非稳态流动下浮动核反应堆管内热工水力特性数值研究  

Numerical study of thermal-hydraulic characteristics in pipe of floating nuclear reactor under pulsating flow

作　　者：姚尧 李超 祁沛垚 张瑞祥[1] 叶林[2] 常重喜 马喜强 YAO Yao;LI Chao;QI Peiyao;ZHANG Ruixiang;YE Lin;CHANG Chongxi;MA Xiqiang(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;Huaneng Shandong Shidao Bay Nuclear Power Co.,Ltd.,Weihai 264312,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]华能山东石岛湾核电有限公司,山东威海264312

出　　处：《热力发电》2024年第2期93-100,共8页Thermal Power Generation

基　　金：陕西省自然科学基金项目(2023-JC-QN-0611)。

摘　　要：受海洋条件影响,浮动核反应堆(FNR)回路冷却剂会发生周期性流量波动现象,影响系统热工水力特性。通过理论推导和数值模拟相结合的方式,研究了脉动流条件下管内速度与温度分布特性,并对比了不同数值模拟边界条件对脉动流条件下圆管内速度和温度分布的影响。结果表明:高频脉动流条件下,管内层流在壁面附近会出现回流现象,并且壁面效应会随着脉动频率的增大而增大,使用脉动速度入口和压力出口作为数值模拟边界条件无法预测出这一回流现象,而使用波动的压力入口和流量出口可以捕捉高频脉动流的回流现象;脉动流条件下,管内温度波动幅度随脉动频率的增大而逐渐减小;数值模拟较好地模拟脉动流条件下管内的温度,误差小于2%,为使用数值模拟方法准确预测脉动流流场与温度场提供参考。Under oceanic conditions,the coolant in the loop of a floating nuclear reactor(FNR)experiences periodic fluctuations,which affects the system’s thermal and hydraulic characteristics.A combination of theoretical derivation and numerical simulation is employed to investigate the velocity and temperature distribution characteristics within a pipe under pulsating flow conditions.Moreover,the influence of different numerical simulation boundary conditions on the velocity and temperature distribution in a circular tube under pulsating flow is compared.The results show that,under high-frequency pulsating flow conditions,laminar flow inside the pipe will experience backflow near the wall,and the wall effect will increase with the pulsation frequency.Using pulsating velocity inlet and pressure outlet as numerical simulation boundary conditions fails to predict this backflow phenomenon.However,employing fluctuating pressure inlet and flow outlet effectively captures the backflow occurrence in high-frequency pulsating flow.Concurrently,the temperature within the pipe fluctuates under pulsating flow conditions,and the amplitude of temperature fluctuations gradually decreases when the pulsation frequency increases.Numerical simulation can well simulate the temperature distribution in the pipe under pulsating flow conditions,with an error of less than 2%.The research results can provide reference for non-stationary numerical simulation methods.

关 键 词：脉动流 数值模拟 速度分布 温度分布 浮动核反应堆 

分 类 号：TL333[核科学技术—核技术及应用]