Wind Tunnel Aeroacoustic Tests of Six Airfoils for Use on Small Wind Turbines: Preprint

Research output: Contribution to conferencePaper


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 number. 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 investigateinflow 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 noisewas dominant for all airfoils.
Original languageAmerican English
Number of pages18
StatePublished - 2003
Event2004 AIAA Wind Energy Symposium - Reno, Nevada
Duration: 5 Jan 20048 Jan 2004


Conference2004 AIAA Wind Energy Symposium
CityReno, Nevada

Bibliographical note

Prepared for the 2004 AIAA Wind Energy Symposium, 5-8 January 2004, Reno, Nevada

NREL Publication Number

  • NREL/CP-500-35090


  • aeroacoustic tests
  • airfoils
  • small wind turbines


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