基于同时满足连铸水模拟实验中Re准数和Fr准数相似要求, 建立了一套可全尺度模拟连铸过程流动的实验平台. 利用该平台的NI图像处理与PIV粒子测速技术, 对特厚板连铸用中间包内速度场、涡量场、RTD等流动特征进行研究. 结果表明, 中间包内流动呈现湍流漩涡状, 在注流区形成一个类似“漏斗”状的涡结构, 由于中间包内通道的存在, 在浇注区形成2个大的环流, 并对侧墙有明显冲击, 非接触测量获取的RTD与数值模拟结果吻合, 长的停留时间和大的死区体积表明该中间包补热的必要性.
The importance of proper melt flow in continuous casting tundish for production of clean steel was well recognized, more in-depth research melt flow by physical models can promote tundish metallurgy effect and improve the quality of liquid steel. Based on the requirements of Re number and Fr number similar on the same time in the continuous casting water simulation, a synthetical hydraulic simulation platform of continuous casting was established. Flow characteristics with velocity field, vorticity field, RTD in extra thick slab tundish were got by the platform using NI image processing and PIV. The results showed that flow in the tundish had larger turbulent eddies, which formed a similar "funnel" vortex structure in inlet section of the tundish. Flow brought two big circulations in the exit section because of the channel and had a great impact on the side walls. RTD with noncontact measurement was coincident with the results of numerical simulation, longer residence time and larger dead volume showed the necessity of heating for the tundish.
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