宽板坯浸入式水口优化的物理模拟

通过水模型研究方法，对某钢厂200mm×1800mm连铸机结晶器内流体的流动行为进行了研究，在此基础上对水口的结构参数和工艺参数进行了优化。研究结果表明：①拉坯速度、水口底部形式、水口出口形状、出口角度、出口面积比以及浸入深度等参数对结晶器内流场有重要影响，在对其进行优化研究时应综合考虑；②在试验条件下，结晶器优选出的新型浸入式水口的最佳结构参数为：水口倾角15°，出口面积比2.0，出口形状为跑道形，底部形状为平底，结合现场生产实际建议浸入深度为125mm，拉速为1.45m/min。

Water Modeling Experiment of Slab Immersion Nozzle Optimization

For the sake of improving the flow field in the mould, physical modeling method is used to research the flow field in the mould for sectional width 200mm×1800mm based on a steel works. Then the study of optimization of the nozzles’ structure and technical parameters was made. The results show that: 1) Casting speed, the shape of the exit, bottom shape of the nozzle, immersion depth, oblique angle of the nozzle exit and area radio of the exit have great influence over the flow field in the mould. When doing the study of optimization, the above should be considered. 2) In the laboratory, the optimum nozzles’ structure parameters is that the oblique angle of the nozzle exit is 15°, area radio of the exit is 2.0, the shape of the exit is racetrack, bottom shape of nozzle is flat-bottom. Considering of the real production, the immersion depth is considered to be 125mm and casting speed is 1.45m/min.