熔盐空间堆斯特林加热器的设计与数值模拟  

Design and numerical simulation of Stirling heater for molten salt space reactor

作　　者：赵恒 邹杨[1] 戴叶[1] 徐洪杰[1] 张洁[1] 何帆 ZHAO Heng;ZOU Yang;DAI Ye;XU Hongjie;ZHANG Jie;HE Fan(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049 [3]上海科技大学,上海201210

出　　处：《核技术》2020年第10期57-65,共9页Nuclear Techniques

基　　金：中国科学院战略性先导科技专项(No.XDA02010000);钍铀燃料循环特性和若干关键问题研究项目(No.QYZDY-SSW-JSC016)资助。

摘　　要：熔盐-斯特林加热器用于熔盐空间堆发电系统的热量获取。为提高加热器的换热能力,设计了翅片式熔盐通道与多孔式斯特林内部热接收器,使用计算流体力学软件Fluent对不同结构的翅片与熔盐通道开展了数值模拟研究。结果表明:在熔盐通道内增加翅片可以提高斯特林加热器的换热能力,并且随着翅片高度的增加与翅片间距的减小,换热能力进一步提高,与无翅片结构相比,换热功率最大提升了76.2%。对比径向入口、切向入口与双径向进出口三种通道结构,径向入口通道的热流密度随着高度的增加,最大增幅为73.3%;切向入口通道的热流密度沿高度增幅为35.1%,但其在相同高度下的热流密度差异显著;双径向进出口通道的热流密度随着高度的增大先减小后增大,其增幅为40.5%;在换热能力方面,双径向进出口通道的换热功率与换热系数最高。研究可为熔盐空间堆斯特林加热器的设计提供一定的参考。[Background]Stirling heater is used for heat capture in the molten salt space reactor power generating system,and its heat transfer performance has a great influence on the output power and efficiency of the space reactor energy conversion system.[Purpose]This study aims to improve the heat transfer performance of the heater by numerical simulation of designed fins in molten salt channel and porous Stirling internal thermal receiver.[Methods]The computational fluid dynamics program Fluent was employed to design and optimize the structure of the heater.Thermal-hydraulic characteristics of different fins and molten salt channel types,such as flow field,pressure field and heat flux distribution were simulated and compared.[Results]Adding fins in the molten salt channel can improve the heat transfer performance of the Stirling heater,and with the increase of fin height and the decrease of fin spacing,the heat transfer performance further improves.Compared with radial inlet and tangential inlet,the double-radial inlet and outlet channels have more uniform heat flux distribution and better heat transfer performance.[Conclusions]The results of this study provide useful references for the design of the Stirling heater in molten salt space reactor.

关 键 词：斯特林加热器 结构设计 数值模拟 换热能力 

分 类 号：TL33[核科学技术—核技术及应用]