Effects of Starting Time and Impeller Geometry on the Hydraulic Performance of a Centrifugal Pump

摘要

Due to the lack of studies that investigate the transient behavior of centrifugal pumps during starting and stopping periods, this paper provides a numerical study to predict the variation of the dynamic behavior of the flow during the starting period of a centrifugal pump by considering an actual motor torque. The numerical study is based on the characteristic method of specified time intervals taking the pressure head and the flow rate as two dependent variables. After developing the continuity and motion equations, a study based on the pump motor equation was carried out in order to determine the impeller angular velocity variation during the starting time. The numerical obtained results have shown that the pressure increase is more important in the case of a relatively short starting time compared to a long one. These results have shown a good agreement with those obtained by experiment. In this study, the influence of the impeller geometry on the pressure head and flow rate is also investigated. The obtained results have shown a dependency of the pump dynamic behavior with the impeller geometry during the starting periods.