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Type: Conference paper
Title: Tonal noise from trailing edge serrations at low Reynolds numbers
Author: Moreau, D.
Doolan, C.
Citation: Proceedings, 19th AIAA/CEAS Aeroacoustics Conference and 34th AIAA Aeroacoustics Conference, 2013 / pp.98-113
Publisher: Curran Associates Inc
Publisher Place: New York
Issue Date: 2013
ISBN: 9781624102134
Conference Name: AIAA/CEAS Aeroacoustics Conference (19th : 2013 : Berlin, Germany)
Statement of
Danielle J. Moreau and Con J. Doolan
Abstract: The flow and noise created by trailing edge serrations has been studied experimentally, at low Reynolds number (Rec = 1×105 - 1.3×105, based on chord). Wide trailing edge serrations with a wavelength () 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.
Rights: Copyright status unknown
Appears in Collections:Aurora harvest
Mechanical Engineering conference papers

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