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针对某钢厂板坯连铸结晶器及浸入式水口(SEN)的结构参数,建立了描述结晶器内钢液流动的三维数学模型,应用FLUENT软件对结晶器内钢液的流场和温度场进行耦合计算,分析SEN底部形状对结晶器内流场和温度场的影响,并利用水模试验对钢液的流动行为进行了验证。结果表明:凸底水口出口附近钢液的速度较大,流股的冲击深度较大,使结晶器内高温区下移,不利于凝固坯壳的生长;平底水口自由面速度较大、温度较高,有利于保护渣的熔化,但易产生液面裸露现象;凹底自由面速度较小、温度较低,有利于液面稳定。
Aiming at the structural parameters of slab continuous casting mold and submerged entry nozzle (SEN) of a steel mill, a three-dimensional mathematical model describing the flow of molten steel in the mold was established. The flow field and temperature field Coupling calculation was carried out to analyze the influence of bottom shape of SEN on flow field and temperature field in mold. The flow behavior of molten steel was verified by water model test. The results show that the velocity of liquid steel near the outlet of the convex bottom outlet is larger and the impact depth of the liquid stream is larger, which causes the high temperature zone in the mold to move downward, which is unfavorable to the growth of the solidified shell. High, is conducive to the melting of the flux, but easy to produce liquid surface nudity phenomenon; concave free surface velocity smaller, lower temperature, is conducive to the liquid level stability.