Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.6/12204 |
Resumo: | Laser-Doppler measurements of velocity characteristics of the flowfield resulting from the collision of a wall jet with a boundary layer are presented and discussed together with visualization of the flow. The experiments have been carried out for boundary layer to wall jet velocity ratios of 0.5 and 0.58. Direct photography, digital film imaging, and mean and turbulent laser Doppler measurements were obtained to characterize this type of flows. For the present conditions the results revealed the existence of a small counter-rotating recirculating zone located upstream the separation point not yet reported before for this type of flows. The results show that this secondary vortex has a similar oscillating behavior observed in some configurations leading to ground vortex flows, where they are also probably present, but due the geometric and characteristic parameters could not be identified separately. A particular ordered sequence was recognized for the small recirculation zone, and can be confirmed by the bimodal histogram of the horizontal velocity measurements obtained. In spite of the apparent organized sequence of the turbulent structure of the collision zone, the power spectra measurements did not exhibit any evident particular peaks. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Experimental Study of Instabilities and Secondary Effects of a Ground Vortex FlowVortex FlowNormal StrainVisualization of FlowHistogramsShear LayersWind TunnelsAerodynamic InstabilityJet FlowTurbulence IntensityFlow CharacteristicsLaser-Doppler measurements of velocity characteristics of the flowfield resulting from the collision of a wall jet with a boundary layer are presented and discussed together with visualization of the flow. The experiments have been carried out for boundary layer to wall jet velocity ratios of 0.5 and 0.58. Direct photography, digital film imaging, and mean and turbulent laser Doppler measurements were obtained to characterize this type of flows. For the present conditions the results revealed the existence of a small counter-rotating recirculating zone located upstream the separation point not yet reported before for this type of flows. The results show that this secondary vortex has a similar oscillating behavior observed in some configurations leading to ground vortex flows, where they are also probably present, but due the geometric and characteristic parameters could not be identified separately. A particular ordered sequence was recognized for the small recirculation zone, and can be confirmed by the bimodal histogram of the horizontal velocity measurements obtained. In spite of the apparent organized sequence of the turbulent structure of the collision zone, the power spectra measurements did not exhibit any evident particular peaks.Fundação para a Ciência e a TecnologiaAmerican Institute of Aeronautics and Astronautics IncuBibliorumBarata, Jorge M MRibeiro, Samuel Dinis GalvãoSantos, PedroSilva, AndréSilvestre, M.A.R.2012-06-152060-06-19T00:00:00Z2012-06-15T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.6/12204engBarata, J.M.M., Ribeiro, S., Santos, P., Silva, A.R.R., Silvestre, M.A. Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow 46th AIAA Aerospace Sciences Meeting and Exhibit, Reno, Nevada, EUA, 7-10 janeiro, 2008 DOI: 10.2514/6.2008-343978-1-62410-128-110.2514/6.2008-343info:eu-repo/semantics/embargoedAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-12-15T09:55:15Zoai:ubibliorum.ubi.pt:10400.6/12204Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:51:51.938362Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow |
title |
Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow |
spellingShingle |
Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow Barata, Jorge M M Vortex Flow Normal Strain Visualization of Flow Histograms Shear Layers Wind Tunnels Aerodynamic Instability Jet Flow Turbulence Intensity Flow Characteristics |
title_short |
Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow |
title_full |
Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow |
title_fullStr |
Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow |
title_full_unstemmed |
Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow |
title_sort |
Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow |
author |
Barata, Jorge M M |
author_facet |
Barata, Jorge M M Ribeiro, Samuel Dinis Galvão Santos, Pedro Silva, André Silvestre, M.A.R. |
author_role |
author |
author2 |
Ribeiro, Samuel Dinis Galvão Santos, Pedro Silva, André Silvestre, M.A.R. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
uBibliorum |
dc.contributor.author.fl_str_mv |
Barata, Jorge M M Ribeiro, Samuel Dinis Galvão Santos, Pedro Silva, André Silvestre, M.A.R. |
dc.subject.por.fl_str_mv |
Vortex Flow Normal Strain Visualization of Flow Histograms Shear Layers Wind Tunnels Aerodynamic Instability Jet Flow Turbulence Intensity Flow Characteristics |
topic |
Vortex Flow Normal Strain Visualization of Flow Histograms Shear Layers Wind Tunnels Aerodynamic Instability Jet Flow Turbulence Intensity Flow Characteristics |
description |
Laser-Doppler measurements of velocity characteristics of the flowfield resulting from the collision of a wall jet with a boundary layer are presented and discussed together with visualization of the flow. The experiments have been carried out for boundary layer to wall jet velocity ratios of 0.5 and 0.58. Direct photography, digital film imaging, and mean and turbulent laser Doppler measurements were obtained to characterize this type of flows. For the present conditions the results revealed the existence of a small counter-rotating recirculating zone located upstream the separation point not yet reported before for this type of flows. The results show that this secondary vortex has a similar oscillating behavior observed in some configurations leading to ground vortex flows, where they are also probably present, but due the geometric and characteristic parameters could not be identified separately. A particular ordered sequence was recognized for the small recirculation zone, and can be confirmed by the bimodal histogram of the horizontal velocity measurements obtained. In spite of the apparent organized sequence of the turbulent structure of the collision zone, the power spectra measurements did not exhibit any evident particular peaks. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-06-15 2012-06-15T00:00:00Z 2060-06-19T00:00:00Z |
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://hdl.handle.net/10400.6/12204 |
url |
http://hdl.handle.net/10400.6/12204 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Barata, J.M.M., Ribeiro, S., Santos, P., Silva, A.R.R., Silvestre, M.A. Experimental Study of Instabilities and Secondary Effects of a Ground Vortex Flow 46th AIAA Aerospace Sciences Meeting and Exhibit, Reno, Nevada, EUA, 7-10 janeiro, 2008 DOI: 10.2514/6.2008-343 978-1-62410-128-1 10.2514/6.2008-343 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/embargoedAccess |
eu_rights_str_mv |
embargoedAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
American Institute of Aeronautics and Astronautics Inc |
publisher.none.fl_str_mv |
American Institute of Aeronautics and Astronautics Inc |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799136407205183488 |