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Aeration of a Submerged Jet-Flow Gate

by K. Warren Frizell, U.S. Bureau of Reclamation, Denver, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Submerged operation of a jet-flow gate requires special treatment of the area downstream from the gate to avoid cavitation damage. The Bureau of Reclamation studied operation of a submerged jet-flow gate in a 1:21 scale hydraulic model of the Seminoe Dam outlet works. A 60-inch (1524-mm) jet-flow gate discharges into an 84-inch (2134-mm) diameter discharge tube (1.4D expansion). Due to the inability to provide a larger diameter expansion, aeration of the discharge tube by an air vent downstream from the gate was studied. Four different locations for the air vent were tested. Discharge characteristics, pressures in the discharge tube, and air demands were measured for each of the locations. A design curve relating air demand, gate opening, and a submergence parameter was developed.

Subject Headings: Jets (fluid) | Gates (hydraulic) | Water discharge | Hydraulic models | Aeration | Ventilation | Hydraulic design

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