Abstract
The multi-stage centrifugal pump run instability at the original design point, and the running operating point deviated far from the design point during the run. In order to better meet the multi-stage centrifugal pump operational requirements, through hydraulic model modification, changing the multi-stage pump design point, while the performance curve before and after the modification can be interchangeable in the flow of 150m3/h~320m3/h. The original program used 3 blades impeller. Taking into account the matching problem with pressurized water chamber, modification plan used 5 blades impeller. Analysis on the internal flow field before and after the modification was made. Through comparison the internal and external characteristics of the two plans, the analysis found that in the double volute pressurized water chamber, the flow field symmetry of 5 blades is better than the 3 blades’. The flow field symmetry can be well balanced radial force, and help to improve the instability phenomenon in operation.
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