Abstract
The objective of this paper is to investigate the characteristics of irreversible energy loss caused by cavitation flow in centrifugal pump. The entropy production theory with computational fluid dynamics (CFD) is employed to analyze the relationship between flow field details of cavitation flow and irreversible flow loss. The accuracy of the simulations is ascertained by comparing the cavitation performance curve and cavity distribution of the pump obtained numerically and experimentally. The predicted results show that the entropy production is consistent with the energy loss, and the energy loss in the impeller is large. Further, the distribution of entropy production and flow details in the impeller are analyzed. It is found that the serious cavitation flow changes the flow field structure and the distribution area of maximum entropy production, the turbulence velocity fluctuation is the main reason for the increase of the total entropy production, and the high-speed vortex has great influence on the irreversible flow loss.
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