Abstract: To solve the problems of poor flow field distribution and uneven quality of each stream caused by the unreasonable structure of the orifice of the ten-stream tundish turbulence inhibitor in a steel plant, an experimental 1:3 hydraulic model was established to conduct water model tests by using the similarity principle. On the basis of different orifice structures, the uniformity of each stream was considered fully and then the optimal structure of the orifice and the effect of the orifice structures on the tundish flow field were obtained by means of the comprehensive analysis of the residence time distribution curves of liquid in the tundish and the display characteristics of the flow field. Experimental results showed that for the long-distance and multi-stream tundish of no weir structure, the size, quantity, and direction of the inner diameter of the orifice of the turbulence inhibitor all affected the flow field of the tundish, and the effect of the inner diameter of the orifice was the most significant. The inner diameter of the optimal orifice designed in this work reduced from 53 mm to 30 mm in the prototype, the dead zone ratio reduced from 54.05% to 34.69%, the maximum standard deviation of the F curve reduced from 0.0154 to 0.0035, the flow field of the tundish was improved, and the flow field of each flow was improved. The uniformity among the streams was significantly improved. The number of orifices increased from 1 to 3, the proportion of dead zone increased from 34.69% to 46.05%, and the maximum standard deviation of the F curve increased from 0.0035 to 0.0062. The more the number of orifices was, the higher the proportion of dead zone in the flow field was. The larger the value was, the worse the consistency of the flow field of each nozzle was. For the long-distance and multi-stream tundish, it was recommended to improve the flow field of the tundish by appropriately changing the inner diameter of the orifice, reducing the number of orifices.

Key words: tundish, turbulence inhibitor, orifice, physical simulation, flow field

摘要： 针对某钢厂十流中间包紊流抑制器注流孔结构不合理引起流场分布差、各流铸坯质量不均的问题，运用相似原理，使用相似比为1:3的物理模型进行水模型实验，设计不同的注流孔结构研究流体在中间包的平均停留时间曲线及流场显示特征，明晰注流孔结构对中间包流场的影响规律，优化紊流抑制器注流孔结构，达到中间包流场优化及浸入式水口各流一致性提高的目标。结果表明，长距离多流中间包在无堰坝结构条件下，紊流抑制器的注流孔内径尺寸、数量及开孔方向对中间包流场都有影响，注流孔内径的影响最为显著，数量次之。设计的最佳注流孔内径由原型的53 mm缩小至30 mm，死区比例由54.05%降至34.69%，F曲线最大标准差由0.0154降低至0.0035，中间包流场得到改善，各流一致性显著提高。当注流孔数量由1个增加至3个，死区比例由34.69%增大至46.05%，F曲线最大标准差由0.0035增大到0.0062，注流孔数目越多，流场死区比例反而越大，各水口流场的一致性越差。对长距离多流中间包，建议主要通过适当改变注流孔内径及减少孔数来改善中间包流场，提高各流一致性。

关键词: 中间包, 紊流抑制器, 注流孔, 物理模拟, 流场