Abstract
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.
Original language | English |
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Title of host publication | AIAA SCITECH 2022 Forum |
Number of pages | 11 |
ISBN (Electronic) | 978-1-62410-631-6 |
DOIs | |
Publication status | Published - 2022 |
Event | AIAA SCITECH 2022 Forum - virtual event Duration: 3 Jan 2022 → 7 Jan 2022 |
Publication series
Name | AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022 |
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Conference
Conference | AIAA SCITECH 2022 Forum |
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Period | 3/01/22 → 7/01/22 |
Bibliographical note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-careOtherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.