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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。
Experiments on objects with repetitive structural features can only select some of the structures for experiments due to the limitation of experimental cost and experimental conditions. The main source of the differences in thermal-hydraulic properties between these structures and prototypes is the wall effect. Based on the idea of subchannel decomposition, a simple criterion for judging wall effect is proposed, which can provide a reasonable preliminary estimate for the selection of the number of repeating units in a repetitive structural component. Through the optimization analysis of the typical structure of the fuel assembly of the concept design of supercritical water cooled reactor (CSR1000) with an electric power of 1000 MW, the CFD numerical calculation is compared with that of CFD. The typical analysis of the 5 × 5 rod bundle structure using this method shows that the 5 × 5 rod bundle structure is an equilibrium selection considering the sidewall effect and the experimental cost.