Dynamics of the large-scale structures and associated noise emission in airfoil slats
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1017/jfm.2019.496 http://hdl.handle.net/11449/184588 |
Resumo: | We investigate the slat narrowband peak noise generating mechanism. Unsteady flow data were generated by a lattice-Boltzmann-based commercial code for four configurations, accounting for variations of the airfoil angle of attack and slat overlap. Comparison with experimental results indicates that the aspects of the flow field relevant for the generation of the narrowband peaks were accurately captured. Frequency-domain proper orthogonal decomposition (POD) is applied to identify dominant large-scale structures in the frequency range dominated by the peaks. The combined use of the two POD metrics, namely, the turbulent kinetic energy in the turbulent flow region and the acoustic pressure in the far field, demonstrated that the structures most correlated with the noise resemble spanwise coherent Kelvin-Helmholtz vortices which dominate the slat cove only at the frequency of the narrowband peaks. Time evolution of the structures educed using the acoustic pressure correlation provides detailed evidence of the hydrodynamic and acoustic steps of a Rossiter-like feedback mechanism between the slat cusp and trailing edge. The combined analysis of results for the different slat configurations provides an explanation for the effect of the slat configuration on the amplitude of the narrowband peaks observed in previous studies, particularly the influence of the main-element suction peak. |
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Repositório Institucional da UNESP |
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Dynamics of the large-scale structures and associated noise emission in airfoil slatsaeroacousticshydrodynamic noiselow-dimensional modelsWe investigate the slat narrowband peak noise generating mechanism. Unsteady flow data were generated by a lattice-Boltzmann-based commercial code for four configurations, accounting for variations of the airfoil angle of attack and slat overlap. Comparison with experimental results indicates that the aspects of the flow field relevant for the generation of the narrowband peaks were accurately captured. Frequency-domain proper orthogonal decomposition (POD) is applied to identify dominant large-scale structures in the frequency range dominated by the peaks. The combined use of the two POD metrics, namely, the turbulent kinetic energy in the turbulent flow region and the acoustic pressure in the far field, demonstrated that the structures most correlated with the noise resemble spanwise coherent Kelvin-Helmholtz vortices which dominate the slat cove only at the frequency of the narrowband peaks. Time evolution of the structures educed using the acoustic pressure correlation provides detailed evidence of the hydrodynamic and acoustic steps of a Rossiter-like feedback mechanism between the slat cusp and trailing edge. The combined analysis of results for the different slat configurations provides an explanation for the effect of the slat configuration on the amplitude of the narrowband peaks observed in previous studies, particularly the influence of the main-element suction peak.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Marie Curie Grant (FP7-PEOPLE-IRSES: ICOMASEF, Instability and COntrol of MAssively SEparated Flows)Univ Fed Sao Joao del Rei, Dept Thermal & Fluid Sci, Praca Frei Orlando, Praca Frei Orlando 170, Sao Joao Del Rei, BrazilUPM, Sch Aeronaut, ETSIAE, Plaza Cardenal Cisneros 3, E-28040 Madrid, SpainUniv Sao Paulo, Dept Aeronaut Engn, Av Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP, BrazilUNESP Sao Paulo State Univ, Campus Sao Joao Boa Vista, BR-13876750 Sao Joao Da Boa Vista, SP, BrazilUniv Fed Fluminense, Mech Engn Dept, BR-24210240 Niteroi, RJ, BrazilUPM, ETSIAE, Madrid, SpainUNESP Sao Paulo State Univ, Campus Sao Joao Boa Vista, BR-13876750 Sao Joao Da Boa Vista, SP, BrazilCAPES: DS00011/07-0CNPq: 304243/2013-2CNPq: 304859/2016-8CNPq: 405144/2016-4CNPq: 305512/2016-1FAPERJ: E-26/010.000356/2017FAPERJ: E-26/200.003/2018FAPESP: 2016/02970-5FAPESP: 2018/02542-9FAPESP: 2006/52568-7Marie Curie Grant (FP7-PEOPLE-IRSES: ICOMASEF, Instability and COntrol of MAssively SEparated Flows): PIRSES-GA-2009-247651Cambridge Univ PressUniv Fed Sao Joao del ReiUPMUniversidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Universidade Federal Fluminense (UFF)Souza, Daniel S. [UNESP]Rodriguez, DanielHimeno, Fernando H. T.Medeiros, Marcello A. F.2019-10-04T12:14:54Z2019-10-04T12:14:54Z2019-09-25info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1004-1034http://dx.doi.org/10.1017/jfm.2019.496Journal Of Fluid Mechanics. New York: Cambridge Univ Press, v. 875, p. 1004-1034, 2019.0022-1120http://hdl.handle.net/11449/18458810.1017/jfm.2019.496WOS:000477623100001Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal Of Fluid Mechanicsinfo:eu-repo/semantics/openAccess2021-10-23T15:55:12Zoai:repositorio.unesp.br:11449/184588Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T15:55:12Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Dynamics of the large-scale structures and associated noise emission in airfoil slats |
title |
Dynamics of the large-scale structures and associated noise emission in airfoil slats |
spellingShingle |
Dynamics of the large-scale structures and associated noise emission in airfoil slats Souza, Daniel S. [UNESP] aeroacoustics hydrodynamic noise low-dimensional models |
title_short |
Dynamics of the large-scale structures and associated noise emission in airfoil slats |
title_full |
Dynamics of the large-scale structures and associated noise emission in airfoil slats |
title_fullStr |
Dynamics of the large-scale structures and associated noise emission in airfoil slats |
title_full_unstemmed |
Dynamics of the large-scale structures and associated noise emission in airfoil slats |
title_sort |
Dynamics of the large-scale structures and associated noise emission in airfoil slats |
author |
Souza, Daniel S. [UNESP] |
author_facet |
Souza, Daniel S. [UNESP] Rodriguez, Daniel Himeno, Fernando H. T. Medeiros, Marcello A. F. |
author_role |
author |
author2 |
Rodriguez, Daniel Himeno, Fernando H. T. Medeiros, Marcello A. F. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Univ Fed Sao Joao del Rei UPM Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) Universidade Federal Fluminense (UFF) |
dc.contributor.author.fl_str_mv |
Souza, Daniel S. [UNESP] Rodriguez, Daniel Himeno, Fernando H. T. Medeiros, Marcello A. F. |
dc.subject.por.fl_str_mv |
aeroacoustics hydrodynamic noise low-dimensional models |
topic |
aeroacoustics hydrodynamic noise low-dimensional models |
description |
We investigate the slat narrowband peak noise generating mechanism. Unsteady flow data were generated by a lattice-Boltzmann-based commercial code for four configurations, accounting for variations of the airfoil angle of attack and slat overlap. Comparison with experimental results indicates that the aspects of the flow field relevant for the generation of the narrowband peaks were accurately captured. Frequency-domain proper orthogonal decomposition (POD) is applied to identify dominant large-scale structures in the frequency range dominated by the peaks. The combined use of the two POD metrics, namely, the turbulent kinetic energy in the turbulent flow region and the acoustic pressure in the far field, demonstrated that the structures most correlated with the noise resemble spanwise coherent Kelvin-Helmholtz vortices which dominate the slat cove only at the frequency of the narrowband peaks. Time evolution of the structures educed using the acoustic pressure correlation provides detailed evidence of the hydrodynamic and acoustic steps of a Rossiter-like feedback mechanism between the slat cusp and trailing edge. The combined analysis of results for the different slat configurations provides an explanation for the effect of the slat configuration on the amplitude of the narrowband peaks observed in previous studies, particularly the influence of the main-element suction peak. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-04T12:14:54Z 2019-10-04T12:14:54Z 2019-09-25 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1017/jfm.2019.496 Journal Of Fluid Mechanics. New York: Cambridge Univ Press, v. 875, p. 1004-1034, 2019. 0022-1120 http://hdl.handle.net/11449/184588 10.1017/jfm.2019.496 WOS:000477623100001 |
url |
http://dx.doi.org/10.1017/jfm.2019.496 http://hdl.handle.net/11449/184588 |
identifier_str_mv |
Journal Of Fluid Mechanics. New York: Cambridge Univ Press, v. 875, p. 1004-1034, 2019. 0022-1120 10.1017/jfm.2019.496 WOS:000477623100001 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal Of Fluid Mechanics |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
1004-1034 |
dc.publisher.none.fl_str_mv |
Cambridge Univ Press |
publisher.none.fl_str_mv |
Cambridge Univ Press |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1803046942577524736 |