Abstract
A numerical simulation was carried out in order to investigate the effects of Reynolds number on performance in centrifugal compressor stage. The simulation results show that total-to-total pressure ratio, efficiency decrease 0.18% and 4.3% respectively as the Reynolds number drops. The separation flow under low Reynolds number is more severe. The interaction in impeller among blade surface secondary flow, main tip leakage flows from main blade and splitter blade transfers more circumferentially, leading to higher value and larger region area of entropy. The flow inhomogeneity along the blade height is enhanced at diffuser inlet, and the interaction between the passage wake from impeller and the separation flow from pressure surface secondary flow leads to the high entropy region grows larger and forms the backflow at the rear part of the blade pressure side. The effect of Reynolds number mainly focused on tip leakage flow and passage wake in impeller and wake in vaned diffuser.
Published Version
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