板坯连铸结晶器内部流场的数值模拟

Numerical Simulation of Internal Flow Field in Slab Continuous Casting Mold

连铸结晶器作为控制钢水清洁度的最后环节,结晶器液面波动不仅影响连铸生产的稳定性,还会引起卷渣、拉漏、钢水裸露氧化等。本文采用数值模拟方法,利用Fluent软件的k-ε湍流模型对板坯结晶器内钢水流动状态和液面波动规律现象进行模拟研究,分析了拉速和吹氩量对结晶器内流场的影响。结果表明:随着拉速的不断提升,钢液对铸坯窄面冲击深度不断增大,结晶器内自由液面表面流速增加,液面波动加剧;氩气量增加,钢液对铸坯窄面的冲击位置上移,液面波动剧烈程度增加,容易导致结晶器卷渣和钢水裸露氧化。

The continuous casting mold is the last link to control the cleanliness of the molten steel.The liquid level fluctuation of the crystalliz?er not only affects the stability of the continuous casting production,but also causes slagging,leakage,and bare oxidation of the molten steel.In this paper,numerical simulation method was used to simulate the flow state of molten steel and liquid surface fluctuation phenomenon in the slab mold using Fluent software k-εturbulence model.The influence of casting speed and argon blowing amount on the flow field in the mold was analyzed.The results show that with the continuous increase of casting speed,the impact depth of liquid steel on the narrow surface of the casting billet increases,the surface velocity of the free liquid surface in the mold increases,and the fluctuation of the liquid level increases;the amount of argon gas increases,and the liquid steel increases the narrowness of the casting billet.As the impact position moves up,the se?verity of the liquid surface fluctuation increases,and it is easy to cause mold slag and molten steel to be exposed to oxidation.