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为了减轻水口侧孔射流对凝固坯壳的冲刷,便于侧孔水口在较小断面的方坯连铸上使用,提出扇形侧孔的水口设计理念。利用结晶器内钢水流动、传热的三维数学模型,分析比较了直筒形水口、矩形侧孔水口和扇形侧孔水口条件下200 mm×200 mm的方坯结晶器内的流场及温度场特征。研究结果表明,侧孔水口能降低射流冲击深度,促进夹杂物上浮,并提高弯月面温度和活跃程度,有利于化渣;扇形侧孔射流较分散,对凝固坯壳的冲刷作用显著减弱。
In order to reduce the scour on the solidified shell by the jet on the side of the nozzle, it is convenient for the side hole nozzle to be used on the billet continuous casting of the smaller section, and the design concept of the nozzle of the fan-shaped side hole is proposed. Using the three-dimensional mathematical model of the flow and heat transfer of molten steel in the mold, the characteristics of the flow field and the temperature field in the billet mold of 200 mm × 200 mm were analyzed and compared with the straight-shaped nozzle, the rectangular-side nozzle and the fan- . The results show that the side-hole nozzle can reduce the impingement jet depth, promote the floating of inclusions and increase the meniscus temperature and the degree of activity, which is beneficial to the slagification. The scalloped side-hole jet is more dispersed and the scouring effect on the solidified shell is significantly weakened.