拉速和吹氩量对板坯结晶器内气液两相流动的影响

The influence of casting speed and argon blowing volume on gas-liquid two-phase flow in slab mould

通过水力学模型和数值模拟的方法,分析了拉速和吹氩量对结晶器内气泡分布和流场的影响。结果表明,拉速由1.0 m/min增加到1.4 m/min,结晶器内气泡直径不均匀度由0.73降低到0.64,气泡直径分布更均匀,上表面钢液最大速度由0.09 m/s增加到0.16 m/s;吹氩量由4.0 L/min增加到8.0 L/min,结晶器内气泡直径不均匀度由0.59增加到0.72,气泡直径分布的不均匀性增大,上表面钢液最大速度由0.14 m/s降低到0.09 m/s。在水口浸入深度为150 mm条件下,较好的工艺方案为拉速1.2 m/min,吹氩量4.0 L/min,研究结果可以为优化工艺参数、提高铸坯质量提供理论依据。

The effects of casting speed and argon blowing volume on bubble distribution and flow field in the mould were analyzed by means of water modeling and numerical simulation.The results show that the casting speed increases from 1.0 m/min to 1.4 m/min,the heterogeneity of bubble diameter in the mould is reduced from 0.73 to 0.64,the bubble diameter distribution is more uniform,the maximum speed of the liquid steel on the upper surface increase from 0.09 m/s to 0.16 m/s.The argon blowing volume increases from 4.0 L/min to 8.0 L/min,the heterogeneity of bubble diameter in the crystallizer increases from 0.59 to 0.72,the non-uniformity of bubble diameter distribution is enhanced,the maximum velocity of liquid steel on the upper surface decreases from 0.14 m/s to 0.09 m/s.Under the condition of submergence depth of the SEN is 150 mm,the optimal process plan is casting speed of 1.2 m/min and argon blowing volume of 4.0 L/min,the research result can provide a theoretical basis for optimizing process parameters and improving the quality of casting.