长水口和稳流器对中间包冲击区流动影响的对比研究

Comparative study on effect of ladle shroud and turbulent inhibitor on fluid flow in pouring zone of continuous casting tundish

冲击区通常是连铸中间包内部湍流强度最大的区域,最易发生卷渣和二次氧化,是设计和优化中间包流场的重点。采用物理和数值模拟相结合的方法对比研究了不同长水口、稳流器及其组合对冲击区流动特征的影响规律。结果表明,所构建的中间包流动模型对比验证结果较好;与直筒型长水口相比,喇叭型长水口较大的内径具有较好的降低流股速度的效应,出口速度降低近一半,冲击区最大湍动能从0.0198m^(2)/s^(2)降低到0.0054 m^(2)/s^(2)。稳流器则会增强冲击区主流股区域的湍动能,改变流体运动方向,并通过能量耗散降低流体到达液面的流速。稳流器与喇叭型水口的组合方案可以有效结合长水口的降速效应和稳流器的耗散效应,冲击区液面最大流速降至0.036m/s,死区比例也降低明显。

The impact zone is usually the area with the highest turbulence intensity inside the continuous casting tundish,which is most prone to slag entrapment and secondary oxidation.It is the focus of designing and optimizing the flow field in the tundish.Physical and numerical simulation was carried out to compare the effects of different ladle shroud,turbulent suppressor and their combination on the flow characteristics.The results indicate that the physical and numerical results are in good agreement in the tundish.Compared to a straight ladle shroud,the trumpet ladle shroud with a larger internal diameter outperforms in reducing the flow velocity.The outlet velocity is reduced by almost a half,and the maximum turbulence kinetic energy in the pouring zone is decreased from 0.0198m^(2)/s^(2)to 0.0054 m^(2)/s^(2).The turbulent inhibitor intensifies the turbulence kinetic energy in the main flow region of the pouring zone,changes the flow direction,and reduces the flow velocity reaching the liquid surface through energy dissipation.The combination scheme of the trumpet ladle shroud and the turbulent inhibitor can effectively combine the deceleration effect of the long nozzle and the dissipation effect of the stabilizer.The maximum liquid velocity in the impact zone is reduced to 0.036 m/s,and the proportion of dead zones is also significantly reduced.