Mapping 2-D and 3-D Velocity Components in Circular Conduits Using an Electromagnetic Current Meter and a 5-Hole Pilot Probe

by Joseph J. Orlins, ENSR Consulting and Engineering, Redmond, United States,
Lawrence J. Swenson, ENSR Consulting and Engineering, Redmond, United States,

Document Type: Proceeding Paper

Part of: Fundamentals and Advancements in Hydraulic Measurements and Experimentation


The techniques presented in this paper facilitate the visualization of the two-dimensional and three-dimensional flow fields at arbitrary sections in a conduit. They have been used to evaluate both model and full-scale fish screening designs. Velocity measurements were made in laboratory-scale and full-scale hydroelectric penstocks using a two-component electromagnetic current meter and a three-component five-hole pitot probe. The axial and tangential velocity components at a circular section normal to a pipe axis, and the three-dimensional velocity components at an elliptical section inclined with respect to the pipe centerline were measured. Data processing was accomplished using a combination of custom personal-computer based data acquisition programs and spreadsheet templates. Isovel and vector plots were created using commercially available software packages.

Subject Headings: Conduits | Flow visualization | Two-dimensional flow | Fluid velocity | Three-dimensional flow | Flow measurement | Data collection

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