Detecting the Twin Vortex Draft Tube Surgeby 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
Abstract: 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: Hydraulic models | Model tests | Turbines | Vortices | Scale models | Hydraulic pressure | Power plants | Dynamic pressure
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