Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow
Autor(a) principal: | |
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Data de Publicação: | 2013 |
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/10400.6/12179 |
Resumo: | An experimental and numerical study is carried out to investigate the flowfield created by twin impinging jets aligned with a low velocity crossflow. The mean velocity, velocity fluctuation and visualization in the impingement region were obtained for a Reynolds number based on the jet exit conditions of Rej=4.3x104, an impingement height of 20.1 diameter and for a velocity ratios between the jet exit and the crossflow VR=Vj/Uo of 22.5, 33.7 and 43.8 with interject spacing, S of 6D. The experimental results show a large penetration of the first (upstream) impinging jet, giving rise to a ground vortex due to the collision of the radial wall jet and the crossflow that wraps around the impinging point like a scarf. The second jet (located downstream) it is not so affected by the crossflow in terms of deflection, but it does not reach the ground due to the downstream wall jet that flows radially from the impinging point of the first jet along the ground. The results indicate a new flow pattern not yet reported so far, in which a VSTOL aircraft operating in ground vicinity with front wind or small forward movement may result in enhanced negative pressures in the underside of the aircraft causing a pitching moment and a suction down force towards the ground. To extend the experimental results, the flow was also numerically simulated using a Reynolds Averaged Navier-Stokes formulation with the "k-ε" turbulence model. |
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Numerical and Experimental Study of Two Impinging Jets in a Row through a CrossflowHorseshoe VortexPitching MomentReynolds Averaged Navier StokesFlow PatternsNormal StressFlow CharacteristicsTurbulence ModelsShear LayersWind TunnelsNumerical SimulationAn experimental and numerical study is carried out to investigate the flowfield created by twin impinging jets aligned with a low velocity crossflow. The mean velocity, velocity fluctuation and visualization in the impingement region were obtained for a Reynolds number based on the jet exit conditions of Rej=4.3x104, an impingement height of 20.1 diameter and for a velocity ratios between the jet exit and the crossflow VR=Vj/Uo of 22.5, 33.7 and 43.8 with interject spacing, S of 6D. The experimental results show a large penetration of the first (upstream) impinging jet, giving rise to a ground vortex due to the collision of the radial wall jet and the crossflow that wraps around the impinging point like a scarf. The second jet (located downstream) it is not so affected by the crossflow in terms of deflection, but it does not reach the ground due to the downstream wall jet that flows radially from the impinging point of the first jet along the ground. The results indicate a new flow pattern not yet reported so far, in which a VSTOL aircraft operating in ground vicinity with front wind or small forward movement may result in enhanced negative pressures in the underside of the aircraft causing a pitching moment and a suction down force towards the ground. To extend the experimental results, the flow was also numerically simulated using a Reynolds Averaged Navier-Stokes formulation with the "k-ε" turbulence model.Fundação para a Ciência e a TecnologiaAmerican Institute of Aeronautics and Astronautics IncuBibliorumVieira, DianaSilva, AndréNeves, Fernando M. S. P.Carvalho, Pedro dos Santos DuarteBarata, Jorge M M2013-01-052060-01-05T00:00:00Z2013-01-05T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.6/12179engVieira, D.F.C., Silva, A.R.R., Neves, F.M.S.P., Carvalho, P.S.D., Barata, J.M.M. Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow 51th Aerospace Sciences Meeting, Grapevine (Dallas/Ft. Worth Region), Texas, EUA, 7-10 janeiro, 2013 DOI: 10.2514/6.2013-806978-162410181-610.2514/6.2013-806info: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:RCAAP2023-12-15T09:55:10Zoai:ubibliorum.ubi.pt:10400.6/12179Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:51:50.644887Repositório 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 |
Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow |
title |
Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow |
spellingShingle |
Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow Vieira, Diana Horseshoe Vortex Pitching Moment Reynolds Averaged Navier Stokes Flow Patterns Normal Stress Flow Characteristics Turbulence Models Shear Layers Wind Tunnels Numerical Simulation |
title_short |
Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow |
title_full |
Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow |
title_fullStr |
Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow |
title_full_unstemmed |
Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow |
title_sort |
Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow |
author |
Vieira, Diana |
author_facet |
Vieira, Diana Silva, André Neves, Fernando M. S. P. Carvalho, Pedro dos Santos Duarte Barata, Jorge M M |
author_role |
author |
author2 |
Silva, André Neves, Fernando M. S. P. Carvalho, Pedro dos Santos Duarte Barata, Jorge M M |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
uBibliorum |
dc.contributor.author.fl_str_mv |
Vieira, Diana Silva, André Neves, Fernando M. S. P. Carvalho, Pedro dos Santos Duarte Barata, Jorge M M |
dc.subject.por.fl_str_mv |
Horseshoe Vortex Pitching Moment Reynolds Averaged Navier Stokes Flow Patterns Normal Stress Flow Characteristics Turbulence Models Shear Layers Wind Tunnels Numerical Simulation |
topic |
Horseshoe Vortex Pitching Moment Reynolds Averaged Navier Stokes Flow Patterns Normal Stress Flow Characteristics Turbulence Models Shear Layers Wind Tunnels Numerical Simulation |
description |
An experimental and numerical study is carried out to investigate the flowfield created by twin impinging jets aligned with a low velocity crossflow. The mean velocity, velocity fluctuation and visualization in the impingement region were obtained for a Reynolds number based on the jet exit conditions of Rej=4.3x104, an impingement height of 20.1 diameter and for a velocity ratios between the jet exit and the crossflow VR=Vj/Uo of 22.5, 33.7 and 43.8 with interject spacing, S of 6D. The experimental results show a large penetration of the first (upstream) impinging jet, giving rise to a ground vortex due to the collision of the radial wall jet and the crossflow that wraps around the impinging point like a scarf. The second jet (located downstream) it is not so affected by the crossflow in terms of deflection, but it does not reach the ground due to the downstream wall jet that flows radially from the impinging point of the first jet along the ground. The results indicate a new flow pattern not yet reported so far, in which a VSTOL aircraft operating in ground vicinity with front wind or small forward movement may result in enhanced negative pressures in the underside of the aircraft causing a pitching moment and a suction down force towards the ground. To extend the experimental results, the flow was also numerically simulated using a Reynolds Averaged Navier-Stokes formulation with the "k-ε" turbulence model. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-01-05 2013-01-05T00:00:00Z 2060-01-05T00:00:00Z |
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/10400.6/12179 |
url |
http://hdl.handle.net/10400.6/12179 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Vieira, D.F.C., Silva, A.R.R., Neves, F.M.S.P., Carvalho, P.S.D., Barata, J.M.M. Numerical and Experimental Study of Two Impinging Jets in a Row through a Crossflow 51th Aerospace Sciences Meeting, Grapevine (Dallas/Ft. Worth Region), Texas, EUA, 7-10 janeiro, 2013 DOI: 10.2514/6.2013-806 978-162410181-6 10.2514/6.2013-806 |
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 |
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1799136407164289024 |