CFD Analysis On Enhancement Of Heat Transfer In A Typical AP1000 Sub-channel

Enhancement of heat transfer in sub-channels is one of most important subjects in thermal hydraulics of nuclear reactor.This work to analyze and evaluate the threedimensional turbulent flow and convective heat transfer through spacer grid with and without mixing vane in a single-phase and steady-state in a single sub-channel of AP1000 nuclear reactor core as computational domain by using general computational fluid dynamics(CFD)code,Ansys CFX release 16.Standard k–? model are used as a turbulence closure model,the sub-channel is analyzed by numerical simulation.the CFD results show that the turbulence in the sub-channel was significantly promoted by spacer and mixing devices and affect strongly the heat transfer in the sub-channel,by 11% improvement of the adjacent fuel rod temperature,and give reasonable agreements with experimental data and AP1000 thermal hydraulic design.