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RESEARCH PAPERS

Modeling of Aerodynamically Generated Noise From Wind Turbines

[+] Author and Article Information
Wei Jun Zhu

Dept. of Mechanical Engineering, Fluid Mechanics Section, Building 403, Technical University of Denmark, DK-2800 Lyngby, Denmarkwjz@mek.dtu.dk

Nicolai Heilskov, Wen Zhong Shen, Jens Nørkær Sørensen

Dept. of Mechanical Engineering, Fluid Mechanics Section, Building 403, Technical University of Denmark, DK-2800 Lyngby, Denmark

J. Sol. Energy Eng 127(4), 517-528 (Jun 09, 2005) (12 pages) doi:10.1115/1.2035700 History: Received September 10, 2004; Revised June 08, 2005; Accepted June 09, 2005

A semiempirical acoustic generation model based on the work of Brooks, Pope, and Marcolini [NASA Reference Publication 1218 (1989)] has been developed to predict aerodynamic noise from wind turbines. The model consists of dividing the blades of the wind turbine into two-dimensional airfoil sections and predicting the total noise emission as the sum of the contribution from each blade element. Input is the local relative velocities and boundary layer parameters. These quantities are obtained by combining the model with a Blade Element Momentum (BEM) technique to predict local inflow characteristics to the blades. Boundary layer characteristics are determined from two-dimensional computations of airfoils. The model is applied to the Bonus 300 kW wind turbine at a wind speed of 8 m/s. Comparisons of total noise spectra show good agreement with experimental data.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Turbulence intensity in the rotor plane. (b) Turbulence length scale (in meter) in the rotor plane.

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Figure 2

Boundary layer displacement thickness at trailing edge of NACA 0012 and NACA 63418

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Figure 3

Noise spectra of all source mechanisms

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Figure 4

Power curve of the Bonus 300 kW wind turbine (Measurements from Ref. 23)

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Figure 5

Calculated sound power level using NACA 0012 airfoil

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Figure 6

Calculated sound power level using NACA 632×× series airfoil

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Figure 7

Calculated sound power level using NACA 634×× series airfoil

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Figure 8

(a) TE noise together with Separation noise spectra using NACA 632×× series airfoils. (b) TE noise together with Separation noise spectra using NACA 634×× series airfoils

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Figure 9

Total noise computed with different pitch settings

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Figure 10

TE Bluntness - Vortex Shedding noise

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Figure 11

Overall noise level at different rotor speeds

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Figure 12

(a) Overall sound power level with/without wind shear effect. (b) Overall sound power level with/without wind turbine tower effect (one of the blades is aligned with tower).

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Figure 13

Sound pressure level distributions at different circular positions

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Figure 14

Sound pressure level detected at ground level 40 meters downstream for one revolution period

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