Streamwise fences for the reduction of the trailing-edge noise are experimentally investigated on a NACA633018 airfoil. Interchangeable trailing-edge inserts with streamwise fences of different spacing and height are tested in an anechoic wind tunnel. Far-field trailing-edge noise was measured by an array of microphone and the airfoil drag was calculated from the wake profiles acquired by a wake rake. The transversal spacing between the fences has a much stronger impact on noise reduction than the fences height. A maximum noise reduction of 5-6dB is obtained from fences having a spacing of 2 mm, and it is achieved in the range of Strouhal numbers based on the chord of 15-40, equivalent to frequencies 1-3 kHz. When increasing the spacing between the fences from 2 mm to 4 mm, a different aeroacoustic behavior is observed, with a lower noise reduction at high frequencies, and a higher noise reduction and low frequencies. Increasing the angle of attack from α=0° to α=6° does not lead to any significant deterioration of the noise reduction performance. From a wake survey, the coefficient of drag was found to increase of only 6-7%when installing trailing-edge inserts with fences.
|Title of host publication||AIAA SCITECH 2022 Forum|
|Number of pages||11|
|Publication status||Published - 2022|
|Event||AIAA SCITECH 2022 Forum - virtual event|
Duration: 3 Jan 2022 → 7 Jan 2022
|Name||AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022|
|Conference||AIAA SCITECH 2022 Forum|
|Period||3/01/22 → 7/01/22|
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