气泡行为影响。并用水模型实验进行了验证。结果表明,扩张角增大,能显著减小注流冲击深度及氩气泡在自由液面上浮区域;尤其当扩张角为9°时,结晶器流场较好,自由液面波动较小,有利于夹杂物去除及减轻界面卷渣几率。双流230mm板坯连铸工业性试验表明,安装扩张角9°的水口一流铸坯较安装无扩张角水口的另一流铸坯表面夹渣发生率降低了5.9%~14.8%。

关键词: 板坯连铸, 水口扩张角, 数值模拟, 水模型, 吹氩