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TECHNICAL PAPERS

Boundary Layer State and Flow Field Structure Underlying Rotational Augmentation of Blade Aerodynamic Response

[+] Author and Article Information
S. Schreck, M. Robinson

Applied Research Division, National Renewable Energy Laboratory’s National Wind Technology Center, Golden, CO 80401

J. Sol. Energy Eng 125(4), 448-456 (Nov 26, 2003) (9 pages) doi:10.1115/1.1624087 History: Received January 05, 2003; Revised June 05, 2003; Online November 26, 2003
Copyright © 2003 by ASME
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References

Figures

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NREL Unsteady Aerodynamics Experiment wind turbine in NASA Ames wind tunnel
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Blade cross-section and planform, showing pressure tap locations
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Unsteady Aerodynamics Experiment blade twist distribution
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Definition of local inflow angle (LFA)
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Typical surface pressure distribution means for separation (U=10 m/s,r/R=0.63) and impingement (U=14 m/s,r/R=0.30)
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Typical surface pressure standard deviations for separation (U=10 m/s,r/R=0.63) and impingement (U=14 m/s,r/R=0.30)
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Schematic flow field topologies for boundary layer separation (a) and shear layer impingement (b)
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Separation/impingement chordwise location (a), and mean Cn vs. LFA (b), for 0.30 R
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Separation/impingement chordwise location (a), and mean Cn vs. LFA (b), for 0.47 R
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Separation/impingement chordwise location (a), and mean Cn vs. LFA (b), for 0.63 R
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Separation/impingement chordwise location (a), and mean Cn vs. LFA (b), for 0.80 R
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Separation/impingement contours for incipient rotational augmentation. Open symbols=separation, filled symbols=impingement.
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Separation/impingement contours for advanced rotational augmentation. Open symbols=separation, filled symbols=impingement.
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Separation/impingement contour and surface pressure contours for U=10 m/s superimposed. Leading edge at top of figure.
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Separation/impingement contour and surface pressure contours for U=15 m/s superimposed. Leading edge at top of figure.

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