Blade-Wake Interaction Noise for Turbines With Downwind Rotors

G. M. McNerney; C. P. van Dam; D. T. Yen-Nakafuji

doi:10.1115/1.1627830

Journal of Solar Energy Engineering | Volume 125 | Issue 4 | TECHNICAL PAPERS

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TECHNICAL PAPERS

Blade-Wake Interaction Noise for Turbines With Downwind Rotors

G. M. McNerney, C. P. van Dam and D. T. Yen-Nakafuji

[+] 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

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Figures

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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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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Effect of surface roughness on drag coefficient of circular cylinder 3.

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Effect of freestream turbulence on fluctuating lift coefficient, c_l^′, 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 c_l^′, 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 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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McNerney GM, van Dam CP, Yen-Nakafuji DT. Blade-Wake Interaction Noise for Turbines With Downwind Rotors. ASME. J. Sol. Energy Eng. 2003;125(4):497-505. doi:10.1115/1.1627830.

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Blade-Wake Interaction Noise for Turbines With Downwind Rotors

References

Figures

Flow regimes for smooth circular cylinder at high Reynolds numbers 3.

Time-averaged surface pressure distributions for circular cylinder at medium and high Reynolds numbers 2.

Strouhal number for smooth circular cylinder at medium and high Reynolds numbers 5.

Effect of surface roughness on drag coefficient of circular cylinder 3.

Effect of freestream turbulence on fluctuating lift coefficient, c_l^′, of a circular cylinder 10.

Spanwise correlation length for circular cylinder at smooth and turbulent flow conditions 9.

Effect of cylinder aspect ratio on c_l^′, for a range of Reynolds numbers 14.

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.

Sound radiated from a cylinder of 0.5-inch diameter in wind tunnel 17.

POC acoustic measurement layout.

Exterior/Interior low-frequency acoustic transfer function.

POC field measurement results.

POC interior annoyance SPL level (weighted by ISO C plus exterior/interior transfer for impulsive noise) as a function of tip speed.

Tables

Errata

Discussions

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Journals

Conference Proceedings

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Blade-Wake Interaction Noise for Turbines With Downwind Rotors

References

Figures

Flow regimes for smooth circular cylinder at high Reynolds numbers 3.

Time-averaged surface pressure distributions for circular cylinder at medium and high Reynolds numbers 2.

Strouhal number for smooth circular cylinder at medium and high Reynolds numbers 5.

Effect of surface roughness on drag coefficient of circular cylinder 3.

Effect of freestream turbulence on fluctuating lift coefficient, cl′, of a circular cylinder 10.

Spanwise correlation length for circular cylinder at smooth and turbulent flow conditions 9.

Effect of cylinder aspect ratio on cl′, for a range of Reynolds numbers 14.

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.

Sound radiated from a cylinder of 0.5-inch diameter in wind tunnel 17.

POC acoustic measurement layout.

Exterior/Interior low-frequency acoustic transfer function.

POC field measurement results.

POC interior annoyance SPL level (weighted by ISO C plus exterior/interior transfer for impulsive noise) as a function of tip speed.

Tables

Errata

Discussions

Related Content

Journals

Conference Proceedings

eBooks

Effect of freestream turbulence on fluctuating lift coefficient, c_l^′, of a circular cylinder 10.

Effect of cylinder aspect ratio on c_l^′, for a range of Reynolds numbers 14.