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对断面为850 mm×200 mm、1 150 mm×200 mm、1 400 mm×200 mm的板坯进行1∶1的物理模拟。通过改变浸入式水口的结构,从而对结晶器内流场、保护渣的分布,以及结晶器表面波动情况进行分析研究。实验结果表明,在断面为850 mm×200 mm时,两孔和三孔水口液面波幅的方差分别为0.27和0.03,大约相差10倍,同时由流场图看出三孔水口有效的减少了偏流现象;在断面为1 150 mm×200 mm时,在形成上回流区的3 s内,两孔水口上回流区的面积已经覆盖了2/3,保护渣覆盖面积为钢液表面的4/5且有波动情况,而三孔水口上回流区的覆盖面积只有1/5,保护渣完全覆盖且表面保护渣的波动不明显,因此得出两孔水口更优于三孔水口,使保护渣更容易融化。
The physical simulation of the slab with the cross sections of 850 mm × 200 mm, 1 150 mm × 200 mm and 1 400 mm × 200 mm was carried out by 1: 1 physical simulation. By changing the structure of the submerged entry nozzle, the flow field in the mold, the distribution of the mold flux and the fluctuation of the mold surface are analyzed. The experimental results show that when the cross section is 850 mm × 200 mm, the variance of liquid surface amplitude between two holes and three holes is 0.27 and 0.03, respectively, about 10 times. At the same time, the three holes are reduced effectively Partial flow phenomenon. When the cross section is 1 150 mm × 200 mm, the area of the recirculation zone of the two holes has covered 2/3 within 3 s of forming the upper recirculation zone, and the coverage area of the mold fluxes is 4 / 5 and there is fluctuation, and the three holes on the back of the flow area of the coverage area is only 1/5, completely covered with mold flux and the surface of the slag is not obvious fluctuations, so draw two hole nozzle is better than three holes, the mold flux Easier to melt.