高温熔盐印刷电路板式换热器的热工水力特性研究  

Thermal hydraulic performance analysis of printed circuit heat exchanger based on high temperature molten salt

作　　者：丁梦婷 陈玉爽[1,2] 傅远 DING Mengting;CHEN Yushuang;FU Yuan(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;CAS Innovative Academy in TMSR Energy System,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院先进核能创新研究院,上海201800 [3]中国科学院大学,北京100049

出　　处：《核技术》2024年第4期126-136,共11页Nuclear Techniques

基　　金：甘肃省科技重大专项"钍基熔盐堆关键装备与技术开发"(No.23ZDGH001);中国科学院战略先导专项(No.XDA02010000)资助。

摘　　要：印刷电路板式换热器(Printed Circuit Heat Exchanger,PCHE)换热效率高,结构紧凑,可作为小型模块化熔盐堆热量传输的关键设备,对其流动换热特性的研究具有重要意义。采用数值模拟方法,以翼型通道的熔盐(FNaBe)-氦气换热器为研究对象,通过计算流体动力学(Computational Fluid Dynamics,CFD)数值模拟计算对其熔盐侧的传热特性和阻力特性进行对比分析,分别得到不同温度、翅片类型和不同节距结构下的熔盐(FNaBe)-氦气换热器的流动换热特性,并与传统直通道结构对比进行综合评估。研究结果表明,数值模拟的计算结果与实验结果对比符合较好,翼型翅片流道结构相较于直通道结构能够强化传热、降低阻力,其中节距为8 mm的NACA0025翼型翅片流道结构的流动传热特性最好。本研究建立的数值模拟方法能够用于印刷电路板式换热器的流动传热特性的预测,拟合出节距为8 mm的NACA0025翼型翅片结构的经验关联式,为后续换热器的设计提供理论基础。[Background]The printed circuit heat exchanger(PCHE)has high heat transfer efficiency and compact structure,which can be used as the key equipment for heat transfer of small modular molten salt reactor,It is of great significance to the study of its flow heat transfer characteristics.[Purpose]This study aims to explore the heat transfer characteristics of printed circuit heat exchanger and compare numerical simulation result with experimental data.[Methods]The flow heat transfer characteristics of molten salt(FNaBe)-helium heat exchangers with different flow channel structures,fin types and pitch were obtained by CFD numerical simulation,and the results were compared with those of traditional straight channel structures for comprehensive evaluation.The main thermal performance parameters of the heat exchanger with various airfoil fin structures were verified by experiment to find the best structure.[Results]The results show that the numerical simulation results are in good agreement with the experimental results.Compared with the traditional straight channel structure,the fins can strengthen the heat transfer characteristics of the heat exchanger and reduce the flow resistance.NACA0025-8 mm airfoil fin structure has the best flow heat transfer characteristics.[Conclusions]The numerical simulation method established in this study can be used to predict the flow heat transfer characteristics of printed circuit heat exchanger.The empirical correlation formula of NACA0025-8 mm airfoil fin structure is fitted,which provides a theoretical basis for the design of subsequent heat exchangers.

关 键 词：印刷电路板式换热器 熔盐 流动换热特性 数值模拟 

分 类 号：TL99[核科学技术—核技术及应用]