In the fast reactor, flow fields which have different temperature flow out of heads of assemblies and then mix intensely, which leads to temperature fluctuation. The temperature fluctuation in the fast reactor is very serious due to the thermal characteristic, especially in the upper plenum, which may cause thermal fatigue in the structure of fast reactor. In the published work, simplified parallel jet models were used to investigate the temperature fluctuation, which can not fully reflect the characteristic of temperature fluctuation in the upper plenum of fast reactor. This paper made a more realistic model that includes three heads of assemblies and part of the central column to do further study both numerically and experimentally. The experimental setup was designed and manufactured. The temperature at different heights was obtained while cool and hot fluid mixed in the setup. Meanwhile the same experimental conditions were simulated with Large Eddy Simulation(LES) turbulence model.
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|Affiliation/Organization||North China Electric Power University|