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TECHNICAL PAPERS

Tip Speed Ratio Influences on Rotationally Augmented Boundary Layer Topology and Aerodynamic Force Generation

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

Applied Research Division, NREL’s National Wind Technology Center, Golden, CO 80401

J. Sol. Energy Eng. 126(4), 1025-1033 (Nov 18, 2004) (9 pages) doi:10.1115/1.1793209 History: Received February 09, 2004; Revised June 29, 2004; Online November 18, 2004
Copyright © 2004 by ASME
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References

Figures

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NREL UAE 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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LFA pairs chosen to suppress LFA effects and disclose TSR influence
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Cn vs LFA at 0.30R, for βS=2.0° (higher TSR) and 4.0° (lower TSR)
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Cn vs LFA at 0.47R, for βS=2.0° (higher TSR) and 4.0° (lower TSR)
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Cn vs LFA at 0.63R, for βS=2.0° (higher TSR) and 4.0° (lower TSR)
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Blade boundary layer separation (upper) and shear layer impingement (lower)
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Shear layer impingement location (x/c) vs LFA at 0.30R, for βS=2.0° (higher TSR) and βS=4.0° (lower TSR)
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Shear layer impingement location (x/c) vs LFA at 0.47R, for βS=2.0° (higher TSR) and βS=4.0° (lower TSR)
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Shear layer impingement location (x/c) vs LFA at 0.63R, for βS=2.0° (higher TSR) and βS=4.0° (lower TSR)
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Change in shear layer impingement location at 0.30R and 0.63R, due to incremental TSR increase
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Change in shear layer impingement location at 0.47R, due to incremental TSR increase
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Normal force increment vs TSRMN, for 0.30R and 0.63R
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Normal force increment vs TSRMN, for 0.47R

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