Energy loss mechanism in inter-stage of multi-stage centrifugal pump with space guide vane
In order to investigate the causes of inter-stage energy loss in a multi-stage centrifugal pump with space guide vane,a single-stage and a three-stage submersible pump were taken as research ob-jects,and the mechanism of inter-stage energy loss was analyzed through a combination of experimental and numerical simulation methods.Full flow field hydraulic characteristic tests were carried out on the single-stage and three-stage submersible pumps,respectively.Based on ANSYS software,numerical simulation and internal flow field analysis were conducted for different flow points of the three-stage submersible pump,with a focus on analyzing and comparing the inlet flow pattern,internal vortex structure,and blade load of each stage of the impeller.The results show that under low flow condi-tions,the heads of each stage of the three-stage submersible pump are close and not significantly diffe-rent from that of the single-stage.Under rated flow conditions and high flow conditions,the first-stage head of the three-stage submersible pump is still not significantly different from that of the single-stage head,but the head of the last two stages is 6％-10％lower than that of the first stage.As the flow rate increases,the stability of the incoming flow from the first-stage impeller is not affected,while the flow state of the incoming flow from the subsequent stages of impellers deteriorates.The change in the angle of attack of the liquid medium at the inlet of the last two stages of the impeller increases its impact on the inlet edge of the blades.When the flow rate is high,the vortices at the inlet of the last two stages of the impellers develop into streamwise vortices,causing a sudden change in blade load which weakens the impeller's functional ability,resulting in energy loss in the last two stages.The research results can provide a theoretical basis for the design of multi-stage centrifugal pumps.
three-stage submersible pumpinter-stage energy lossimpeller inletvortex structureblade load
万方数据
维普
