An active method for enhancing pump stability, featuring water jet injection at impeller inlet, was applied to a mixed-flow pump. The stall margin, between the design point and the positive slope region of the head-flow characteristic, was most effectively enlarged by injecting the jet in the counter-rotating direction of the impeller. The counter-rotating streamwise vorticity along the casing, generated by the velocity discontinuity due to the jet injection, altered the secondary flow pattern in the impeller by opposing the passage vortex and assisting the tip leakage vortex motion. The location of the wake flow was displaced away from the casing-suction surface corner of the impeller, thus avoiding the onset of the extensive corner separation, the cause of positive slope region of the head-flow characteristic. This method was also confirmed to be effective for stabilizing a pump system already in a state of surge.
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ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition
May 24–27, 1993
Cincinnati, Ohio, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7891-0
PROCEEDINGS PAPER
Suppression of Mixed-Flow Pump Instability and Surge by the Active Alteration of Impeller Secondary Flows
Akira Goto
Akira Goto
Ebara Research Company, Ltd., Fujisawa-shi, Japan
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Akira Goto
Ebara Research Company, Ltd., Fujisawa-shi, Japan
Paper No:
93-GT-298, V03BT16A054; 8 pages
Published Online:
February 25, 2015
Citation
Goto, A. "Suppression of Mixed-Flow Pump Instability and Surge by the Active Alteration of Impeller Secondary Flows." Proceedings of the ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. Volume 3B: General. Cincinnati, Ohio, USA. May 24–27, 1993. V03BT16A054. ASME. https://doi.org/10.1115/93-GT-298
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