Open Flume Turbine Intake Geometry

by Charles E. Sweeney, Engineering Hydraulics Inc, Redmond, WA, USA,
Gary K. Fain, Engineering Hydraulics Inc, Redmond, WA, USA,

Abstract: An inexpensive physical hydraulic model was used to investigate the geometry of two different open flume turbine intakes. One intake utilized an inverted, fabricated pump bell type of inlet elevated above the powerhouse intake floor. The other consisted of an annular concrete ogee curb resting on the floor. Both intakes were subject to approach flow related performance problems, including free-surface and submerged vortex formation and localized areas of non-radial inflow. These conditions might result in vibration, rough running, and reduced efficiency of the turbines. Corrective measures were developed on the model, including flow directing curtain walls and flow straightening grids. The resulting designs are presented in a generalized non-dimensional form so they may be applied to other similar facilities. A discussion of the limitations on their application is also included.

Subject Headings: Water intakes | Hydraulic models | Turbines | Flumes | Flow measurement | Geometrics | Floors | Fluid flow

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