Two‑parameter dynamical scaling analysis of single‑phase natural circulation in a simple rectangular loop based on dilation transformation  

作　　者：Jia‑Ning Xu Xiang‑Bin Li Yu‑Sheng Liu Shuai Yang De‑Chen Zhang Qiao Wu 

机构地区：[1]School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China [2]Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy,Beijing 102206,China [3]Nuclear and Radiation Safety Center,MEE,Beijing 100082,China [4]Department of Nuclear Engineering,Oregon State University,Corvallis,OR 97331,USA

出　　处：《Nuclear Science and Techniques》2022年第12期59-74,共16页核技术（英文）

摘　　要：Scaling analysis is widely used to design scaled-down experimental facilities through which the prototype phenomena can be effectively evaluated.As a new method,dynamic system scaling(DSS)must be verified as a rational and applicable method.A DSS method based on dilation transformation was evaluated using single-phase natural circulation in a simple rectangular loop.The scaled-down cases were constructed based on two parameters—length ratio and dilation number—and the corresponding transient processes were simulated using the Relap5 computational code.The results show that this DSS method can simulate the dynamic flow characteristics of scaled-down cases.The transient deviation of the temperature difference and mass flow rate of the scaled cases decrease with increases in the length ratio and dilation number.The distortion of the transient temperature difference is smaller than that of the mass flow;however,the overall deviation is within a reasonable range.

关 键 词：Dynamical system scaling analysis Single-phase natural circulation Transient scaling deviation Dilation transformation 

分 类 号：TM623[电气工程—电力系统及自动化]