Blade-Wake Interaction Noise for Turbines With Downwind Rotors

[+] Author and Article Information
G. M. McNerney

The Wind Turbine Company, 1261 120th Ave. NE, Bellevue, WA 98005e-mail: gmcnwind@comcast.net

C. P. van Dam

Department of Mechanical and Aeronautical Engineering, University of California, Davis, Davis, CA 95616-5294e-mail: cpvandam@ucdavis.edu

D. T. Yen-Nakafuji

Renewable Wind Energy, California Energy Commission, 1516 9th Street, MS 43, Sacramento, CA 95814-5504e-mail: dyen@energy.state.ca.us

J. Sol. Energy Eng 125(4), 497-505 (Nov 26, 2003) (9 pages) doi:10.1115/1.1627830 History: Received February 27, 2003; Revised June 02, 2003; Online November 26, 2003
Copyright © 2003 by ASME
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Effect of freestream turbulence on fluctuating lift coefficient, cl, of a circular cylinder 10.
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Spanwise correlation length for circular cylinder at smooth and turbulent flow conditions 9.
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Effect of cylinder aspect ratio on cl, for a range of Reynolds numbers 14.
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Vortex suppression devices: (a) helical strake, (b) spoiler plates, (c) perforated shroud, (d) slatted shroud, (e) splitter plate, (f ) streamlined fairing, (g) guiding vane 16.
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Sound radiated from a cylinder of 0.5-inch diameter in wind tunnel 17.
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Lines of equal sound intensity level for sound due to fluctuating lift and drag radiated from a cylinder of diameter D in a uniform flow of velocity U. (a) Microphone outside test section at an angle 90° from freestream direction, U=225 ft/s. (b) Microphone upstream of the cylinder in tunnel settling chamber at an angle 0° from freestream direction, U=140 ft/s.
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POC acoustic measurement layout.
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Exterior/Interior low-frequency acoustic transfer function.
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POC field measurement results.
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POC interior annoyance SPL level (weighted by ISO C plus exterior/interior transfer for impulsive noise) as a function of tip speed.
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Strouhal number for smooth circular cylinder at medium and high Reynolds numbers 5.
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Power spectra of the lift fluctuations (A is cylinder planform area=L⋅D,q is the freestream dynamic pressure, Φ(f ) is the power spectrum of the lift fluctuations as a function of frequency). (a) Subcritical Re=1.3×105, (b) Supercritical Re=7.2×105, (c) Transition from supercritical to transcritical Re=3.7×106, (d) Transcritical Re=7.1×106. Note, dotted spikes in the spectra are thought to be caused by tunnel vibration 5.
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Flow regimes for smooth circular cylinder at high Reynolds numbers 3.
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Time-averaged surface pressure distributions for circular cylinder at medium and high Reynolds numbers 2.
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Effect of surface roughness on drag coefficient of circular cylinder 3.




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