Experimental Analysis of Pressure Shielding Mechanisms in Bioinspired Unidirectional Canopies

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dc.contributor.authorHari, Nandita Nuranien
dc.contributor.authorSzöke, Mátéen
dc.contributor.authorDevenport, William J.en
dc.contributor.authorGlegg, Stewarten
dc.date.accessioned2023-02-23T15:48:45Zen
dc.date.available2023-02-23T15:48:45Zen
dc.date.issued2022-11-01en
dc.date.updated2023-02-19T19:49:27Zen
dc.description.abstractPrevious studies have demonstrated that treatments such as a canopy or finlets placed within a boundary layer can shield surfaces from unsteady pressure fluctuations without substantially compromising the aerodynamic per-formance. This paper describes research into fundamental mechanisms of this phenomenon known as pressure shielding. Unidirectional canopy is an idealized surface treatment which consists of a streamwise array of rods cantilevered at the downstream end, inspired from the downy coating on owls’ wings. Experiments show that such a canopy attenuates the surface pressure in two distinct frequency ranges. At low frequencies associated with convective scales much greater than the canopy height, the attenuation spectra show scaling on the Strouhal number based on canopy height. At high frequencies, associated with convective scales of the order of the canopy height or lower, a dissipation-type frequency scaling appears more appropriate. The ratio of streamwise distance over the height is an important parameter at the low-frequency regions of attenuation, while the open-area ratio controls the broadband magnitude of attenuation spectra. Spatial and temporal correlations further shed light on the effects of the canopy in reducing the larger, energetic turbulent structures associated with the wall jet unsteady surface pressure fluctuations.en
dc.description.versionAccepted versionen
dc.format.extentPages 6447-6462en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.2514/1.J061461en
dc.identifier.eissn1533-385Xen
dc.identifier.issn0001-1452en
dc.identifier.issue11en
dc.identifier.orcidDevenport, William [0000-0002-3413-861X]en
dc.identifier.orcidSzoke, Tibor [0000-0002-3768-7956]en
dc.identifier.urihttp://hdl.handle.net/10919/113923en
dc.identifier.volume60en
dc.language.isoenen
dc.publisherAmerican Institute of Aeronautics and Astronauticsen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.titleExperimental Analysis of Pressure Shielding Mechanisms in Bioinspired Unidirectional Canopiesen
dc.title.serialAIAA Journalen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherJournal Articleen
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Engineeringen
pubs.organisational-group/Virginia Tech/Engineering/Aerospace and Ocean Engineeringen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineering/COE T&R Facultyen

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