水口结构对板坯连铸结晶器流场的影响

The Effect of SEN Structure on the Mold Flow Field in the Slab Continuous Caster

结晶器内钢液流场是研究连铸机内传输行为的基础。利用数值模拟方法分析了水口结构(凹底、平底和尖底)、结晶器宽度和拉坯速度下结晶器内钢液流动规律。数值结果表明,在凹底、平底和尖底三种浸入式水口结构下,结晶器内钢液流场相似,但尖底结构水口下钢液液面速度最大,平底次之,凹底最小。随着结晶器宽底的增加,结晶器上部和下部回流区范围增大;随着拉坯速度的增加,结晶器液面速度增加,但是钢液流股对结晶器窄面的冲击位置保持不变。

Fluid flow in the mold is the basis to investigate the transfer behavior in the continuous caster. Numerical simulation is applied to study the effect of different SEN(submerged entry nozzle)structure,mold width and casting speed on the fluid flow in the mold. Numerical results show that the different SEN structures give the similar flow field in the mold. But the fluid velocity at the free surface is the greatest in the case of shape base SEN,greater in the case of flat base SEN and the least in the case of the concave base SEN. The areas of the upper and lower recirculation zone in the mold increase with the increase of the mold width. With the increase of the casting speed,the fluid velocity at the free surface increases but the impact position of steel stream at the narrow face keeps unchanged in the mold.