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Laser Doppler Measurements of Twin Impinging Jets Aligned with a Crossflow

2014-07Journal article Open access
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dc.contributor.authorBarata, Jorge M M
dc.contributor.authorCarvalho, Pedro dos Santos Duarte
dc.contributor.authorNeves, Fernando M. S. P.
dc.contributor.authorSilva, André
dc.contributor.authorVieira, Diana
dc.contributor.authorDurão, Diamantino
dc.date.accessioned2022-01-06T15:53:22Z
dc.date.available2022-01-06T15:53:22Z
dc.date.issued2014-07
dc.description.abstractThis paper presents a detailed analysis of the complex flow beneath two impinging jets aligned with a low-velocity crossflow which is relevant for the future F-35 VSTOL configuration, and provides a quantitative picture of the main features of interest for impingement type of flows. The experiments were carried out for a Reynolds number based on the jet exit conditions of Rej = 4.3  104, an impingement height of 20.1 jet diameters and for a velocity ratio between the jet exit and the crossflow VR = Vj/Uo of 22.5. The rear jet is located at S = 6 D downstream of the first jet. The results show a large penetration of the first (upstream) jet that is deflected by the crossflow and impinges on the ground, giving rise to a ground vortex due to the collision of the radial wall and the crossflow that wraps around the impinging point like a scarf. The rear jet (located downstream) it is not so affected by the crossflow in terms of deflection, but due to the downstream wall jet that flows radially from the impinging point of the first jet it does not reach the ground. The results indicate a new flow pattern not yet reported so far, that for a VSTOL aircraft operating in ground vicinity with front wind or small forward movement may result in enhanced under pressures in the aft part of the aircraft causing a suction down force and a change of the pitching moment towards the ground.pt_PT
dc.description.sponsorshipFundação para a Ciência e a Tecnologiapt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.17265/2159-5348/2014.07.001pt_PT
dc.identifier.issn2159-5348
dc.identifier.urihttp://hdl.handle.net/10400.6/11554
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherDavid Publishing Companypt_PT
dc.relationTurbulent Structure of the Impact Zone of a Ground Vortex Flow
dc.relation.publisherversionhttps://www.davidpublisher.com/Public/uploads/Contribute/55caf95a79160.pdfpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectVSTOLpt_PT
dc.subjectGround vortexpt_PT
dc.subjectTurbulencept_PT
dc.subjectComplex flowspt_PT
dc.titleLaser Doppler Measurements of Twin Impinging Jets Aligned with a Crossflowpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleTurbulent Structure of the Impact Zone of a Ground Vortex Flow
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FEME-MFE%2F102190%2F2008/PT
oaire.citation.endPage411pt_PT
oaire.citation.issue7pt_PT
oaire.citation.startPage403pt_PT
oaire.citation.titleJournal of Physical Science and Applicationpt_PT
oaire.citation.volume4pt_PT
oaire.fundingStream5876-PPCDTI
person.familyNameMartins Barata
person.familyNameSilva Pereira das Neves
person.familyNameResende Rodrigues da Silva
person.familyNameVieira
person.familyNameDurão
person.givenNameJorge Manuel
person.givenNameFernando Manuel da
person.givenNameAndré
person.givenNameDiana
person.givenNameDiamantino
person.identifierhFY_5JYAAAAJ&hl
person.identifierJ-4185-2012
person.identifier.ciencia-idF611-BBCC-DAA8
person.identifier.ciencia-idBC15-D534-3DCC
person.identifier.ciencia-id8219-4B2B-E1C7
person.identifier.ciencia-idC410-A26E-8F83
person.identifier.orcid0000-0001-9014-5008
person.identifier.orcid0000-0002-5826-7459
person.identifier.orcid0000-0002-4901-7140
person.identifier.orcid0000-0003-0411-5270
person.identifier.orcid0000-0001-5443-5382
person.identifier.scopus-author-id11439470600
person.identifier.scopus-author-id11440407500
person.identifier.scopus-author-id55252408000
person.identifier.scopus-author-id7005535590
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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