Aeroacoustics of dual-stream jets with application to turbofan engines.

Detalhes bibliográficos
Autor(a) principal: Odenir de Almeida
Data de Publicação: 2009
Tipo de documento: Tese
Idioma: eng
Título da fonte: Biblioteca Digital de Teses e Dissertações do ITA
Texto Completo: http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=805
Resumo: A Computational Aeroacoustics (CAA) and a novel semi-empirical model is developed for predicting the noise generated by the jet flow through dual stream (coaxial) nozzles, as found in modern turbofan engines. The acoustic source model was developed in a 2D and 3D framework, based on the Lilley's Equations, following the traditional MGBK method from NASA Langley Research Center. The semi-empirical model was based on the Four-Source model from the Institute of Sound and Vibration (ISVR). This suite of methodologies provided a mean of investigating the mechanisms of noise generation and propagation of subsonic coaxial jet flows, as well as the noise prediction at different operating conditions. The work done contributed to the development and improvement of a numerical tool for jet noise prediction of dual-stream exhaust systems, commonly employed in turbofan engines. Such research also subsidies the improvement of semi-empirical methods used in the Center of Reference in Gas Turbine (ITA) for the noise prediction of turbofans in all operating conditions.
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spelling Aeroacoustics of dual-stream jets with application to turbofan engines.AeroacústicaPredição de ruído (aeronaves)Dinâmica dos fluidos computacionalMotores TurbofanTurbinas a gásRuído aerodinâmicoEngenharia mecânicaEngenharia aeronáuticaA Computational Aeroacoustics (CAA) and a novel semi-empirical model is developed for predicting the noise generated by the jet flow through dual stream (coaxial) nozzles, as found in modern turbofan engines. The acoustic source model was developed in a 2D and 3D framework, based on the Lilley's Equations, following the traditional MGBK method from NASA Langley Research Center. The semi-empirical model was based on the Four-Source model from the Institute of Sound and Vibration (ISVR). This suite of methodologies provided a mean of investigating the mechanisms of noise generation and propagation of subsonic coaxial jet flows, as well as the noise prediction at different operating conditions. The work done contributed to the development and improvement of a numerical tool for jet noise prediction of dual-stream exhaust systems, commonly employed in turbofan engines. Such research also subsidies the improvement of semi-empirical methods used in the Center of Reference in Gas Turbine (ITA) for the noise prediction of turbofans in all operating conditions.Instituto Tecnológico de AeronáuticaJoão Roberto BarbosaAristeu da Silveira NetoOdenir de Almeida2009-06-26info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesishttp://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=805reponame:Biblioteca Digital de Teses e Dissertações do ITAinstname:Instituto Tecnológico de Aeronáuticainstacron:ITAenginfo:eu-repo/semantics/openAccessapplication/pdf2019-02-02T14:01:58Zoai:agregador.ibict.br.BDTD_ITA:oai:ita.br:805http://oai.bdtd.ibict.br/requestopendoar:null2020-05-28 19:34:25.534Biblioteca Digital de Teses e Dissertações do ITA - Instituto Tecnológico de Aeronáuticatrue
dc.title.none.fl_str_mv Aeroacoustics of dual-stream jets with application to turbofan engines.
title Aeroacoustics of dual-stream jets with application to turbofan engines.
spellingShingle Aeroacoustics of dual-stream jets with application to turbofan engines.
Odenir de Almeida
Aeroacústica
Predição de ruído (aeronaves)
Dinâmica dos fluidos computacional
Motores Turbofan
Turbinas a gás
Ruído aerodinâmico
Engenharia mecânica
Engenharia aeronáutica
title_short Aeroacoustics of dual-stream jets with application to turbofan engines.
title_full Aeroacoustics of dual-stream jets with application to turbofan engines.
title_fullStr Aeroacoustics of dual-stream jets with application to turbofan engines.
title_full_unstemmed Aeroacoustics of dual-stream jets with application to turbofan engines.
title_sort Aeroacoustics of dual-stream jets with application to turbofan engines.
author Odenir de Almeida
author_facet Odenir de Almeida
author_role author
dc.contributor.none.fl_str_mv João Roberto Barbosa
Aristeu da Silveira Neto
dc.contributor.author.fl_str_mv Odenir de Almeida
dc.subject.por.fl_str_mv Aeroacústica
Predição de ruído (aeronaves)
Dinâmica dos fluidos computacional
Motores Turbofan
Turbinas a gás
Ruído aerodinâmico
Engenharia mecânica
Engenharia aeronáutica
topic Aeroacústica
Predição de ruído (aeronaves)
Dinâmica dos fluidos computacional
Motores Turbofan
Turbinas a gás
Ruído aerodinâmico
Engenharia mecânica
Engenharia aeronáutica
dc.description.none.fl_txt_mv A Computational Aeroacoustics (CAA) and a novel semi-empirical model is developed for predicting the noise generated by the jet flow through dual stream (coaxial) nozzles, as found in modern turbofan engines. The acoustic source model was developed in a 2D and 3D framework, based on the Lilley's Equations, following the traditional MGBK method from NASA Langley Research Center. The semi-empirical model was based on the Four-Source model from the Institute of Sound and Vibration (ISVR). This suite of methodologies provided a mean of investigating the mechanisms of noise generation and propagation of subsonic coaxial jet flows, as well as the noise prediction at different operating conditions. The work done contributed to the development and improvement of a numerical tool for jet noise prediction of dual-stream exhaust systems, commonly employed in turbofan engines. Such research also subsidies the improvement of semi-empirical methods used in the Center of Reference in Gas Turbine (ITA) for the noise prediction of turbofans in all operating conditions.
description A Computational Aeroacoustics (CAA) and a novel semi-empirical model is developed for predicting the noise generated by the jet flow through dual stream (coaxial) nozzles, as found in modern turbofan engines. The acoustic source model was developed in a 2D and 3D framework, based on the Lilley's Equations, following the traditional MGBK method from NASA Langley Research Center. The semi-empirical model was based on the Four-Source model from the Institute of Sound and Vibration (ISVR). This suite of methodologies provided a mean of investigating the mechanisms of noise generation and propagation of subsonic coaxial jet flows, as well as the noise prediction at different operating conditions. The work done contributed to the development and improvement of a numerical tool for jet noise prediction of dual-stream exhaust systems, commonly employed in turbofan engines. Such research also subsidies the improvement of semi-empirical methods used in the Center of Reference in Gas Turbine (ITA) for the noise prediction of turbofans in all operating conditions.
publishDate 2009
dc.date.none.fl_str_mv 2009-06-26
dc.type.driver.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/doctoralThesis
status_str publishedVersion
format doctoralThesis
dc.identifier.uri.fl_str_mv http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=805
url http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=805
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Instituto Tecnológico de Aeronáutica
publisher.none.fl_str_mv Instituto Tecnológico de Aeronáutica
dc.source.none.fl_str_mv reponame:Biblioteca Digital de Teses e Dissertações do ITA
instname:Instituto Tecnológico de Aeronáutica
instacron:ITA
reponame_str Biblioteca Digital de Teses e Dissertações do ITA
collection Biblioteca Digital de Teses e Dissertações do ITA
instname_str Instituto Tecnológico de Aeronáutica
instacron_str ITA
institution ITA
repository.name.fl_str_mv Biblioteca Digital de Teses e Dissertações do ITA - Instituto Tecnológico de Aeronáutica
repository.mail.fl_str_mv
subject_por_txtF_mv Aeroacústica
Predição de ruído (aeronaves)
Dinâmica dos fluidos computacional
Motores Turbofan
Turbinas a gás
Ruído aerodinâmico
Engenharia mecânica
Engenharia aeronáutica
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