中间包水模型数据的流出百分比分析方法

针对已有停留时间分布曲线或F曲线分析方法在归一化过程中，将单流中间包流出百分比或多流中间包中各流流出百分比之和限定为100%，将示踪剂流出总量信息掩盖，导致结果不精确的问题，本工作提出了流出百分比的分析方法，通过计算可以将物理实验结果转化为各流实时的流出百分比曲线。以流出百分比曲线为基础，计算得到时间加权平均方差和剩余示踪剂百分比，并以此对单流、四流中间包水模型实验结果进行分析。结果表明，采用流出百分比方法能对实验结果进行校对，进一步验证实验的可重复性。同时可对比双挡墙和U型挡墙控制装置设置下，四流中间包监测时间终点流出百分比差异及两倍理论停留时间时刻的死区比例大小。并可直观对比多流中间包不同挡墙下各流的一致性，及在单流堵塞后示踪剂在其他各流的分配及一致性。

Analysis method for outflow percentage of water model data of tundishes

Mixing phenomena by means of tracer technology are vitally important to understand the flow in metallurgical reactors, for example, continuous casting tundish. The widely used analysis methods are RTD (Residence Time Distribution) curve or F curve, which is a time dependent integral of RTD E curve. For the two methods, in the normalization process, the outflow percentage of a single-strand tundish or the summation of the outflow percentages of each strand in the multi-strand tundish are all limited to 100%. Thus, the total amount of tracer outflow information is concealed, which may lead to the problem of inaccurate results. This study proposes an analysis method of the outflow percentage, and proposes the calculation method to convert the physical experiment results into the real-time outflow percentage curve. In addition, based on the outflow percentage curve, the time-weighted average variance and the residual tracer percentage can be calculated and used to evaluate the uniformity of each strand and dead volume, respectively. In this study, the water model experimental data of a single-strand tundish and a four-strand delta shape tundish, which is installed by double weir or U-shaped weir, under normal condition and one strand blockage conditions are all analyzed by the proposed outflow percentage method. The results show that the experimental results can be proofread by using the outflow percentage method to further verify the repeatability of the water model experiments. Meanwhile, the difference in the percentage of outflow at the end of the monitoring time and the proportion of the dead zone at twice of the theoretical residence time can be compared in double weir four-strand tundish and U-shaped weir four-strand tundish. It can also intuitively compare the uniformity of each strand of different multi-strand tundishes, and the distribution and uniformity of the tracer in other outlets after one of the strands is blocked.