On the aeroacoustic characterization of a robust trailing-edge serration

Celik, Alper; Mayer, Y. D.; Azarpeyvand, M.

doi:10.1063/5.0054767

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On the aeroacoustic characterization of a robust trailing-edge serration

Alper Celik

, Y. D. Mayer, M. Azarpeyvand

Physics of Fluids, Volume: 33, Issue: 7, Start page: 075120

Swansea University Author: Alper Celik

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DOI (Published version): 10.1063/5.0054767

Abstract

This paper presents an experimental study on the aeroacoustics of a flat plate rig with a highly instrumented serrated trailing-edge. The role of near-field flow properties, namely, surface pressure fluctuations and spanwise coherence, in the noise suppression capability of serration is not properly...

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Published in:	Physics of Fluids
ISSN:	1070-6631 1089-7666
Published:	AIP Publishing 2021
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URI:	https://cronfa.swan.ac.uk/Record/cronfa60235
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first_indexed	2022-06-29T11:58:00Z
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spelling	2022-10-31T20:15:27.5791795 v2 60235 2022-06-14 On the aeroacoustic characterization of a robust trailing-edge serration 3cb1f558a4b194101105e9c1e8d59cbf 0000-0002-2492-4625 Alper Celik Alper Celik true false 2022-06-14 AERO This paper presents an experimental study on the aeroacoustics of a flat plate rig with a highly instrumented serrated trailing-edge. The role of near-field flow properties, namely, surface pressure fluctuations and spanwise coherence, in the noise suppression capability of serration is not properly understood. The results from this test rig aim to provide additional insight into the effects of the serration on the hydrodynamic field (flow field) and the scattering of the pressure waves along the trailing-edge. Despite its unconventional size, beamforming results showed a significant reduction of far-field noise over a broadband frequency range. The associated flow field is characterized by mean and spectral analyses of static and dynamic surface pressure measurements as well as hot-wire measurements. The mean pressure coefficient results and the boundary layer velocity profiles over the serrated trailing-edge showed minute differences compared to the baseline straight trailing-edge. However, the frequency-dependent energy content of the unsteady surface pressure fluctuations demonstrates an elevated energy region around the serration edges at low frequencies. Although there is an increase in the energy content of the low frequency pressure fluctuations on the serrated trailing-edge, a significant phase difference of the pressure waves is observed, which may be indicative of destructive interference. The temporal studies regarding the unsteady surface pressure fluctuations corroborate the presence of quasi-periodic large scale structures emanating from the serration edges. Journal Article Physics of Fluids 33 7 075120 AIP Publishing 1070-6631 1089-7666 23 7 2021 2021-07-23 10.1063/5.0054767 COLLEGE NANME Aerospace Engineering COLLEGE CODE AERO Swansea University The first author would like to acknowledge the financial support of EPSRC (Engineering and Physical Sciences Research Council) via Grant No. EP/S013024/1. The second author would like to acknowledge the financial support through an EPSRC DTP grant. 2022-10-31T20:15:27.5791795 2022-06-14T17:40:03.3233755 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering Alper Celik 0000-0002-2492-4625 1 Y. D. Mayer 2 M. Azarpeyvand 0000-0001-7826-7635 3 60235__24413__ff779e984ede4fb2a3fb31cf032becde.pdf 60235.pdf 2022-06-29T12:58:52.1114193 Output 7044071 application/pdf Version of Record true Copyright: 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license true eng http://creativecommons.org/licenses/by/4.0/
title	On the aeroacoustic characterization of a robust trailing-edge serration
spellingShingle	On the aeroacoustic characterization of a robust trailing-edge serration Alper Celik
title_short	On the aeroacoustic characterization of a robust trailing-edge serration
title_full	On the aeroacoustic characterization of a robust trailing-edge serration
title_fullStr	On the aeroacoustic characterization of a robust trailing-edge serration
title_full_unstemmed	On the aeroacoustic characterization of a robust trailing-edge serration
title_sort	On the aeroacoustic characterization of a robust trailing-edge serration
author_id_str_mv	3cb1f558a4b194101105e9c1e8d59cbf
author_id_fullname_str_mv	3cb1f558a4b194101105e9c1e8d59cbf_***_Alper Celik
author	Alper Celik
author2	Alper Celik Y. D. Mayer M. Azarpeyvand
format	Journal article
container_title	Physics of Fluids
container_volume	33
container_issue	7
container_start_page	075120
publishDate	2021
institution	Swansea University
issn	1070-6631 1089-7666
doi_str_mv	10.1063/5.0054767
publisher	AIP Publishing
college_str	Faculty of Science and Engineering
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hierarchy_parent_title	Faculty of Science and Engineering
department_str	School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering
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description	This paper presents an experimental study on the aeroacoustics of a flat plate rig with a highly instrumented serrated trailing-edge. The role of near-field flow properties, namely, surface pressure fluctuations and spanwise coherence, in the noise suppression capability of serration is not properly understood. The results from this test rig aim to provide additional insight into the effects of the serration on the hydrodynamic field (flow field) and the scattering of the pressure waves along the trailing-edge. Despite its unconventional size, beamforming results showed a significant reduction of far-field noise over a broadband frequency range. The associated flow field is characterized by mean and spectral analyses of static and dynamic surface pressure measurements as well as hot-wire measurements. The mean pressure coefficient results and the boundary layer velocity profiles over the serrated trailing-edge showed minute differences compared to the baseline straight trailing-edge. However, the frequency-dependent energy content of the unsteady surface pressure fluctuations demonstrates an elevated energy region around the serration edges at low frequencies. Although there is an increase in the energy content of the low frequency pressure fluctuations on the serrated trailing-edge, a significant phase difference of the pressure waves is observed, which may be indicative of destructive interference. The temporal studies regarding the unsteady surface pressure fluctuations corroborate the presence of quasi-periodic large scale structures emanating from the serration edges.
published_date	2021-07-23T04:18:10Z
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score	11.016593

On the aeroacoustic characterization of a robust trailing-edge serration

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