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Influence of self-oscillating trailing edge flaplets on turbulent boundary layer - Trailing edge noise

Talboys, E. ORCID: 0000-0001-8993-0180, Geyer, T. F. & Brücker, C. ORCID: 0000-0001-5834-3020 (2019). Influence of self-oscillating trailing edge flaplets on turbulent boundary layer - Trailing edge noise. In: Ochmann, M., Vorländer, M. & Fels, J. (Eds.), Proceedings of the 23rd International Congress on Acoustics : integrating 4th EAA Euroregio 2019 : 9-13 September 2019 in Aachen, Germany. (pp. 588-595). Berlin: Deutsche Gesellschaft für Akustik. doi: 10.18154/RWTH-CONV-239824


The aeroacoustics of a tripped NACA0012 aerofoil with an array of self-oscillating flexible flaplets attached to the trailing edge at low to moderate Reynolds number and at geometric angles of attack ag = 0? - 20? is investigated. A low frequency noise reduction occurs at a chord based Strouhal number of 2 - 3 across all Reynolds number and angles of attack. With maximum reductions reaching up to 8 dB within the Strouhal number range. This reduction is proposed to be due to a modification of the instabilities in the shear layer by the self-oscillating flaplets. A slight increase in noise level is seen at higher frequencies, however once the overall sound pressure level is calculated there is still a net overall reduction.

Publication Type: Book Section
Additional Information: © 2019 Proceedings of the International Congress on Acoustics. All rights reserved. 23rd International Congress on Acoustics, ICA 2019, Aachen, Germany, 9 Sep 2019 - 13 Sep 2019; 4th EAA Euroregio, Aachen, Germany, 9 Sep 2019 - 13 Sep 2019, Berlin, Germany : Deutsche Gesellschaft für Akustik.
Publisher Keywords: Passive oscillators, aeroacoustics, trailing edge flaplets, fluid structure interaction
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Departments: School of Science & Technology > Engineering
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