Study of cross-flow characteristics in sub-channels with numerical simulation

IF 2.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Annals of Nuclear Energy Pub Date : 2025-09-03 DOI:10.1016/j.anucene.2025.111856

Weihua Liao , Wanzong Li , Longxiang Zhu , Zaiyong Ma

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引用次数: 0

Abstract

The study of the cross-flow mixing effects between adjacent sub-channels in an open channel is significant for quantifying the net mass transfer and the resulting momentum and energy exchange between channels in the fuel assembly. This paper investigates the local physical characteristics of cross-flow in a 1 × 2 rod bundle sub-channel without and with grids using numerical simulation. It focuses on analyzing the lateral flow under two scenarios: differences in inlet flow rates and differences in outlet flow rates. The analysis of the pressure differential across the channels and the distribution of cross-flow velocity reveals that the pressure differential exhibits an exponential variation trend along the axial direction in both scenarios. Additionally, this paper fits empirical relationships for the lateral cross-flow friction coefficient under different mainstream velocities. It compares the differences in friction coefficients between the two scenarios and the influence of various mainstream velocities on the friction coefficient. Moreover, the comparison of the total cross-flow between channels with and without a grid shows that the cross-flow with the grid is greater than the cross-flow without a grid under the same condition, indicating that the existence of a grid can enhance the cross-flow between sub-channels and balance the uneven flow between sub-channels.

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子通道交叉流动特性的数值模拟研究

研究明渠中相邻子通道间的交叉流动混合效应对于量化燃料组件中净传质和由此产生的通道间动量和能量交换具有重要意义。本文采用数值模拟的方法研究了1 × 2棒束子通道内无栅格和有栅格两种情况下横流的局部物理特性。重点分析了进口流量不同和出口流量不同两种情况下的横向流动。通过对通道内压差和横流速度分布的分析，发现两种情况下通道内压差沿轴向均呈指数变化趋势。此外，本文拟合了不同主流速度下横向横流摩擦系数的经验关系式。比较了两种情况下摩擦系数的差异以及不同主流速度对摩擦系数的影响。此外，通过对有网格和不加网格的通道间总横流的比较可知，在相同条件下，有网格的通道间横流大于无网格的通道间横流，说明有网格的存在可以增强子通道间的横流，平衡子通道间的不均匀流动。

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

Annals of Nuclear Energy 工程技术-核科学技术

CiteScore

4.30

自引率

21.10%

发文量

632

审稿时长

7.3 months

期刊介绍： Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.