Numerical study on the hydrothermal characteristics of a wire-wrapped rod bundle with nonuniform wire pitches

IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2024-11-08 DOI:10.1016/j.pnucene.2024.105529

YaoDi Li , Mei Huang , Boxue Wang , Xiangyuan Meng , YanTing Cheng

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Abstract

In this study, thermal hydraulic behaviors in a 19-pin bundle fuel assembly with nonuniform wire pitches is investigated by combing CFD with the Kriging method. To optimize the design, two geometric variables—the ratio of inner pitch to reference pitch (Pi/P) and the ratio of outer pitch to reference pitch (Po/P)—are selected, and the design space is sampled using Latin Hypercube Sampling (LHS). The sampled points are then subjected to CFD analysis. Convergence is considered achieved when the residuals of all variables are below 1e-5. The optimization problem aims to minimize the objective function, which is a linear combination of the cross-sectional temperature difference and friction factor. Sequential Quadratic Programming (SQP) is employed to search for the optimal point using a constructed meta-model. When compared to the reference shape, the optimal shape exhibits higher axial velocity in the inner channel, higher average temperature, smaller temperature difference at the outlet section, and reduced pressure drop in the fuel assembly. The Kriging model accurately predicts the cross-sectional temperature difference and friction coefficient for the optimal shape, consistent with the CFD calculation results. This confirms the accuracy and feasibility of the Kriging model in fuel assembly optimization.

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关于具有不均匀线距的线包棒束水热特性的数值研究

在本研究中，通过将 CFD 与克里金法相结合，研究了具有不均匀线距的 19 针束燃料组件的热液压行为。为了优化设计，选择了两个几何变量--内节距与参考节距之比（Pi/P）和外节距与参考节距之比（Po/P），并使用拉丁超立方采样（LHS）对设计空间进行采样。然后对采样点进行 CFD 分析。当所有变量的残差低于 1e-5 时，即认为达到了收敛。优化问题旨在最小化目标函数，该函数是横截面温差和摩擦系数的线性组合。利用构建的元模型，采用序列二次编程（SQP）寻找最佳点。与参考形状相比，最佳形状显示出更高的内通道轴向速度、更高的平均温度、更小的出口段温差以及更小的燃料组件压降。克里金模型准确预测了最佳形状的横截面温差和摩擦系数，与 CFD 计算结果一致。这证实了克里金模型在燃料组件优化中的准确性和可行性。

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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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.