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Open AccessArticle

Numerical Investigation on the Flow Characteristics in a 17 × 17 Full-Scale Fuel Assembly

Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610041, China
Author to whom correspondence should be addressed.
Energies 2020, 13(2), 397;
Received: 29 November 2019 / Revised: 6 January 2020 / Accepted: 10 January 2020 / Published: 13 January 2020
In a previous study, several computational fluid dynamics (CFD) simulations of fuel assembly thermal-hydraulic problems were presented that contained fewer fuel rods, such as 3 × 3 and 5 × 5, due to limited computer capacity. However, a typical AFA-3G fuel assembly consists of 17 × 17 rods. The pressure drop levels and flow details in the whole fuel assembly, and even in the pressurized water reactor (PWR), are not available. Hence, an appropriate CFD method for a full-scale 17 × 17 fuel assembly was the focus of this study. The spacer grids with mixing vanes, springs, and dimples were considered. The polyhedral and extruded mesh was generated using Star-CCM+ software and the total mesh number was about 200 million. The axial and lateral velocity distribution in the sub-channels was investigated. The pressure distribution downstream of different spacer grids were also obtained. As a result, an appropriate method for full-scale rod bundle simulations was obtained. The CFD analysis of thermal-hydraulic problems in a reactor coolant system can be widely conducted by using real-size fuel assembly models.
Keywords: CFD; spacer grid; large-scale fuel assembly; turbulence flow CFD; spacer grid; large-scale fuel assembly; turbulence flow
MDPI and ACS Style

Tian, Z.; Yang, L.; Han, S.; Yuan, X.; Lu, H.; Li, S.; Liu, L. Numerical Investigation on the Flow Characteristics in a 17 × 17 Full-Scale Fuel Assembly. Energies 2020, 13, 397.

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