Horizontal Axis Wind Turbine Aerodynamics: Three-Dimensional, Unsteady, and Separated Flow Influences

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Surface pressure data from the National Renewable Energy Laboratory's ''Unsteady Aerodynamics Experiment'' were analyzed to characterize the impact of three-dimensionality, unsteadiness, and flow separation effects observed to occur on downwind horizontal axis wind turbines (HAWT). Surface pressure and strain gage data were collected from two rectangular planform blades with S809 airfoil cross-sections, one flat and one twisted. Both blades were characterized by the maximum leading edge suction pressure and by the azimuth, velocity, and yaw at which it occurred. The occurrence of dynamic stall at all but the inboard station (30% span) shows good quantitative agreement with the theoretical limits ... continued below

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Robinson, M. C.; Hand, M. M.; Simms, D. A. & Schreck, S. J. April 5, 1999.

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Surface pressure data from the National Renewable Energy Laboratory's ''Unsteady Aerodynamics Experiment'' were analyzed to characterize the impact of three-dimensionality, unsteadiness, and flow separation effects observed to occur on downwind horizontal axis wind turbines (HAWT). Surface pressure and strain gage data were collected from two rectangular planform blades with S809 airfoil cross-sections, one flat and one twisted. Both blades were characterized by the maximum leading edge suction pressure and by the azimuth, velocity, and yaw at which it occurred. The occurrence of dynamic stall at all but the inboard station (30% span) shows good quantitative agreement with the theoretical limits on inflow velocity and yaw that should yield dynamic stall events. A full three-dimensional characterization of the surface pressure topographies combined with flow visualization data from surface mounted tufts offer key insights into the three-dimensional processes involved in the unsteady separation process and may help to explain the discrepancies observed with force measurements at 30% span. The results suggest that quasi-static separation and dynamic stall analysis methods relying on purely two-dimensional flow characterizations may not be capable of simulating the complex three-dimensional flows observed with these data.

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  • Presented at the 3rd ASME/JSME Joint Fluids Engineering Conference, San Francisco, CA (US), 07/18/1999--07/23/1999

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  • Other: DE00007095
  • Report No.: NREL/CP-500-26337
  • Grant Number: AC36-99GO10337
  • Office of Scientific & Technical Information Report Number: 7095
  • Archival Resource Key: ark:/67531/metadc703801

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  • April 5, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 29, 2016, 7:38 p.m.

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Robinson, M. C.; Hand, M. M.; Simms, D. A. & Schreck, S. J. Horizontal Axis Wind Turbine Aerodynamics: Three-Dimensional, Unsteady, and Separated Flow Influences, article, April 5, 1999; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc703801/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.