Analytical and Computational Analysis of Flow Splitting in Multiple, Parallel Channels Systems

A. Lazarte, J. Ferreri
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引用次数: 1

Abstract

Previous analytical results on flow splitting are generalized to consider multiple boiling channels systems. The analysis is consistent with the approximations usually adopted in the use of systems codes (like RELAP5 and TRACE5, among others) commonly applied to perform safety analyses of nuclear power plants. The problem is related to multiple, identical, parallel boiling channels, connected through common plena. A theoretical model limited in scope explains this flow splitting without reversal. The unified analysis performed and the confirmatory computational results found are summarized in this paper. New maps showing the zones where this behavior is predicted are also shown considering again twin pipes. Multiple pipe systems have been found not easily amenable for analytical analysis when dealing with more than four parallel pipes. However, the particular splitting found (flow along N pipes dividing in one standalone pipe flow plus N -1 identical pipe flows) has been verified up to fourteen pipes, involving calculations in systems with even and odd number of pipes using the RELAP5 systems thermal-hydraulics code.
多平行通道系统中流动分裂的分析与计算分析
将以往关于流动分裂的分析结果推广到考虑多沸腾通道系统。该分析与通常用于执行核电厂安全分析的系统代码(如RELAP5和TRACE5等)通常采用的近似一致。这个问题与多个相同的平行沸腾通道有关,这些通道通过共同的全气池连接。一个有限范围的理论模型解释了这种无反转的流动分裂。本文对所进行的统一分析和得到的验证计算结果进行了总结。新的地图显示了预测这种行为的区域,同样考虑到双管道。当处理超过四个平行管道时,发现多个管道系统不容易进行分析分析。然而,发现的特殊分裂(沿N根管道的流动在一个独立的管道流中划分,加上N -1个相同的管道流)已经被验证了多达14根管道,包括使用RELAP5系统热工水力学代码对偶数和奇数管道的系统进行计算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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