总体分析法在非对称两流中间包水模型中的应用

Use of a Comprehensive Analytical Approach for Water Modeling of an Asymmetrical Two-Strand Tundish

为了解决经典组合方法处理多流中间包停留时间分布(RTD)曲线过程中出现的负死区体积分率问题,利用总体分析法对多流中间包各流的RTD曲线进行合成预处理,得到特征RTD曲线.然后利用经典组合方法处理特征RTD曲线,获得评价多流中间包流体流动的整体评价参数.非对称两流中间包水模型实验结果表明,Sahai修正方法仍会出现负死区体积分率现象;各流的流体平均停留时间是评价多流中间包各流一致性的特征参数;各流流体平均停留时间的最小值是评价多流中间包流体流动特性的关键参数.

If a classic combined approach is used to analyze the residue time distribution （RTD） curve in a tundish,the volume ratio of the dead zone in the multi-strand tundish sometimes is negative.In addressing this problem,a comprehensive analytical approach was used to pre-treat the RTD curve of each strand in the multi-strand tundish to get the characteristic RTD curve,and then a classic combined approach was used to treat the characteristic RTD curve,with the whole characteristic parameters obtained to determine fluid flow in the multi-strand tundish.The water model result for the RTD curve of an asymmetrical two-strand tundish showed that the negative volume ratio of the dead zone appeared with Sahai＇s revised approach.Mean residence time is the key parameter to estimate the similarity of flow characteristics of each strand in the multi-strand tundish.The minimum mean residence time for each strand is the key parameter to investigate the fluid flow in the multi-strand tundish.