充气量和供料对脉冲级联稳态丰度分布的影响

Influence of holdup and feed in pulse cascades on the concentration distributions at steady state

脉冲级联是新提出的同位素分离级联的概念,了解脉冲稳态丰度分布是开发脉冲级联应用中的一个重要方面。为了明白稳态丰度分布的影响因素并加以利用,以提高脉冲级联的分离性能,利用一种结合了Q迭代法的时间推进方法求解脉冲级联的稳态丰度分布,并将分离效果用平均分离系数来整体描述。通过对矩形脉冲级联分离钨同位素的讨论,分析了充气量和供料对稳态丰度分布的影响。结果表明:级联的平均分离系数不随级联各级离心机充气量的变化而变化,但随着管道充气量与供料量之比的增加而增大;在级联中部存在一个最佳供料位置,使得平均分离系数最大。

The pulse cascade is a newly proposed cascade concept for isotope separation. Further understanding of the concentration distributions at steady state is needed to develop pulse cascades applications. The factors influencing the concentration distributions at steady state and the isotope separation in pulse cascades are analyzed using a time-marching method combined with the Q iteration method to compute the concentration distributions at steady state in the cascades. The influences of the holdup and feed are analyzed through the study of the separation of tungsten isotopes using square pulse cascades. The results show that the cascade average separation factor remains constant for different centrifuge holdups, but increases with increasing ratio of the pipe holdup to the feed. There is an optimum feed position in the middle stage in the cascade which yields the largest average separation factor.