To analyze the mixing ability of the spacer grid and further optimize the thermal design method of the spacer grid,this article investigates the influence of spacer grid with different structures on the temperature field distribution at the outlet of rod bundle channel through experiments.In the experiments the system pressure is 7.0～16.5 MPa,the mass velocity is 900～4500 kg/m2s,and the temperature difference between the inlet and outlet of the experimental section is 30～128℃.The experimental results show that,within the range of PWR operating parameters,the ratio of the difference between the maximum and minimum temperatures of the sub-channel at the bundle channel outlet section to the temperature difference at the inlet and outlet has no obvious change trend under different thermal parameters such as pressure,inlet and outlet temperature difference and mass flow rate for the same spacer grid structure.The mixing wing dominates the mixing effect of the spacer grid,and Type Ⅱ mixing wing has stronger mixing effect.For the D-type spacer grid,the asymmetric strip structure will lead to a certain deflection of the whole flow field,which will reduce the mixing effect of the spacer grid to some extent.
Spacer gridRod bundle channelTemperature field distribution
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