Flow Losses Analysis of Highly-Loaded Centrifugal Impeller Based on Entropy Generation Theory
Highly-loaded centrifugal impellers are widely applied in small aviation engines.It's crucial to understand the internal flow loss characteristics in an impeller to improve the performance of a centrifugal compressor.In the paper,the entropy generation theory was adopted to analyze the loss source and distribution in a highly-loaded centrifugal impeller.The results indicate that,the entropy generation caused by the turbulent viscous dissipation is the main component of total entropy generation.The blade tip leakage and flow separation are the main sources of flow loss in the impeller.As the mass flow rate and rotational speed increase,the flow separation gradually intensifies and the total entropy production increases,but the proportions of entropy production from each source basically remain the same.When the mass flow rate increases,the intensity of tip leakage flow increases.And the separated flow on the suction surface of the splitter blade approaches towards the blade tip direction.As the speed increases,the influence scope of tip leakage flow expands.The separation position on the splitter blade migrates towards the blade root upstream.
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