Aeroacoustic tests of seven airfoils were performed in an open jet anechoic wind tunnel. Six of the airfoils are candidates for use on small wind turbines operating at low Reynolds numbers. One airfoil was tested for comparison to benchmark data. Tests were conducted with and without boundary layer tripping. In some cases, a turbulence grid was placed upstream in the test section to investigate inflow turbulence noise. An array of 48 microphones was used to locate noise sources and separate airfoil noise from extraneous tunnel noise. Trailing-edge noise was dominant for all airfoils in clean tunnel flow. With the boundary layer untripped, several airfoils exhibited pure tones that disappeared after proper tripping was applied. In the presence of inflow turbulence, leading-edge noise was dominant for all airfoils.
Wind Tunnel Aeroacoustic Tests of Six Airfoils for Use on Small Wind Turbines*
Contributed by the Solar Energy Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received by the ASME Solar Division January 26, 2004; final revision June 15, 2004. Associate Editor: J. Davidson.
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Migliore, P., and Oerlemans, S. (November 18, 2004). "Wind Tunnel Aeroacoustic Tests of Six Airfoils for Use on Small Wind Turbines." ASME. J. Sol. Energy Eng. November 2004; 126(4): 974–985. https://doi.org/10.1115/1.1790535
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