基于四方程模型的LBE环管湍流换热数值研究  

Numerical Study on Turbulent Heat Transfer of LBE in Annulus Based on Four-equation Model

作　　者：苏兴康 顾龙[1,2,3] SU Xingkang;GU Long(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China;School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]中国科学院近代物理研究所,甘肃兰州730000 [2]中国科学院大学核科学与技术学院,北京100049 [3]兰州大学核科学与技术学院,甘肃兰州730000

出　　处：《原子能科学技术》2022年第4期635-645,共11页Atomic Energy Science and Technology

基　　金：国家重点研发计划(2020YFB1902100);上海市经济和信息化委员会专项(GYQJ-2018-2-02)。

摘　　要：为计算液态铅铋(LBE)在环管内不同加热环境下的湍流换热,基于开源计算流体力学程序OpenFOAM开发了四方程模型求解器4eqnFoam。将LBE在平板和圆管内的预测结果与直接数值模拟结果和实验结果进行对比,验证了求解器的有效性。基于该求解器,分别计算了LBE在外壁绝热内壁加热以及内外壁面等热流加热环管内不同雷诺数下的湍流换热量。结果表明:随着雷诺数的增加,两种加热条件下的无量纲温度脉动、雷诺热流、湍流热扩散作用增大,而平均湍流普朗特数减小;当雷诺数增加到一定程度时,平均湍流普朗特数变化不明显。基于4eqnFoam求解器,可为计算LBE热工水力现象提供更多参考。To calculate the turbulent heat transfer of liquid lead-bismuth(LBE) under different heating conditions in an annulus, a four-equation model solver 4 eqnFoam was developed based on the open-source computational fluid dynamics program OpenFOAM. The prediction results of LBE in a plane and a pipe were compared with the results of direct numerical simulation and experiment, and the effectiveness of the solver was verified. Based on the solver, the turbulent heat transfers of LBE at different Reynolds numbers in an annulus with adiabatic outer wall and heated inner wall and an annulus with equal heat flux on the inner and outer wall were calculated respectively. The results show that with the increase of Reynolds numbers, the dimensionless temperature fluctuation, Reynolds heat flux, and turbulent heat diffusion of LBE in the annulus increase, while the mean turbulent Prandtl number decreases. When the Reynolds number increases to a certain extent, the mean turbulent Prandtl number does not change significantly. Based on the 4 eqnFoam solver, more references can be provided for the calculation of LBE thermal-hydraulic phenomena.

关 键 词：液态铅铋 湍流换热 四方程模型 OPENFOAM 

分 类 号：TL334[核科学技术—核技术及应用]