Detecting the Twin Vortex Draft Tube Surge

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

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


Experiments were performed to investigate a twin vortex draft tube surge in a homologous model and the prototype 700-MW turbines installed at the U.S. Bureau of Reclamation's Grand Coulee Third Powerplant. Model tests were conducted on a 1:40.3 scale model turbine located in the new Turbine Research Facility at Colorado State University. Two pressure transducers were mounted 180° apart at the throat of the model draft tube, and pressure fluctuation data were collected with a dynamic signal analyzer and oscilloscope. A BASIC language computer program recorded the operating status of the model turbine. Recent tests have confirmed the presence of the twin vortex in the prototype.

Subject Headings: Vortices | Hydraulic models | Turbines | Scale models | Power plants | Hydraulic pressure | Hydraulic transients | Hydro power

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