超临界水四棒束传热数值分析  

Numerical Simulation of Heat Transfer to SCW in 4-rod Bundle

作　　者：许多挺 李虹波[2] 杨珏[2] 顾汉洋[1] 

机构地区：[1]上海交通大学核科学与工程学院,上海200240 [2]中科华核电技术研究院有限公司,广东深圳518026

出　　处：《原子能科学技术》2015年第2期292-296,共5页Atomic Energy Science and Technology

摘　　要：超临界水冷堆(SCWR)开发的关键是棒束内超临界水(SCW)的热工水力特性。本文针对超临界水四棒束流动传热实验进行CFD数值模拟,SSG湍流模型的计算结果与实验结果吻合良好。分析结果表明,流动方向对棒束截面内流量分布有显著影响。与下降流相比,尽管上升流时棒束间流动搅混较弱,但上升流时棒束截面流量及壁面周向温度分布更加均匀,加热棒壁面温度更低。可见,棒束横截面上的流量分布是影响加热棒壁面流动传热的主要因素。A key issue of SCWR development is the thermal hydraulic characteristics of supercritical water（SCW）flowing in rod bundles.The heat transfer of SCW in a 4-rod bundle was numerically simulated by CFD in this study.The SSG turbulent model was selected and a reasonable prediction was achieved comparing with the experimental data.The simulated results show that the flow direction has great impact on the flow rate distribution at cross section.Comparing with the downward flow,the upward flow has more uniform flow rate distribution and circumferential temperature distribution which results in lower wall temperature,though its flow mixing in the bundle is relatively weak.It indicates that the convective heat transfer on heating wall is mainly influenced by flow rate distribution in the cross-sectional flow area of bundles.

关 键 词：超临界水 棒束 传热 流动方向 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]