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Open AccessArticle

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

1
Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
2
Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China
3
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; https://doi.org/10.3390/en13020397
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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