Wind Turbine Wake Measurements in the Operating Region of a Tail Vain

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In conjunction with the National Renewable Energy Laboratory's (NREL's) Unsteady Aerodynamics Experiment (UAE) at NASA Ames, we measured the wake of an upwind 10-meter (m) diameter wind turbine in the typical region of a tail vane. The experiment was performed in a 24.4-by-36.6-m wind tunnel. We placed two sonic anemometers 0.58 rotor diameters downwind of the rotor at hub height. One was positioned nominally behind the nacelle at 9% radius and the second was placed 2-m outboard at 49% radius. The tunnel wind speed was varied from 5 to 25 meters per second (m/s) and the turbine rotor speed was ... continued below

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Larwood, S. January 22, 2001.

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In conjunction with the National Renewable Energy Laboratory's (NREL's) Unsteady Aerodynamics Experiment (UAE) at NASA Ames, we measured the wake of an upwind 10-meter (m) diameter wind turbine in the typical region of a tail vane. The experiment was performed in a 24.4-by-36.6-m wind tunnel. We placed two sonic anemometers 0.58 rotor diameters downwind of the rotor at hub height. One was positioned nominally behind the nacelle at 9% radius and the second was placed 2-m outboard at 49% radius. The tunnel wind speed was varied from 5 to 25 meters per second (m/s) and the turbine rotor speed was held at 72 revolutions per minute (rpm). We varied yaw from 0{degree} to 60{degree}. The data showed unsteadiness in the wake due to the nacelle wake. Also, the unsteadiness increased with the onset of blade stall. The axial induction factor in the wake showed that the turbine was operating within the windmill brake state of actuator disk momentum theory. Little variation in unsteadiness was shown under yawed conditions. We also discovered that lateral velocity behind the nacelle was negative and would result in an unfurling normal force on a tail vane. The vertical velocity was shown to change sign under yawed conditions, conceivably as a result of the opposing blade root vortex.

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  • 39th American Institute of Aeronautics and Astronautics, Inc. (AIAA) Aerospace Sciences Meeting, Reno, NV (US), 01/08/2001--01/11/2001

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  • Report No.: NREL/CP-500-29132
  • Grant Number: AC36-99GO10337
  • Office of Scientific & Technical Information Report Number: 775911
  • Archival Resource Key: ark:/67531/metadc718245

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  • January 22, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 31, 2016, 8:22 p.m.

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Larwood, S. Wind Turbine Wake Measurements in the Operating Region of a Tail Vain, article, January 22, 2001; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc718245/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.