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TECHNICAL PAPERS

Skewed Wake Induction Effects on Thrust Distribution on Small Wind Turbine Rotors

[+] Author and Article Information
Ken Chaney, Alfred J. Eggers, Patrick J. Moriarty, William E. Holley

RANN, Inc. 744 San Antonio Road, Suite 26, Palo Alto, CA 94303e-mail: ranninc@pacbell.net

J. Sol. Energy Eng 123(4), 290-295 (Jul 01, 2001) (6 pages) doi:10.1115/1.1410109 History: Received March 01, 2001; Revised July 01, 2001
Copyright © 2001 by ASME
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References

Eggers, A. J., Jr., Chaney, K., Holley, W. E., and Ashley, H., 2000, “Modeling of Yawing and Furling Behavior of Small Wind Turbines,” A Collection of the 2000 ASME Wind Energy Symp. Technical Papers Presented at the 38th AIAA Aerospace Sciences Meeting and Exhibit; Reno, NV.
Fingersh, L., Simms, D., Hand, M., Jager, D., Cotrell, J., Robinson, M., Schreck, S., and Larwood, S., 2001, “Wind Tunnel Testing of NREL’s Unsteady Aerodynamics Experiment,” A Collection of the 2001 ASME Wind Energy Symp. Technical Papers Presented at the 39th AIAA Aerospace Sciences Meeting and Exhibit; Reno, NV.
Pitt, D. M., and Peters, D. A., 1980, “Theoretical Predictions of Dynamic-Inflow Derivatives;” Sixth European Rotorcraft and Powered Lift Aircraft Forum, Bristol, England.
Hansen, A. C., 1992, “Yaw Dynamics of Horizontal Axis Wind Turbines, Final Report,” NREL/TP-442-4822.
Hansen, A. C., 1998, “Users Guide to the Wind Turbine Dynamics Computer Programs YawDyn and AeroDyn for ADAMS,” Mech. Eng. Dept., Univ. of Utah.
Coleman, R. P., Heingold, A. M., and Stempin, C. W., 1945, “Evaluation of the Induced-Velocity Field of an Idealized Helicopter Rotor;” NACA ARR No. L5E10.
Durand, W. F., (ed.), 1935, Aerodynamic Theory; Vol. IV, Julius Springer, pp. 180–181.
Joglekar, M., and Loewy, R., 1970, “An Actuator-Disc Analysis of Helicopter Wake Geometry and the Corresponding Blade Response,” USAAVLABS Tech. Report 69–66.
Eggers, A. J., Jr., 1989, “A Study of Rotational Effects on the Partially Stalled Flow About CER Blade Sections,” submitted to SERI.
Schepers, J. G., 1999, “An Engineering Model for Yawed Conditions, Developed on Basis of Wind Tunnel Measurements,” AIAA-99-0039.

Figures

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Predicted induction normal to the fore-aft axis of the Windlite 8kW rotor (skew=0° and TSR=7)
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Predicted induction normal to the fore-aft axis of the Windlite 8kW rotor (skew=30° and TSR=7)
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Predicted angles of attack along the fore-aft axis of the Windlite 8kW rotor (skew=0° and TSR=7)
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Predicted angles of attack along the fore-aft axis of the Windlite 8kW rotor (skew=30° and TSR=7)
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Representation of skewed helical vortices by circular and linear vortices in the wake
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Coordinate system and symbols for an idealized rotor disk and cylindrical wake
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Predicted induction normal to the fore-aft axis of an idealized rotor disk according to the Coleman model (skew=0° with and without inboard stall)
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Predicted induction normal to the fore-aft axis of an idealized rotor disk according to the Coleman model (skew=30° with and without inboard stall)
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Local thrust coefficient distribution for an idealized rotor disk according to the Coleman model (rstall=0.3,skew=60°,au=0.2, and as=0)
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Predicted center of thrust location for an idealized rotor disk over a range of skew angles (rstall=0.3,au=0.2, and as=0)
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Predicted center of thrust location for an idealized rotor disk over a range of skew angles (rstall=0.6,au=0.2, and as=0)
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Predicted cyclic blade root moments for an idealized rotor disk over a range of azimuth angles (skew=60°,au=0.2, and rstall=0.0)
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Predicted cyclic blade root moments for an idealized rotor disk over a range of azimuth angles (skew=60°,au=0.2,as=0, and rstall=0.3)
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Predicted cyclic blade root moments for an idealized rotor disk over a range of azimuth angles (skew=60°,au=0.2,as=0, and rstall=0.6)

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