Mixing Preformance Analysis for Advanced Fuel Assembly Grid

Fuel assembly grids of pressurized water reactor strengthen the coolant mixing around fuel rod through mixing structure.The size and shape of mixing vane affects the mixing performance and flow resistance.This paper introduces the process and result of grid mixing performance optimizing design.Using CFD software,three dimensional flow field of three grid design schemes are analyzed and compared.The results show that the mixing performance of scheme 3 is better than that of scheme 1 and 2 in terms of the highest fluid temperature and the most difference in temperature.And mixing performance of scheme 1 and 2 is better than that of scheme 3 in terms of typical channel average temperature.