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利用离散相模型研究水口扩张角(0~12°)对230mm×1 300 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%。
Discrete phase model was used to study the influence of nozzle divergence angle (0 ~ 12 °) on the flow field and argon bubble behavior of 230 mm × 1 300 mm slab mold. And verified by water model experiment. The results show that the larger the expansion angle, the smaller the injection depth and the argon bubble floating in the free surface. Especially when the expansion angle is 9 °, the flow field in the mold is better and the free surface fluctuation is smaller. Conducive to the removal of inclusions and reduce the chances of entrapment. Shuangliu 230mm slab continuous casting industrial tests showed that the installation of expansion angle of 9 ° of the first-class nozzle billet than the other non-expansion nozzle installed on the surface of the other casting slag decreased the incidence of 5.9% to 14.8%.