Abstract
The fuel rods of the fast reactor are radially and axially fixed and supported by wrapped-wire. The wrapped-wire not only prevents the fuel rod from vibrating but also stirs the coolant, thereby enhancing heat transfer. This paper uses the SST k–ω turbulence model and commercial CFD software to investigate the effect of the number of the wrapped-wires on flow field. The results show that under normal operating conditions, the increase of the number of wrapped wires will increase the pressure difference, but it is conducive to the mixing of the flow field due to the regular eddy current phenomena caused by uneven pressure distribution, which is one of the reasons that affect the convective heat transfer of fuel assemblies.
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