Numerical investigations of thermal mixing performance of a hot gas mixing structure in high-temperature gas-cooled reactor

作     者：Yang-Ping Zhou Peng-Fei Hao Xi-Wen Zhang Feng He 

作者机构：Institute of Nuclear and New Energy Technology The Key Laboratory of Advanced Reactor Engineering and SafetyMinistry of Education Tsinghua University School of Aerospace Tsinghua University 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2016年第27卷第1期

页      面：149-155页

核心收录：

学科分类：08[工学] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 

基　　金：Supported by National Natural Science Foundation of China (No. 11375099) 

主　　题：高温气冷堆 混合性能 混合结构 热气体 数值研究 计算流体动力学 数值模拟 热气导管 

摘      要：A numerical simulation study was performed to clarify the thermal mixing characteristics of coolant in the core bottom structure of the high-temperature gas-cooled reactor(HTR). The flow field and temperature field in the hot gas chamber and the hot gas duct of the HTR were obtained based on the commercial computational fluid dynamics(CFD) program. The numerical simulation results showed that the helium flow with different temperatures in the hot gas mixing chamber and the hot gas duct mixed intensively, and the mixing rate of the temperature in the outlet of the hot gas duct reached 98 %. The results indicated many large-scale swirling flow structures and strong turbulence in the hot gas mixing chamber and the entrance of the hot gas duct, which were responsible for the excellent thermal mixing of the hot gas chamber and the hot gas duct. The calculated results showed that the temperature mixing rate of the hot gas chamber decreased only marginally with increasing Reynolds number.