利用数值模拟方法研究了板坯结晶器电磁制动和吹氩耦合作用下吹氩量、拉速和线圈电流强度等不同工艺 参数对钢/渣界面行为的影响规律, 分析了结晶器内液面波动指数F与液面波动间的关系. 研究表明, 在一定拉速 和电磁制动条件下, 吹氩量增加会加剧钢/渣界面的局部波动, F值随吹氩量增加而增大, 弯月面处的液渣厚度与F 值呈线性递增关系; 在一定吹氩量和电磁制动条件下, 拉速增加并没有恶化水口附近的钢/渣界面波动, 而使F值 增大, 弯月面处的液渣厚度与$F$值呈线性递减关系; 在一定拉速和吹氩量条件下, 增加线圈电流强度会加剧水口附 近的钢/渣界面波动.
It described a numerical simulation study for the interfacial behaviour between molten steel and liquid slag layer with different flow-control technologies in the slab continuous casting mold, considering the effects of argon gas flow rate, casting speed and current intensity of coils on the interfacial behaviour of molten steel and liquid slag with the coupling action of electromagnetic brake (EMBr) and argon gas injection. The relationship between the level fluctuation index of F value and level fluctuation of free surface was also investigated. For a given casting speed with EMBr, increasing the argon gas flow rate can aggravate the local fluctuation of interface so much as lead to the breakup of the steel-slag interface, F value increases with the increasing argon gas flow rate and the thickness of liquid slag near the meniscus increases linearly with F value. For a given argon gas flow rate with EMBr, increasing the casting speed has helpful for restraining the interfacial fluctuation near the nozzle, and F value also increasing, the thickness of liquid slag near the meniscus reduces linearly with F value. On the contrary, for a certain casting speed and argon gas flow rate, increasing the current intensity of coils can aggravate the steel/slag interfacial fluctuation near the nozzle.
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