四流圆坯中间包结构优化物理模拟

Physical Modeling Research on Structural Optimization of Four-strand Billet Tundish

通过几何相似比1∶3的水模拟实验,对安装不同结构的挡墙的中间包内的流场进行研究,计算钢液在中间包的平均停留时间(RTD)。结果表明:中间包采用"U"型挡墙,平均停留时间较长,夹杂物上浮得到较好发展,两侧水口响应时间及峰值时间差别较大。"V"形挡墙比"U"形挡墙更有利于中间包内夹杂物的去除,很好解决了两侧水口的同步性和延长了停留时间,减少了死区体积分数,增加了活塞区体积分数。

The flow field and RTD curves in a tundish for four-strand round billet tundish with different structural baffles were simulated by the test of physical model with 1：3 geometric similarity scale. The results show that the average residence time of liquid steel in the tundish prolongs and the inclusion removal improves when the U-shape baffles is used in the tundish. But the response time of two side outlet have a great difference. Y-shape ba- ffle is the better than U-shape baffles, which can change the fluid flow in the tundish efficiently and improve inclusion removal, can satisfactorily obtain the flow synchronism between outlets, and effectively reduce the dead area volume fraction, increase the plug volume fraction.