连铸浸入式水口结构优化的水模型试验

Water model experiment on structural optimization for submerged entry nozzle

以济钢板坯连铸结晶器为原型,采用几何相似比为1∶1,弗鲁德准数与原型相等的水模型进行试验,研究了不同拉速条件下,不同浸入式水口的侧孔倾角和出口尺寸对板坯结晶器内流场和液面波动行为的影响。结果表明:拉速一定的条件下,随着水口侧孔倾角和出口尺寸增大,液面波动减小,上、下涡心位置离结晶器窄面越近且冲击深度增加。综合考虑,选用侧孔倾角为5°、出口尺寸为100mm×65mm×R32.5mm的水口。

According to the prototype of slab continuous casting crystallizer at Jinan Branch of Shangdong Iron and Steel Group Co. , Ltd. , water model with the geometric similarity ratio of 1 ： 1 and the same Fr criterion as prototype was established. Under the condition of different casting speed, the effect of side hole angle and outlet size of the submerged entry nozzle on the inner flow filed and liquid surface fluctuation of crystallizer was studied. Results show that with the certain casting speed, when side hole angle and outlet size increase,the liquid surface fluctuation decreases, the up and down vorticity center are closer to the narrow wall of crystallizer, and impacting depth increases. Considering the above factors, the submerged entry nozzle with the side hole angle of 5° and outlet size of 100 mm×65 mm×R32. 5 mm was selected.