Dynamic scaling characteristics of single-phase natural circulation based on different strain transformations

Jia-Ning Xu; Xiang-Bin Li; Zhong-Yi Wang; Yu-Sheng Liu; De-Chen Zhang; Qiao Wu

doi:10.1007/s41365-023-01296-y

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Dynamic scaling characteristics of single-phase natural circulation based on different strain transformations

NUCLEAR ENERGY SCIENCE AND ENGINEERING | Updated：2023-10-13

- Dynamic scaling characteristics of single-phase natural circulation based on different strain transformations
- Nuclear Science and Techniques Vol. 34, Issue 9, Article number: 142(2023)
- Affiliations：
  
  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.China Institute of Nuclear Industry Strategy, Beijing, China
  4.Nuclear and Radiation Safety Center, MEE, Beijing 100082, China
  5.Department of Nuclear Engineering, Oregon State University, Corvallis, OR 97331, USA
- Author bio：
  
  * lixiangbin@ncepu.edu.cn
- Funds：
- DOI：10.1007/s41365-023-01296-y
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Jia-Ning Xu, Xiang-Bin Li, Zhong-Yi Wang, et al. Dynamic scaling characteristics of single-phase natural circulation based on different strain transformations. [J]. Nuclear Science and Techniques 34(9):142(2023)
DOI：

Jia-Ning Xu, Xiang-Bin Li, Zhong-Yi Wang, et al. Dynamic scaling characteristics of single-phase natural circulation based on different strain transformations. [J]. Nuclear Science and Techniques 34(9):142(2023) DOI： 10.1007/s41365-023-01296-y.

摘要

Abstract

To understand the dynamical system scaling (DSS) analysis theory, the applicability of DSS β- and ω-strain transformation methods for the scaling analysis of complex loops was explored. A simplified model consisting of two loops was established based on the primary and secondary sides of a nuclear reactor, and β- and ω-strain transformation methods were used to analyze the single-phase natural circulation in the primary circuit. For comparison with the traditional method, simplified DSS β- and ω-strain methods were developed based on the standard scaling criterion. The strain parameters in these four methods were modified to form multiple groups of scaled-down cases. The transient process of the natural circulation was simulated using the Relap5 code, and the variation in the dynamic flow characteristics with the strain numbers was obtained using different scaling methods. The results show that both the simplified and standard DSS methods can simulate the dynamic characteristics of natural circulation in the primary circuit. The scaled-down cases in the simplified method exhibit the same geometric scaling and correspond to small core power ratios. By contrast, different scaled-down cases in the standard DSS method correspond to different geometric scaling criteria and require more power. The dynamic process of natural circulation can be simulated more accurately using the standard DSS method.

关键词

Keywords

Dynamical system scaling analysisβ-strain transformationω-strain transformationNatural circulation

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