通道式感应加热7流中间包流场的物理模拟

 为解决通道式感应加热7流中间包各流一致性差、第2和第6流钢水停留时间短的问题，通过水模拟试验对该中间包流场进行优化。等温试验结果表明，通过改变通道结构以及添加双挡坝可改善流体的流动状况。与原型结构相比，优化后中间包总体平均停留时间延长了277.8 s，死区比例降低了30.16%，各流一致性得到较大改善。非等温试验表明，感应加热引起的包内自然对流不可忽略，流体经加热从通道流出后会形成明显上升流。通道内外温差越大，中间包各流的一致性越好。针对原型方案，通道内外温差为5 ℃时，中间包内流体停留时间即较无温差时明显延长，死区基本消除。

Physical simulation on a 7-strand continuous casting tundish with channel type induction heating

To solve these problems such as poor consistence between different strands of a 7-strand tundish with channel type induction heating， and short residence time in the 2nd and 6th strands，its configuration was optimized through water modeling. The results of isothermal experiments indicate that the flow characteristics can be improved by changing the channel design and adding two dams at each side of the tundish. Compared with the prototype structure，the average residence time is prolonged by 277.8 s， and the dead zone volume fraction is reduced by 30.16%， which is beneficial to the mixtureof steel temperature and composition， promotethe floatation of inclusions and improve the cleanness of billet.The non- isothermal experiments were performed to simulate the flow in the tundish caused by induction heating. The results indicate that natural convection in the tundish can’t be ignored. The fluid rises up obviously when it flows out from the channel， due to th eaction of buoyancy. The bigger the temperature difference is， the more consistent for different strands of the tundish. For the prototype case， the residence time of fluid is prolonged obviously when the temperature difference between inside channel and outside reaches to 5 ℃， compared with no temperature difference， and the dead zone volume is basically eliminated.