CFD investigation for a 7-pin wire-wrapped fuel assembly with different shapes of fuel duct wall

摘要

The wire-wrapped assembly could enhance the safety and the economy of the reactor, however the complex structure brings some new problems for thermal-hydraulic analysis. In this paper, the hydraulic analysis of the 7-pin wire-wrapped assembly is carried out by computational fluid dynamics (CFD). The structural grid of the entire fluid domain is generated by the commercial grid software ICEM CFD and solved by CFX. Unlike most studies, this article explores the effect of assembly fuel flow by changing the shape of the fuel duct. Considering the influence of the different shapes of the fuel duct, the pressure drop, cross flow, sub-channel flow distribution are studied. Through this study, it can help to improve the flow environment of peripheral fuel rods and optimize the design of assembly. (C) 2019 Elsevier Ltd. All rights reserved.