Vortex Suppression in Wet-Pit Pump Intakesby Tatsuaki Nakato, Univ of Iowa, Iowa City, United States,
Abstract: Two distinct examples to suppress both air-entraining and boundary-attached subsurface vortices in large vertical pump intakes are presented that were developed by means of hydraulic model tests and verified in prototype situations. The first example employed flow-turning vanes, a horizontal grating, floor and backwall splitters, and floor-corner fillets, and the second, a combination of these and an inverted drafttube layout. In both cases, pump-vibration problems were practically eliminated and net positive suction heads were substantially increased.
Subject Headings: Water intakes | Hydraulic models | Vortices | Floors | Pumping tests | Model tests | Suction | Fluid flow
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