Abstract: In order to evaluate whether the existing design of submerged nozzle is reasonable or not, the simulation test on liquid level fluctuation and impact depth of flow in 230 mm x (900 ~2 150) mm mold with casting speed 0. 8 ~ 1.7 m/min is earned out by using geometric similarity 1: 2 water model. Results show that for current mold of five different cross sections, the liquid level is relatively stable and the wave height in model is no more than 1. 5 mm (corresponding prototype within 3 mm) , the slag level is stable and the distribution of molten slag layer is relatively uniform； but as for smaller cross-section slab with lower casting speed even if the impact depth is lower the liquid level fluctuation is less than 0. 5 mm (corresponding prototype less than 1.0 mm) led to lack of activity of slag-steel interface, bad melting of slag, and even causing shell of liquid surface, therefore it is necessary to re\ amp and optimize the current submerged nozzle.

摘要： 为评价现有浸入式水口设计是否合理,通过几何相似比1:2的水模型对拉速0.8～1.7 m/min,断面为230 mm×(900～2 150)mm的板坯结晶器液面波动和冲击深度进行了模拟实验。结果表明,现行结晶器在5种不同断面下液面较平稳,模型中波高都在1.5 mm以内(相当于原型3 mm以内),保护渣渣层平稳,液渣层分布较均匀;而当低拉速、小断面时,即使冲击深度较低,液面波动也小于0.5 mm(相当于原型小于1 mm),导致渣-钢界面活跃不够,化渣不良,甚至可能造成液面结壳,故有必要对现有浸入式水口进行优化改造。

关键词: 板坯, 结晶器, 浸入式水口, 水模型, 液面波动