Internal Flow Structure and Hydraulic Loss of Closed-Type Centrifugal Pumps with a Single Blade

抄録

In the present study, we surveyed the performance of closed-type centrifugal pump with a single blade and its fluctuations through an experiment and a CFD analysis, and comparatively verified the blade outlet flow, with the objective of elucidating the internal flow structure and loss generation mechanism of the pump. Furthermore, we quantitatively evaluated each hydraulic loss on the pump and examined the relationship with the vortex structure in an impeller. The result showed that fluctuations in the impeller loss were notable at any flow rate with the maximum value at a blade phase angle of 133° when the best efficiency point flow rate. It suggests an impact of the vortex generated on the shroud side near the end of the blade outlet winding. While the impeller loss indicates similar behavior to the best efficiency point flow rate at a high flow rate, but its fluctuation was extremely large, and we found that such fluctuations are the behavior at a low flow rate was opposite to other flow rates.