摇摆条件下棒束通道自然循环换热特性实验研究  

Experimental Study on Heat Transfer Characteristics of Rod Bundle Channel in Natural Circulation under Rolling Motion Condition

作　　者：李鑫[1] 王爽[1] 谭思超 乔守旭 田瑞峰 程坤 LI Xin;WANG Shuang;TAN Sichao;QIAO Shouxu;TIAN Ruifeng;CHENG Kun(Heilongjiang Provincial Key Laboratory of Nuclear Power System&Equipment,Harbin Engineering University,Harbin 150001,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]哈尔滨工程大学黑龙江省核动力装置性能与设备重点实验室,黑龙江哈尔滨150001 [2]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610213

出　　处：《原子能科学技术》2024年第8期1742-1749,共8页Atomic Energy Science and Technology

基　　金：国家自然科学基金(12275059,12005215)。

摘　　要：棒束燃料组件是浮动堆的燃料形式之一,浮动堆在运行期间受风浪等影响会发生起伏、摇摆等运动,导致系统流量、压降等热工参数发生周期性波动,影响棒束通道内流动换热特性。针对摇摆条件下自然循环系统棒束通道传热问题,开展了摇摆运动工况下棒束通道换热特性实验研究。结果表明:摇摆运动会增强系统平均换热性能,使得平均换热系数发生周期性波动,功率越高,相对波动幅度越小;对于子通道局部换热特性,其受二次流影响较大,以通道中央为轴,摇摆运动会增强靠近摇摆轴一侧子通道内局部换热性能,降低远离摇摆轴一侧;功率越大,子通道局部换热系数波动越小。Affected by sea wind and waves,the floating nuclear power plant(FNPP)would be in rolling motion during operation.The rolling motion will introduce fluctuated inertial force periodically,resulting in periodic thermal and hydraulic parameters variation,and may threaten the safety of the reactor.To investigate the influence of rolling motion on the heat transfer characteristics in the rod bundle channel under natural circulation condition,an experimental system with a 5×5 rod bundle channel was design and built on a rolling platform.An experimental investigation was conducted to study the influence of rolling motion on heat transfer in 5×5 rod bundle channels under rolling motion.The transient heat transfer characteristics of natural circulation in rod bundle were obtained.Experimental results demonstrate that the rolling motion induces periodic oscillations in the flow rate of the system.Furthermore,it is observed that with an increase in heating power,there is a reduction in the relative amplitude of these flow rate fluctuations.Consequently,this leads to periodic variations in Nu,accompanied by a corresponding decrease in relative fluctuation amplitude as well.The fluctuant flow disturbances disrupt the boundary layer and yield an enhancement of approximately 5%in the heat transfer coefficient.Regarding the local heat transfer characteristics,the incorporation of rolling motion introduces secondary flow which can significantly alter them.The presence of gravity and centrifugal force field fluctuations with a period half that of the rolling period leads to a local Nu curve with two peaks.With the center of the rod bundle channel as the axis,reverse phase fluctuations occur on both sides of the channel.The heat transfer performance is enhanced in subchannels near the rolling axis due to the rolling motion,but it diminishes away from that axis.The secondary flow induced by rolling motion amplifies velocity fluctuation amplitude in subchannels close to the rolling axis.Local Nu increases with an increase in power,w

关 键 词：摇摆运动 棒束通道 自然循环 子通道 换热特性 

分 类 号：TL333[核科学技术—核技术及应用]