Numerical simulation of thermal-hydraulic characteristics in a closed natural circulation system

3rd International Conference on Energy Engineering and Environmental Protection

能源学;生态环境科学

Wang, Qiang^1 ; Gao, Puzhen^1 ; Xu, Yuting^1^2^3 ; Zhang, Yinxing^1 ; Lin, Yuqi^1 ; Wang, Zhongyi^1

Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, College of Nuclear Science and Technology, Harbin Engineering University, Harbin, Heilongjiang

150001, China^1

Chinese Academy of Customs Administration, Qinhuangdao, Hebei

066004, China^2

Institute of Nuclear and New Energy Technology (INET), Tsinghua University, Beijing

100084, China^3

关键词: Equilibrium state;    Flow instabilities;    High-pressure condition;    Natural circulation;    Natural circulation system;    Passive technologies;    Thermal hydraulics;    Two phase systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/227/2/022001/pdf
DOI  :  10.1088/1755-1315/227/2/022001

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In order to enhance the safety of nuclear energy, natural circulation served as a passive technology is widely used. Accordingly, an investigation associated with thermal-hydraulic characteristics for natural circulation system is made in this work. Numerical simulation based on RELAP5 code is performed especially for flow instability phenomenon. The results indicate that flashing and condensation are two important factors for low pressure natural circulation two-phase system. For all this, the tolerance of natural circulation to flashing oscillation could be enhanced effectively with the increase of system pressure. Under high pressure condition, the flowrate might shrink to a new equilibrium state from flashing-induced oscillation. The simulation results and analysis could contribute to a more extensive utility of natural circulation mechanism for nuclear energy.