C形换热器一二次侧流动传热耦合特性数值模拟研究  

Numerical Simulation on Coupling Flow and Heat Transfer Characteristics of Primary and Secondary Side of C-shaped Heat Exchanger

作　　者：褚文俊 朱宏晔 成翔[2] 刘洋 段日强 CHU Wenjun;ZHU Hongye;CHEN Xiang;LIU Yang;DUAN Riqiang(Institute of Nuclear and New Energy Technology,Collaborative Innovation Center of Advanced Nuclear Energy Technology,Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Tsinghua University,Beijing 100084,China;Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]清华大学核能与新能源技术研究院,先进核能技术协同创新中心,先进反应堆工程与安全教育部重点实验室,北京100084 [2]中国核动力研究设计院,四川成都610213

出　　处：《原子能科学技术》2022年第12期2533-2542,共10页Atomic Energy Science and Technology

摘　　要：C形换热器是第三代反应堆非能动余热排出系统中的主要设备。为研究其一、二次侧流动传热耦合特性,本文建立了C形换热器全尺寸物理模型,进行了不同结构参数和热工条件下的数值模拟研究,获得了一次侧流场的温度、速度、压力分布以及传热管间的流量分配变化规律,分析了进口流量、进口温度、进口位置等对流量分配和流动阻力分布的影响,以及浮升力和惯性力对流量分配的影响机理。结果表明,流量分配不均主要由热虹吸现象导致,且进口管道位置对于流量不均匀性的改善不明显。The third generation reactors have characteristics of safety and efficiency, and the C-shaped heat exchanger is the main equipment in the design of the third generation reactor, which is widely used in the design of the passive residual heat removal system. It is of great significance on reactor safety to study on the flow and heat transfer process of C-shaped heat exchanger. To study the coupling flow and heat transfer characteristics of its primary and secondary side, and also to obtain flow distribution mechanism in heat exchange pipes for optimizing structure design, a full-size physical model of C-shaped heat exchanger was established in this paper. It included inlet-outlet-housings, inlet-outlet pipes and 500 heat transfer pipes as the primary side, and the heat transfer model of the secondary side was also established. Numerical simulation studies under different thermal and geometric conditions were conducted by the software FLUENT to obtain the laws of temperature, speed, pressure and flow distribution between the heat transfer tubes in primary side. At the same time, the influence of inlet flow, inlet temperature, inlet position to the flow distribution and flow resistance distribution was analyzed, and the affecting mechanism of floating force and inertial force on flow distribution was also analyzed. The calculation results show that the current design of the heat transfer tube is uneven in flow distribution, the flow of inner side is low, the flow of outer side is high, and the inner layer has the phenomenon of reverse flow. The uneven flow distribution in the current design is mainly caused by thermosiphon(density difference causing gravity pressure difference). This phenomenon is more obvious when inlet flow is low or the inlet temperature is high. During the range of the thermal parameters in this paper, the phenomenon of the thermosiphon is always dominated in the influencing mechanisms of flow distribution. Three inlet pipe positions of 0°(existing design), 90° and 180° were compared and it i

关 键 词：C形换热器 流动传热耦合 数值模拟 流量分配 

分 类 号：TK314[动力工程及工程热物理—热能工程]