On closed-section wind-tunnel aeroacoustic experiments with a two-dimensional lifting body
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/10.1016/j.apacoust.2018.12.029 http://hdl.handle.net/11449/187265 |
Resumo: | Slat noise experiments are sometimes performed to provide data for the validation of numerical procedures. Under such circumstances, closed-section wind-tunnels, in contrast with open-section ones, offer well-defined boundary conditions for simulations. Nevertheless, many difficulties arise in aeroacoustic experiments with two-dimensional lifting body tests in such wind-tunnels. Reverberation and acoustic images can also interfere with the measurements. This paper addresses the effects of the aforementioned issues on the MD30P30N airfoil slat aeroacoustic measurements. Conventional beamforming and DAMAS deconvolution techniques were employed for the acoustic data post-processing. Pressure taps were used in the assessment of spanwise and chordwise pressures on the high-lift airfoil model surfaces. The interaction between the airfoil and the wind-tunnel wall boundary-layer was mitigated by the application of suction on the tunnel wall and rendered a more two-dimensional flow. Acoustic polyurethane -based foam was applied on the test-section walls for reducing reverberation effects on the slat noise source maps. The results showed the error in the noise spectrum associated with the three-dimensional effect at the model ends may correspond to a decrement of 4 deg or higher of the entire wing angle of attack. The acoustic treatment over the wind-tunnel closed-section walls mitigated the mirror sources, nevertheless, the effects of such source images on both noise source maps and noise spectra in the region of interest were considered small. |
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spelling |
On closed-section wind-tunnel aeroacoustic experiments with a two-dimensional lifting bodyAcoustic beamformingBoundary-layer suctionClosed-section wind-tunnelsDAMASSlat noiseWall acoustic treatmentSlat noise experiments are sometimes performed to provide data for the validation of numerical procedures. Under such circumstances, closed-section wind-tunnels, in contrast with open-section ones, offer well-defined boundary conditions for simulations. Nevertheless, many difficulties arise in aeroacoustic experiments with two-dimensional lifting body tests in such wind-tunnels. Reverberation and acoustic images can also interfere with the measurements. This paper addresses the effects of the aforementioned issues on the MD30P30N airfoil slat aeroacoustic measurements. Conventional beamforming and DAMAS deconvolution techniques were employed for the acoustic data post-processing. Pressure taps were used in the assessment of spanwise and chordwise pressures on the high-lift airfoil model surfaces. The interaction between the airfoil and the wind-tunnel wall boundary-layer was mitigated by the application of suction on the tunnel wall and rendered a more two-dimensional flow. Acoustic polyurethane -based foam was applied on the test-section walls for reducing reverberation effects on the slat noise source maps. The results showed the error in the noise spectrum associated with the three-dimensional effect at the model ends may correspond to a decrement of 4 deg or higher of the entire wing angle of attack. The acoustic treatment over the wind-tunnel closed-section walls mitigated the mirror sources, nevertheless, the effects of such source images on both noise source maps and noise spectra in the region of interest were considered small.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)University of Sao Paulo (USP) Sao Carlos School of EngineeringSao Paulo State University (UNESP)Federal University of Sao Joao del-Rei (UFSJ)Sao Paulo State University (UNESP)CAPES: #00011/07-0CNPq: #141755/2012-1FAPESP: #2016/02970-5CNPq: #304859/2016-8Universidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Universidade Federal de Sergipe (UFS)Amaral, Filipe Ramos doPagani, Carlos do Carmo [UNESP]Himeno, Fernando Henrique TadashiSouza, Daniel Sampaio [UNESP]Medeiros, Marcello Augusto Faraco de2019-10-06T15:30:50Z2019-10-06T15:30:50Z2019-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article409-422http://dx.doi.org/10.1016/j.apacoust.2018.12.029Applied Acoustics, v. 148, p. 409-422.1872-910X0003-682Xhttp://hdl.handle.net/11449/18726510.1016/j.apacoust.2018.12.0292-s2.0-85059937139Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengApplied Acousticsinfo:eu-repo/semantics/openAccess2021-10-22T18:13:05Zoai:repositorio.unesp.br:11449/187265Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:31:43.948709Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
On closed-section wind-tunnel aeroacoustic experiments with a two-dimensional lifting body |
title |
On closed-section wind-tunnel aeroacoustic experiments with a two-dimensional lifting body |
spellingShingle |
On closed-section wind-tunnel aeroacoustic experiments with a two-dimensional lifting body Amaral, Filipe Ramos do Acoustic beamforming Boundary-layer suction Closed-section wind-tunnels DAMAS Slat noise Wall acoustic treatment |
title_short |
On closed-section wind-tunnel aeroacoustic experiments with a two-dimensional lifting body |
title_full |
On closed-section wind-tunnel aeroacoustic experiments with a two-dimensional lifting body |
title_fullStr |
On closed-section wind-tunnel aeroacoustic experiments with a two-dimensional lifting body |
title_full_unstemmed |
On closed-section wind-tunnel aeroacoustic experiments with a two-dimensional lifting body |
title_sort |
On closed-section wind-tunnel aeroacoustic experiments with a two-dimensional lifting body |
author |
Amaral, Filipe Ramos do |
author_facet |
Amaral, Filipe Ramos do Pagani, Carlos do Carmo [UNESP] Himeno, Fernando Henrique Tadashi Souza, Daniel Sampaio [UNESP] Medeiros, Marcello Augusto Faraco de |
author_role |
author |
author2 |
Pagani, Carlos do Carmo [UNESP] Himeno, Fernando Henrique Tadashi Souza, Daniel Sampaio [UNESP] Medeiros, Marcello Augusto Faraco de |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) Universidade Federal de Sergipe (UFS) |
dc.contributor.author.fl_str_mv |
Amaral, Filipe Ramos do Pagani, Carlos do Carmo [UNESP] Himeno, Fernando Henrique Tadashi Souza, Daniel Sampaio [UNESP] Medeiros, Marcello Augusto Faraco de |
dc.subject.por.fl_str_mv |
Acoustic beamforming Boundary-layer suction Closed-section wind-tunnels DAMAS Slat noise Wall acoustic treatment |
topic |
Acoustic beamforming Boundary-layer suction Closed-section wind-tunnels DAMAS Slat noise Wall acoustic treatment |
description |
Slat noise experiments are sometimes performed to provide data for the validation of numerical procedures. Under such circumstances, closed-section wind-tunnels, in contrast with open-section ones, offer well-defined boundary conditions for simulations. Nevertheless, many difficulties arise in aeroacoustic experiments with two-dimensional lifting body tests in such wind-tunnels. Reverberation and acoustic images can also interfere with the measurements. This paper addresses the effects of the aforementioned issues on the MD30P30N airfoil slat aeroacoustic measurements. Conventional beamforming and DAMAS deconvolution techniques were employed for the acoustic data post-processing. Pressure taps were used in the assessment of spanwise and chordwise pressures on the high-lift airfoil model surfaces. The interaction between the airfoil and the wind-tunnel wall boundary-layer was mitigated by the application of suction on the tunnel wall and rendered a more two-dimensional flow. Acoustic polyurethane -based foam was applied on the test-section walls for reducing reverberation effects on the slat noise source maps. The results showed the error in the noise spectrum associated with the three-dimensional effect at the model ends may correspond to a decrement of 4 deg or higher of the entire wing angle of attack. The acoustic treatment over the wind-tunnel closed-section walls mitigated the mirror sources, nevertheless, the effects of such source images on both noise source maps and noise spectra in the region of interest were considered small. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-06T15:30:50Z 2019-10-06T15:30:50Z 2019-05-01 |
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/10.1016/j.apacoust.2018.12.029 Applied Acoustics, v. 148, p. 409-422. 1872-910X 0003-682X http://hdl.handle.net/11449/187265 10.1016/j.apacoust.2018.12.029 2-s2.0-85059937139 |
url |
http://dx.doi.org/10.1016/j.apacoust.2018.12.029 http://hdl.handle.net/11449/187265 |
identifier_str_mv |
Applied Acoustics, v. 148, p. 409-422. 1872-910X 0003-682X 10.1016/j.apacoust.2018.12.029 2-s2.0-85059937139 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Applied Acoustics |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
409-422 |
dc.source.none.fl_str_mv |
Scopus 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_ |
1808129331163037696 |