Wall Effect Analysis Based on Subchannel Decomposition Method
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摘要: 对具有重复结构特征的对象进行实验研究时,由于实验成本和实验条件的限制,只能选取其中部分结构开展实验,这部分结构与原型在热工水力特性方面差异的主要来源是壁面效应。基于子通道分解的思想提出一种判断壁面效应的简单准则,可为重复结构类部件的重复单元数目的选取提供合理的初步估计。通过对电功率为1000 MW的超临界水冷堆概念设计方案(CSR1000)燃料组件典型结构的参数优化分析,并与计算流体力学(CFD)数值计算进行比较。利用该方法对5×5棒束结构进行的典型性分析表明,5×5棒束结构是综合考虑边壁效应和实验成本后的均衡选择。Abstract: When doing experiments with repeated structure elements, it is a routine to select part of it due to the limit of experimental cost and condition. This part of structure has differences with the original structure because of the wall effect in thermal hydraulic characteristics. In this study, a method to analyze the wall effect was proposed based on the subchannel decomposition idea. This method could be used as a rough prediction of experimental structure selection. In the geometrical parameter optimization of typical structure for CSR1000 rod assembly, the comparison with CFD results confirmed its validity. The typical analysis of 5×5 rod array was also performed with this method and it suggested that such structure was a balance choice between the wall effect and experimental cost.
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Key words:
- Repeated structure /
- Hydraulic diameter /
- Wall effect /
- Subchannel decomposition
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