矩形窄缝通道入口堵流的PIV实验研究  

PIV Flow Measurement in a Rectangular Narrow Channel with Inlet Blockage

作　　者：姚维一 曲文海 熊进标[1] 张滕飞 柴翔[1] 刘晓晶[1] YAO Weiyi;QU Wenhai;XIONG Jinbiao;ZHANG Tengfei;CHAI Xiang;LIU Xiaojing(Shanghai Jiao Tong University,Shanghai,200240,China)

机构地区：[1]上海交通大学核科学与工程学院,上海200240

出　　处：《核科学与工程》2021年第5期1016-1022,共7页Nuclear Science and Engineering

摘　　要：板式燃料元件堆芯结构紧凑,传热效率高,但燃料板间窄缝通道易发生堵塞事故,造成局部传热欠佳。针对矩形窄缝通道入口堵流,利用粒子图像测速技术(PIV)开展常温常压不同雷诺数下(2400~9600)25%堵塞份额的流场测量实验。分析堵塞体下游时均速度场、涡量场、脉动速度场,探讨入口堵流对窄缝通道内流场特性的影响和雷诺数效应。研究发现,入口堵流下游流场可分为主流区、剪切层、回流区、低速区、再附区、恢复区。与主流区相比,其他区域流速低,剪切流动在回流区内产生一对漩涡,再附区后流动逐渐趋向于稳定,高湍流脉动速度与高雷诺剪切应力主要分布于剪切层和漩涡中,流动雷诺数效应显著,随着雷诺数增大,回流区、低速区高湍流强度区域面积增大,再附区、再发展区向下游移动。Plate-type fuel assembly leads to high heat transfer efficiency and consequently compact cores.However,the rectangular narrow channel between fuel plates is prone to get blocked,which results in local heat transfer deterioration.Particle image velocimetry(PIV)technique is employed to measure the velocity field in a rectangular narrow channel with 25%inlet blockage area at different Reynolds number(2400-9600)at room temperature and pressure.Distribution of mean velocity,vorticity,turbulent fluctuation velocity is analyzed downstream of the blockage in order to investigate influence of inlet blockage on the flow field and the Reynolds number effect.It is found that in a rectangular narrow with inlet blockage the flow field can be divided into six regions:main flow region,shear layer,recirculation region,reattachment region,low velocity region and attached or recovery region.Comparing with the main flow region,the other regions have lower flow velocity.Shear flow produces a pair of eddies,and flow gradually stabilizes after reattachment.The flow has great Reynolds number effect.

关 键 词：矩形窄缝通道 入口堵塞 粒子成像测速 流场分布 

分 类 号：TL334[核科学技术—核技术及应用]