クローズド形一枚羽根遠心ポンプの変動流体力に関する研究

概要

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Single-blade centrifugal impellers widely used as sewage pumps are geometrically asymmetric. Therefore, circumferential static pressure distribution of an impeller changes considerably with its rotation, and is considered to drastically change radial and axial thrust. Therefore, to improve pump reliability, it is necessary to quantitatively understand unsteady hydrodynamic force and elucidate the behavior and mechanism of the thrust generated. This study investigates the radial and axial thrust acting on a single-blade centrifugal impeller by conducting experiments and CFD analysis. As a result, the behavior of the radial and axial thrust of the hydrodynamic force acting on rear shroud and front shroud surfaces was clarified. The axial thrust of the hydraulic part is the lowest, and those of the rear shroud and front shroud are dominant compared with their radial thrust. Increase in the axial thrust of the shrouds is due to the increase in the leakage flow rate with the increase in the circumferential static pressure distribution of the impeller.