五流中间包流场数值模拟与结构优化

Numerical Simulation and Structure Optimization of Five-Strand Tundish Flow Field

为优化中间包内钢液流动特性、提高钢坯质量,本文利用CFD开源软件OpenFOAMv8,对5流中间包钢液流场进行了数值模拟。利用水模型实验对数学模型进行验证,结果表明死区比例误差不到2%。对原型中间包流场进行分析,发现2#、3#出流口存在钢液短路现象,死区比例为12.77%,有必要对中间包结构进行优化。根据流场分析,拟通过增加挡坝、调整2个导流孔孔径与仰角等措施改善流场特性。通过对比9种导流孔方案下钢液流动特性参数的数值模拟结果,得到其优化方案为:在3#、4#出流口中间增设挡坝,导流孔B、C内径扩大至200 mm,导流孔B仰角增大至30˚。结果表明:结构优化后的中间包内流场的死区比例可降低至2%左右。

To optimize the flow characteristics of the molten steel in the tundish and improve the quality of the billet, this paper used the CFD open source software OpenFOAM v8 to simulate the flow field in the five-strand tundish. Using water model experiments to verify the mathematical model, the results show that the error of the dead zone ratio is less than 2%. The flow field of prototype tundish shows that there is a short-circuit of molten steel at immersion nozzle 2# and 3#, and the dead zone ratio is 12.77%. It is necessary to optimize the structure of the tundish. According to the analysis of the flow field, it is proposed to add a dam and adjust the aperture and elevation angle of the two diversion holes. By comparing the simulated results of the molten steel flow characteristic parameters under 9 schemes of diversion hole, the best one is to add a dam between outlet 3# and 4#, expand the diameters of diversion hole B and C to 200 mm, and increase the elevation angle of diversion hole B. The results show that the dead zone ratio of the flow field in the optimized tundish can be reduced to about 2%.