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A thorough experimental investigation on airfoil turbulence interaction noise

L. Bowen Orcid Logo, Alper Celik Orcid Logo, M. Azarpeyvand Orcid Logo

Physics of Fluids, Volume: 35, Issue: 3, Start page: 035123

Swansea University Author: Alper Celik Orcid Logo

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DOI (Published version): 10.1063/5.0142704

Abstract

This paper on airfoil turbulence interaction noise reveals the nature of the relation between the distortion type of turbulent structures and radiated far-field noise. The turbulence interaction phenomenon is explored through comprehensive simultaneous hot-wire, surface pressure, and far-field noise...

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Published in: Physics of Fluids
ISSN: 1070-6631 1089-7666
Published: AIP Publishing 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa62786
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first_indexed 2023-03-17T11:39:29Z
last_indexed 2023-04-04T03:25:47Z
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spelling v2 62786 2023-03-04 A thorough experimental investigation on airfoil turbulence interaction noise 3cb1f558a4b194101105e9c1e8d59cbf 0000-0002-2492-4625 Alper Celik Alper Celik true false 2023-03-04 AERO This paper on airfoil turbulence interaction noise reveals the nature of the relation between the distortion type of turbulent structures and radiated far-field noise. The turbulence interaction phenomenon is explored through comprehensive simultaneous hot-wire, surface pressure, and far-field noise measurements. Two grid turbulence cases are utilized to examine the effect of the coherent structure's length scale compared to the airfoil's leading-edge radius. The results show that the turbulent structures with a size comparable to the leading-edge radius disperse into smaller three-dimensional structures, losing their spatial coherence in the vicinity of the stagnation point. In contrast, the structures with larger integral length scales distort into highly coherent two-dimensional structures, yielding an increase in the surface pressure fluctuation energy spectra and the chordwise extent of the affected area by the interaction phenomenon, which is found to be responsible for the increased levels of far-field noise. The turbulence characteristics of the flow far upstream of the stagnation point determine the unsteady loading behavior at the stagnation point yet have little influence on the unsteady loading of the full airfoil chord. The stagnation point velocity fluctuations manifest a strong link to the remainder of the airfoil chord, as well as the near-field hydrodynamic to far-field acoustic signal coherence, while demonstrating no communication with the surface pressure fluctuations at the stagnation point. Journal Article Physics of Fluids 35 3 035123 AIP Publishing 1070-6631 1089-7666 1 3 2023 2023-03-01 10.1063/5.0142704 http://dx.doi.org/10.1063/5.0142704 COLLEGE NANME Aerospace Engineering COLLEGE CODE AERO Swansea University Embraer S.A. and an Engineering and Physical Sciences Research Council doctoral training partnership (EPSRC DTP). EPSRC via Grant No. EP/ S013024/1. 2023-04-20T16:17:59.6265582 2023-03-04T11:53:21.7015483 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering L. Bowen 0000-0001-7513-428x 1 Alper Celik 0000-0002-2492-4625 2 M. Azarpeyvand 0000-0001-7826-7635 3 62786__26879__1f4f3eb5f0d848efa4ad1115b29f6709.pdf 62786.pdf 2023-03-17T11:39:27.8456621 Output 11219060 application/pdf Version of Record true © 2023 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 A thorough experimental investigation on airfoil turbulence interaction noise
spellingShingle A thorough experimental investigation on airfoil turbulence interaction noise
Alper Celik
title_short A thorough experimental investigation on airfoil turbulence interaction noise
title_full A thorough experimental investigation on airfoil turbulence interaction noise
title_fullStr A thorough experimental investigation on airfoil turbulence interaction noise
title_full_unstemmed A thorough experimental investigation on airfoil turbulence interaction noise
title_sort A thorough experimental investigation on airfoil turbulence interaction noise
author_id_str_mv 3cb1f558a4b194101105e9c1e8d59cbf
author_id_fullname_str_mv 3cb1f558a4b194101105e9c1e8d59cbf_***_Alper Celik
author Alper Celik
author2 L. Bowen
Alper Celik
M. Azarpeyvand
format Journal article
container_title Physics of Fluids
container_volume 35
container_issue 3
container_start_page 035123
publishDate 2023
institution Swansea University
issn 1070-6631
1089-7666
doi_str_mv 10.1063/5.0142704
publisher AIP Publishing
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
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
url http://dx.doi.org/10.1063/5.0142704
document_store_str 1
active_str 0
description This paper on airfoil turbulence interaction noise reveals the nature of the relation between the distortion type of turbulent structures and radiated far-field noise. The turbulence interaction phenomenon is explored through comprehensive simultaneous hot-wire, surface pressure, and far-field noise measurements. Two grid turbulence cases are utilized to examine the effect of the coherent structure's length scale compared to the airfoil's leading-edge radius. The results show that the turbulent structures with a size comparable to the leading-edge radius disperse into smaller three-dimensional structures, losing their spatial coherence in the vicinity of the stagnation point. In contrast, the structures with larger integral length scales distort into highly coherent two-dimensional structures, yielding an increase in the surface pressure fluctuation energy spectra and the chordwise extent of the affected area by the interaction phenomenon, which is found to be responsible for the increased levels of far-field noise. The turbulence characteristics of the flow far upstream of the stagnation point determine the unsteady loading behavior at the stagnation point yet have little influence on the unsteady loading of the full airfoil chord. The stagnation point velocity fluctuations manifest a strong link to the remainder of the airfoil chord, as well as the near-field hydrodynamic to far-field acoustic signal coherence, while demonstrating no communication with the surface pressure fluctuations at the stagnation point.
published_date 2023-03-01T16:17:57Z
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score 11.016593

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