环形通道加热器内FLiNaK盐的流动与传热特性研究  

Flow and heat transfer characteristics of FLiNaK salt in an annular channel heater

作　　者：杨洋[1,2] 邹杨 陈金根[1,2] 周翀 YANG Yang;ZOU Yang;CHEN Jingen;ZOU Chong(Shanghai Institute of Applied Physics,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]中国科学院大学,北京100049

出　　处：《核技术》2022年第7期107-115,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：钍基熔盐堆缩比仿真装置是10 MW钍基熔盐固态试验堆的1/3缩比仿真装置,其设计功率为370 kW。19支加热管外缠绕螺旋线圈的环形通道加热器已用于仿真装置堆芯的加热。为了进一步理解加热管外径及环形通道的宽度对环形通道加热器性能的影响,采用Fluent软件分析了环形通道加热器在不同加热管外径及环形通道宽度下的流动与传热特性。利用熵产原理分析了环形通道加热器的整体性能。结果表明:由于螺旋线圈的存在,环形通道内的FLiNaK盐产生了轴向速度、径向速度及切向速度,同时环形通道内纵截面上出现逆流。加热管的外径对环形通道内FLiNaK盐的流动及传热特性无影响,加热管外径越大,环形通道加热器的能量利用率越高。环形通道宽度越大,环形通道内FLiNaK盐的压损越小,对流换热系数越小,环形通道加热器的能量利用率越低。[Background]The simulation device is one-third scale of the 10 MW solid-fuel thorium molten-salt reactor(TMSR)and has the rated heat power of 370 kW.Nineteen annular channel heaters with wire coil were designed to heat the simulation device to the desired temperature.[Purpose]This study aims to further investigate the effect of outer diameter of heating tube and annular width on the flow and heat transfer characteristics of FLiNaK salt in the annular channel heater.[Methods]The flow and heat transfer characteristics of annular channel heater with wire coil were simulated by using Fluent software.The effects of outer diameter of heating tube on the flow and temperature fields were investigated numerically,so did the effects of annular width on the flow and heat transfer characteristics.The overall performance of annular channel heater was evaluated by the principle of entropy production.[Results]The simulation results show that the axial velocity,radial velocity and tangential velocity are generated and meanwhile counter-flow is formed on longitudinal section.[Conclusions]The outer diameter of heating tube has no effect on the flow and heat transfer characteristics.The larger the outer diameter of heating tube,the higher the energy efficiency.As the increase of the annular width,the pressure loss,the heat transfer coefficient decreases,and the energy efficiency gradually decreases.

关 键 词：螺旋线圈 环形通道加热器 FLiNaK盐 流动及传热特性 能量利用率 

分 类 号：TL33[核科学技术—核技术及应用]