Skip to content

Publications

Tonal noise from trailing edge serrations at low Reynolds numbers

Tonal noise from trailing edge serrations at low Reynolds numbers

Danielle J. Moreau and Con J. Doolan (2013)

Proceedings of the 19th AIAA/CEAS Aeroacoustics Conference, Berlin, Germany, 27-29 May
DOI: 10.2514/6.2013-2010

Abstract:

The flow and noise created by trailing edge serrations has been studied experimentally, at low Reynolds number (Rec = 1e5 - 1.3e5, based on chord). Wide trailing edge serrations with a wavelength (s) to amplitude (2h) ratio of s/h = 0.6 were found to reduce the overall sound pressure level by up to 11 dB. In contrast, narrower trailing edge serrations with s/h = 0.2 produce high amplitude tonal noise and an increase in the overall sound pressure level of up to 4 dB. Unsteady flow data in near the trailing edge wake show that the narrow serrations are responsible for the formation of intense vortices across the span and this results in the production of high amplitude tonal noise. Wide serrations reduce turbulent velocity fluctuations at low frequencies which explains the lower radiated noise.

This material is now only available to staff and students of the University of Adelaide.
Should you wish to receive a copy, please contact the AVC Group webmaster.
Note that if this article is under review, then it cannot be released and email requests will not be answered.

Published Document - NOT available for public access
Manuscript - available for public access

 

Acoustics Vibration and Control Research Group
Address

THE UNIVERSITY OF ADELAIDE
SA 5005 AUSTRALIA

Contact

T: +61 8 8313 5460
F: +61 8 8313 4367
email