摇摆条件下矩形堆芯通道内的传热特性数值模拟  

Numerical Simulation of Heat Transfer Characteristics in Rectangular Core Channel Under Rolling Condition

作　　者：邹晨昊 李冬 黄瑞宇 ZOU Chenhao;LI Dong;HUANG Ruiyu(School of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海200090

出　　处：《上海电力大学学报》2024年第6期533-540,共8页Journal of Shanghai University of Electric Power

摘　　要：船用一体化小型反应堆在海洋条件下会发生摇摆、起伏、倾斜等工况,分析海洋工况下船用窄矩形堆芯通道的传热特性对反应堆安全运行具有重要意义。采用三维计算流体力学(CFD)软件对典型船用矩形燃料组件结构进行建模,利用用户自定义函数(UDF)引入摇摆工况并修正了传热模型。与原模型相比,修正模型更适用于海洋摇摆工况。基于对给定功率分布条件下壁面温度、Nu数、空泡份额、协同角等参数的分析,认为矩形通道窄边的存在,使得静止工况下矩形通道壁面两侧窄边附近会形成角部温度峰值,摇摆工况下与摇摆加速度同方向一侧的角部峰值将会有所提高。此外,增大摇摆角度或减小摇摆周期可以优化管道内换热。Marine integrated small reactors can experience swaying,undulating,and tilting conditions under ocean conditions.Analyzing the heat transfer characteristics of narrow rectangular core channels in marine conditions is of great significance for the safe operation of reactors.Three-dimensional CFD software is used to model a typical rectangular fuel assembly structure for ships.UDF is used to introduce rolling conditions and modify the heat transfer model.Compared with the original model,the modified model is better suited for ocean rolling conditions.Based on the analysis of parameters such as wall temperature,Nu number,void fraction,and synergy angle under given power distribution conditions,it is believed that due to the existence of narrow edges in the rectangular channel,corner temperature peaks form near the narrow edges on both sides of the rectangular channel wall under static conditions,and the corner peak on the same direction as the swing acceleration increases under swing conditions.In addition,increasing the swing angle or reducing the swing period can optimize the heat transfer inside the pipeline.

关 键 词：矩形堆芯通道 摇摆条件 Fluent软件 单相和两相传热模型 场协同原理 

分 类 号：TL364.4[核科学技术—核技术及应用]