Abstract
A theoretical and experimental study has been made on the transient radial hydrodynamic forces on a diffuser pump impeller during its rapid acceleration from standstill to final speed. Instantaneous radial hydrodynamic forces, suction pressure, discharge pressure and flow rate were measured for various start-up schemes. Theoretical calculations were developed for the prediction of transient radial hydrodynamic forces and compared with the corresponding experimental results. As the results of this study, it becomes clear that the impulsive pressure and the lag in circulation formation around impeller vanes play predominant roles for the difference between transient and quasi-steady hydrodynamic forces of the diffuser pump during its starting period.
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