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Noise measurements of NACA 0012, NACA 0021 and flat plate airfoils are obtained at a Reynolds number of 96,000, at angles of attack ranging from −30° to 30°. As the airfoils enter a separated flow regime the strength of the dipolar noise due to shed vorticity increases. This noise source grows in strength over a much smaller range of angles as the thickness of the airfoils is increased, causing the...
Wind farms have recently been reported to produce a noise signature that is described as possessing a “thumping” quality. Measurements of these signatures are limited and their effects are debated but their effect on public opinion and complaints make them a concern for researchers in this field. Proposed reasons for these noise signatures include amplitude modulation, interference patterns and wake–rotor...
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