Study of the effect of bulb seal on the slat noise using numerical simulation

Detalhes bibliográficos
Autor(a) principal: Himeno, Fernando Henrique Tadashi
Data de Publicação: 2018
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Biblioteca Digital de Teses e Dissertações da USP
Texto Completo: https://www.teses.usp.br/teses/disponiveis/18/18148/tde-14052024-102241/
Resumo: The development on Environmental Regulations related to aircraft noise propagated to the vicinity of airports forced the industry to investigate the noise sources and look for alternatives of noise reduction. The current aircraft noise has a large contribution provenient from the airframe, due to the turbofan engine development. One can identify the most relevant sources as the landing gear, flap and slat. Since slat is distributed in almost whole extension it becomes a distributed noise source. The presence of excrescences inside slat cove can changes significantly the recirculating flow and the characteristics of noise generated. We present simulations with PowerFLOW code for MD30P30N high-lift airfoil, with a square section seal attached on slat cove. Results of propagated noise are presented showing the presence of broadband peaks and the differences caused by the seal inclusion. Mean flow shows the presence of an additional recirculation bubble for some positions of the seal. Propor Orthogonal Decomposition was used to identify the coherent structures that could be related to the slat cavity modes and emerges at earlier stages of mixing layer for cases where the seal presence creates a secondary counter-rotating bubble
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spelling Study of the effect of bulb seal on the slat noise using numerical simulationEstudo do efeito de um selo no ruído do eslate através de simulação numéricaaeroacousticsaeroacústicacove sealeslateLattice-BoltzmannLattice-BoltzmannpowerflowseloslatThe development on Environmental Regulations related to aircraft noise propagated to the vicinity of airports forced the industry to investigate the noise sources and look for alternatives of noise reduction. The current aircraft noise has a large contribution provenient from the airframe, due to the turbofan engine development. One can identify the most relevant sources as the landing gear, flap and slat. Since slat is distributed in almost whole extension it becomes a distributed noise source. The presence of excrescences inside slat cove can changes significantly the recirculating flow and the characteristics of noise generated. We present simulations with PowerFLOW code for MD30P30N high-lift airfoil, with a square section seal attached on slat cove. Results of propagated noise are presented showing the presence of broadband peaks and the differences caused by the seal inclusion. Mean flow shows the presence of an additional recirculation bubble for some positions of the seal. Propor Orthogonal Decomposition was used to identify the coherent structures that could be related to the slat cavity modes and emerges at earlier stages of mixing layer for cases where the seal presence creates a secondary counter-rotating bubbleO desenvolvimeto da Legislação Ambiental relacionada ao ruído de aeronaves nas vizinhanças dos aeroportos impulsionou a indústria à investigar as fontes de ruído e buscar alternativas para sua redução. Atualmente, grande parte do ruído de aeronaves é proveniente das superfícies aerodinâmicas e carenagens devido ao desenvolvimento de turbinas com alta razão de derivação. Pode-se identificar como as principais fontes de ruído: o trem de pouso, flapes e eslates. Como o eslate está distribuído em praticamente toda extensão da asa, esse dispositivo representa uma fonte de ruído distribuída. A presença de excrescências dentro da cova do eslate pode alterar significativamente a recirculação do escoamento dentro da cova e as características de ruído do eslate. Esse trabalho apresenta simulações usando o código PowerFLOW para o aerofólio hiper-sustentador MD30P30N, com um selo presente na cova do eslate. Resultados do ruído propagado são apresentados mostrando a presença de picos de banda larga e diferenças causadas pela inclusão do selo. O escoamento médio mostra a presença de uma bolha de recirculação adicional para algumas posições de selo. O método de Proper Orthogonal Decomposition também é usado para identificar as estruturas coerentes imersas no escoamento que podem estar relacionadas com os modos de cavidade do eslate e surgem em estágios iniciais para os casos que o selo produz uma bolha secundária contra-rotativaBiblioteca Digitais de Teses e Dissertações da USPMedeiros, Marcello Augusto Faraco deHimeno, Fernando Henrique Tadashi2018-04-27info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttps://www.teses.usp.br/teses/disponiveis/18/18148/tde-14052024-102241/reponame:Biblioteca Digital de Teses e Dissertações da USPinstname:Universidade de São Paulo (USP)instacron:USPLiberar o conteúdo para acesso público.info:eu-repo/semantics/openAccesseng2024-05-14T13:53:03Zoai:teses.usp.br:tde-14052024-102241Biblioteca Digital de Teses e Dissertaçõeshttp://www.teses.usp.br/PUBhttp://www.teses.usp.br/cgi-bin/mtd2br.plvirginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.bropendoar:27212024-05-14T13:53:03Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Study of the effect of bulb seal on the slat noise using numerical simulation
Estudo do efeito de um selo no ruído do eslate através de simulação numérica
title Study of the effect of bulb seal on the slat noise using numerical simulation
spellingShingle Study of the effect of bulb seal on the slat noise using numerical simulation
Himeno, Fernando Henrique Tadashi
aeroacoustics
aeroacústica
cove seal
eslate
Lattice-Boltzmann
Lattice-Boltzmann
powerflow
selo
slat
title_short Study of the effect of bulb seal on the slat noise using numerical simulation
title_full Study of the effect of bulb seal on the slat noise using numerical simulation
title_fullStr Study of the effect of bulb seal on the slat noise using numerical simulation
title_full_unstemmed Study of the effect of bulb seal on the slat noise using numerical simulation
title_sort Study of the effect of bulb seal on the slat noise using numerical simulation
author Himeno, Fernando Henrique Tadashi
author_facet Himeno, Fernando Henrique Tadashi
author_role author
dc.contributor.none.fl_str_mv Medeiros, Marcello Augusto Faraco de
dc.contributor.author.fl_str_mv Himeno, Fernando Henrique Tadashi
dc.subject.por.fl_str_mv aeroacoustics
aeroacústica
cove seal
eslate
Lattice-Boltzmann
Lattice-Boltzmann
powerflow
selo
slat
topic aeroacoustics
aeroacústica
cove seal
eslate
Lattice-Boltzmann
Lattice-Boltzmann
powerflow
selo
slat
description The development on Environmental Regulations related to aircraft noise propagated to the vicinity of airports forced the industry to investigate the noise sources and look for alternatives of noise reduction. The current aircraft noise has a large contribution provenient from the airframe, due to the turbofan engine development. One can identify the most relevant sources as the landing gear, flap and slat. Since slat is distributed in almost whole extension it becomes a distributed noise source. The presence of excrescences inside slat cove can changes significantly the recirculating flow and the characteristics of noise generated. We present simulations with PowerFLOW code for MD30P30N high-lift airfoil, with a square section seal attached on slat cove. Results of propagated noise are presented showing the presence of broadband peaks and the differences caused by the seal inclusion. Mean flow shows the presence of an additional recirculation bubble for some positions of the seal. Propor Orthogonal Decomposition was used to identify the coherent structures that could be related to the slat cavity modes and emerges at earlier stages of mixing layer for cases where the seal presence creates a secondary counter-rotating bubble
publishDate 2018
dc.date.none.fl_str_mv 2018-04-27
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://www.teses.usp.br/teses/disponiveis/18/18148/tde-14052024-102241/
url https://www.teses.usp.br/teses/disponiveis/18/18148/tde-14052024-102241/
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv
dc.rights.driver.fl_str_mv Liberar o conteúdo para acesso público.
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Liberar o conteúdo para acesso público.
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.coverage.none.fl_str_mv
dc.publisher.none.fl_str_mv Biblioteca Digitais de Teses e Dissertações da USP
publisher.none.fl_str_mv Biblioteca Digitais de Teses e Dissertações da USP
dc.source.none.fl_str_mv
reponame:Biblioteca Digital de Teses e Dissertações da USP
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Biblioteca Digital de Teses e Dissertações da USP
collection Biblioteca Digital de Teses e Dissertações da USP
repository.name.fl_str_mv Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)
repository.mail.fl_str_mv virginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.br
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