带过滤器63t中间包钢液流场的物理和数学模拟

通过采用几何相似比0.29:1的水模型和数学模型分别对(a)湍流抑制器和挡墙+坝(原结构),(b)湍流抑制器,挡墙+坝和过滤器,以及(c)湍流抑制器,挡墙和过滤器3种结构两流板坯连铸中间包钢液流场、温度场和夹杂物运动轨迹进行模拟研究。结果表明,原中间包结构(a)活塞区体积偏小,死区体积偏大;加入通道式钢液过滤器(b)后短路流基本消失,中间包死区减小6.83%,钢液的平均停留时间由287.04 s延长至373.76 s,有利于夹杂物的上浮去除,且过滤器的加入对钢液的温降影响不大;用钢液过滤器代替挡坝(c)后优化效果最为明显,中间包钢液平均停留时间由287.04 s延长至404.26 s,峰值时间由原来的95,4 s延长至190.8 s,死区体积由36.10%减小至8.76%。

Physical and Mathematical Simulation on Flow Field of Liquid in 63t Tundish with a Filter

The simulation research on liquid flow field, temperature field and inclusions moving trace in tundish for two strands slab casting with 3 kinds of structure-(a) turbulence inhibitor and wall + dam (original structure) , (b) turbulence inhibitor, wall + dam and channel filter and (c) turbulence inhibitor, wall and channel filter has been carried out by using geometric similarity 0. 29 ： 1 water model and mathematical model. Results show that in tundish with original structure (a) the plug flow area is relatively small and the dead area is rather large； by adding channel liquid filter (b) the short circuit flow basically disappears, the dead volume in tundish decreases by 6. 83% and the average resident time of liquid increases from 287. 04 s to 373. 76 s, it is available to remove the inclusions from liquid and the effect of filter on drop in temperature of liquid is not obvious ； by using the filter to replace the dam (c) the effect of optimization is particularly obvious, that is the average residence time of liquid in tundish increases from 287. 04 s to 404.26 s, the peak time increases from original 95. 4 s to 190.8 s and the dead volume decreases from 36.10% to 8.76% .