Flow Characteristics over Double Delta Wings at Low Reynolds Numbers

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dc.authoridKarasu, Ilyas/0000-0003-3138-6236
dc.authoridDurhasan, Tahir/0000-0001-5212-9170
dc.contributor.authorKarasu, Ilyas
dc.contributor.authorDurhasan, Tahir
dc.date.accessioned2025-01-06T17:37:30Z
dc.date.available2025-01-06T17:37:30Z
dc.date.issued2020
dc.description.abstractWithin the scope of this study, a quantitative investigation was carried out employing the particle image velocimetry (PIV) technique to determine vortical flow characteristics of 70 degrees/40 degrees, 70 degrees/50 degrees, and 70 degrees/55 degrees double delta wings (DDWs). Experiments were performed in four chordwise sections (x/c=0.5, 0.6, 0.8, and 1) at two Reynolds numbers (R=1x104 and 2.5x104) and different angles of attack (alpha=5 degrees, 10 degrees, 15 degrees, and 25 degrees). It was observed that the secondary vortex is dominant on flow characteristics of double delta wings at low Reynolds numbers. The strengths of vortices increase with increases of both the wing sweep angle and Reynolds number. Furthermore, the location of wing vortex breakdown moves farther downstream as the wing sweep angle increased. Depending on the angle of attack, Reynolds number, and the wing sweep angle, either dual (strake and wing) or triple (strake, wing, and secondary) leading-edge vortices were observed. At a Reynolds number value R=1x104 and angles of attack in the range of alpha <= 15 degrees, the interactions of the vortices influence the flow structure significantly. Dominant frequencies of the vortices are detected near the shear layer formed between the strake vortex and secondary vortex, generally. Moreover, the spectral analyses indicated that bursting of the vortices causes complicated flow patterns over double delta wings, including small-scale vortices. It was found that the transverse Reynolds normal stress concentrates at chordwise sections where secondary vortices are dominant, whereas the locations of peak magnitude of vertical Reynolds normal stress coincide with the strake vortex cores.
dc.identifier.doi10.1061/(ASCE)AS.1943-5525.0001155
dc.identifier.issn0893-1321
dc.identifier.issn1943-5525
dc.identifier.issue4
dc.identifier.scopus2-s2.0-85084336291
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1061/(ASCE)AS.1943-5525.0001155
dc.identifier.urihttps://hdl.handle.net/20.500.14669/2250
dc.identifier.volume33
dc.identifier.wosWOS:000536130300004
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherAsce-Amer Soc Civil Engineers
dc.relation.ispartofJournal of Aerospace Engineering
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectDouble delta wing (DDW)
dc.subjectVortical flow
dc.subjectWing sweep angle
dc.subjectParticle image velocimetry (PIV)
dc.titleFlow Characteristics over Double Delta Wings at Low Reynolds Numbers
dc.typeArticle

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