Slat Noise from an MD30P30N Airfoil at Extreme Angles of Attack
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.2514/1.J056113 http://hdl.handle.net/11449/160139 |
Resumo: | This study investigates the slat noise of a two-dimensional scaled, unswept, and untapered MD30P30N high-lift model. The experimental data refer to aeroacoustic and aerodynamic measurements in a closed-section wind tunnel for a wide range of angles of attack (from -6 deg up to the stall; approximately at 18 deg) and Mach numbers between 0.07 and 0.1. Three slat configurations (the original MD30P30N, another with a higher slat deflection, and one with smaller slat gap and overlap) are studied experimentally. The signal processing applied to the acoustic data involves conventional beamforming enhanced by two deconvolution algorithms, namely, DAMAS and CLEAN-SC. An original variation of the beamforming cluster approach that is based on the coherence level among microphone pairs is introduced, and it improves the results obtained by DAMAS. Below -2 deg and above 12 deg angles of attack, the slat noise is very small and mostly below the wind-tunnel background noise for all configurations. Between -2 and 12 deg angles of attack, the slat noise spectra are substantially affected by the slat configuration, although it always contains a dominant low-frequency content, a midfrequency broadband noise, and a single high-frequency broad peak. Within this range, the lower angles of attack display the strongest low-frequency narrowband peaks. In fact, at lower angles of attack, the low-frequency narrowband peaks scale with a Mach power above 10. |
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spelling |
Slat Noise from an MD30P30N Airfoil at Extreme Angles of AttackThis study investigates the slat noise of a two-dimensional scaled, unswept, and untapered MD30P30N high-lift model. The experimental data refer to aeroacoustic and aerodynamic measurements in a closed-section wind tunnel for a wide range of angles of attack (from -6 deg up to the stall; approximately at 18 deg) and Mach numbers between 0.07 and 0.1. Three slat configurations (the original MD30P30N, another with a higher slat deflection, and one with smaller slat gap and overlap) are studied experimentally. The signal processing applied to the acoustic data involves conventional beamforming enhanced by two deconvolution algorithms, namely, DAMAS and CLEAN-SC. An original variation of the beamforming cluster approach that is based on the coherence level among microphone pairs is introduced, and it improves the results obtained by DAMAS. Below -2 deg and above 12 deg angles of attack, the slat noise is very small and mostly below the wind-tunnel background noise for all configurations. Between -2 and 12 deg angles of attack, the slat noise spectra are substantially affected by the slat configuration, although it always contains a dominant low-frequency content, a midfrequency broadband noise, and a single high-frequency broad peak. Within this range, the lower angles of attack display the strongest low-frequency narrowband peaks. In fact, at lower angles of attack, the low-frequency narrowband peaks scale with a Mach power above 10.Coordination for the Improvement of Higher Education PersonnelFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Sao Paulo, Dept Mech Engn, BR-13566590 Sao Carlos, SP, BrazilSao Paulo State Univ, BR-13876750 Sao Joao Da Boa Vista, BrazilUniv Sao Paulo, Dept Aeronaut Engn, BR-13566590 Sao Carlos, SP, BrazilSao Paulo State Univ, BR-13876750 Sao Joao Da Boa Vista, BrazilCoordination for the Improvement of Higher Education Personnel: DS00011/07-0FAPESP: 2016/02970-5FAPESP: 2006/52568-7CNPq: 141755/2012-1CNPq: 304243/2013-2Amer Inst Aeronautics AstronauticsUniversidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Amaral, Filipe Ramos doTadashi Himeno, Fernando HenriquePagani, Carlos do Carmo [UNESP]Faraco de Medeiros, Marcello Augusto2018-11-26T15:47:37Z2018-11-26T15:47:37Z2018-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article964-978application/pdfhttp://dx.doi.org/10.2514/1.J056113Aiaa Journal. Reston: Amer Inst Aeronautics Astronautics, v. 56, n. 3, p. 964-978, 2018.0001-1452http://hdl.handle.net/11449/16013910.2514/1.J056113WOS:000426601300006WOS000426601300006.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengAiaa Journal0,763info:eu-repo/semantics/openAccess2023-11-24T06:17:35Zoai:repositorio.unesp.br:11449/160139Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:38:34.004209Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Slat Noise from an MD30P30N Airfoil at Extreme Angles of Attack |
title |
Slat Noise from an MD30P30N Airfoil at Extreme Angles of Attack |
spellingShingle |
Slat Noise from an MD30P30N Airfoil at Extreme Angles of Attack Amaral, Filipe Ramos do |
title_short |
Slat Noise from an MD30P30N Airfoil at Extreme Angles of Attack |
title_full |
Slat Noise from an MD30P30N Airfoil at Extreme Angles of Attack |
title_fullStr |
Slat Noise from an MD30P30N Airfoil at Extreme Angles of Attack |
title_full_unstemmed |
Slat Noise from an MD30P30N Airfoil at Extreme Angles of Attack |
title_sort |
Slat Noise from an MD30P30N Airfoil at Extreme Angles of Attack |
author |
Amaral, Filipe Ramos do |
author_facet |
Amaral, Filipe Ramos do Tadashi Himeno, Fernando Henrique Pagani, Carlos do Carmo [UNESP] Faraco de Medeiros, Marcello Augusto |
author_role |
author |
author2 |
Tadashi Himeno, Fernando Henrique Pagani, Carlos do Carmo [UNESP] Faraco de Medeiros, Marcello Augusto |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Amaral, Filipe Ramos do Tadashi Himeno, Fernando Henrique Pagani, Carlos do Carmo [UNESP] Faraco de Medeiros, Marcello Augusto |
description |
This study investigates the slat noise of a two-dimensional scaled, unswept, and untapered MD30P30N high-lift model. The experimental data refer to aeroacoustic and aerodynamic measurements in a closed-section wind tunnel for a wide range of angles of attack (from -6 deg up to the stall; approximately at 18 deg) and Mach numbers between 0.07 and 0.1. Three slat configurations (the original MD30P30N, another with a higher slat deflection, and one with smaller slat gap and overlap) are studied experimentally. The signal processing applied to the acoustic data involves conventional beamforming enhanced by two deconvolution algorithms, namely, DAMAS and CLEAN-SC. An original variation of the beamforming cluster approach that is based on the coherence level among microphone pairs is introduced, and it improves the results obtained by DAMAS. Below -2 deg and above 12 deg angles of attack, the slat noise is very small and mostly below the wind-tunnel background noise for all configurations. Between -2 and 12 deg angles of attack, the slat noise spectra are substantially affected by the slat configuration, although it always contains a dominant low-frequency content, a midfrequency broadband noise, and a single high-frequency broad peak. Within this range, the lower angles of attack display the strongest low-frequency narrowband peaks. In fact, at lower angles of attack, the low-frequency narrowband peaks scale with a Mach power above 10. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-11-26T15:47:37Z 2018-11-26T15:47:37Z 2018-03-01 |
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/10.2514/1.J056113 Aiaa Journal. Reston: Amer Inst Aeronautics Astronautics, v. 56, n. 3, p. 964-978, 2018. 0001-1452 http://hdl.handle.net/11449/160139 10.2514/1.J056113 WOS:000426601300006 WOS000426601300006.pdf |
url |
http://dx.doi.org/10.2514/1.J056113 http://hdl.handle.net/11449/160139 |
identifier_str_mv |
Aiaa Journal. Reston: Amer Inst Aeronautics Astronautics, v. 56, n. 3, p. 964-978, 2018. 0001-1452 10.2514/1.J056113 WOS:000426601300006 WOS000426601300006.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Aiaa Journal 0,763 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
964-978 application/pdf |
dc.publisher.none.fl_str_mv |
Amer Inst Aeronautics Astronautics |
publisher.none.fl_str_mv |
Amer Inst Aeronautics Astronautics |
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_ |
1808128957960159232 |