采用1∶1的水模型研究了5种不同底孔直径（16～28mm）的三孔水口下漏斗型薄板坯结晶器内的流场、液面特征和卷渣行为。结果表明：在常规工艺参数下,5种三孔水口下结晶器内钢液的流场都是典型的＂双辊流＂,且流场稳定;在5种三孔水口下结晶器液面波动都较平稳,且波动范围都在±（3～5）mm之间。5种不同水口下结晶器液面主要发生剪切卷渣,漩涡卷渣很少发生。试验得知：在水口浸入深度280mm,拉速为5m/min时,剪切卷渣发生的钢液临界表面速度是0.32m/s,与文献报道的模型计算值较吻合。在水口浸入深度280mm、拉速为5m/min的条件下,适合薄板坯连铸的最佳的三孔水口的底孔直径为22mm。
A full-scale funnel-shaped thin slab water model was built to investigate the fluid flow,meniscus fluctuation and slag entrapping behaviors when it were fed by five three-port submerged entry nozzles（SENs） with various diameters.The results shows that the fluid flow in the present mold is a typical steady ＂double roll flow＂ when using these five SENs.Furthermore,meniscus fluctuation is within ±（3-5） mm under regular casting parameters（SEN immersion depth and casting speed is 280 mm and 5 m/min,respectively）.The mode of slag entrapping is mainly entrapment by shear flow,and the vortex-related entrapment hardly occurs.The critical meniscus velocity which cause slag entrapping is determined to be 0.32 m/s under the regular casting parameters mentioned above,which agrees well with the calculated value.The optimal bottom-hole diameter for this three-port SEN which is suitable for thin slab casting is 22 mm.
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