Abstract
To investigate the effect of fuel assembly bowing on coolant flow and heat transfer, three-dimensional thermal–hydraulic characteristics of 5×5 bowing fuel assembly are investigated using CFD simulation. The effects of different bowing sizes (1 mm and 2 mm) on the coolant thermal–hydraulic characteristics under three patterns of bowing shapes (C-shape, S-shape, and W-shape) of fuel assembly are revealed. The results show that in case 6 bowing of the fuel assembly reduces the average coolant outlet temperature by 0.37 k. Compared with normal conditions, the pressure, velocity, and temperature of the corner channel and the side channel are more affected by bowing than the middle channel. The research has reference value for fuel assembly design.
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