Detecting the Twin Vortex Draft Tube Surge

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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:

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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