Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/90299
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dc.contributorDepartment of Mechanical Engineeringen_US
dc.creatorLong, Ten_US
dc.creatorDong, Yen_US
dc.creatorZhao, Ren_US
dc.creatorWen, Cen_US
dc.date.accessioned2021-06-10T08:01:11Z-
dc.date.available2021-06-10T08:01:11Z-
dc.identifier.issn1070-6631en_US
dc.identifier.urihttp://hdl.handle.net/10397/90299-
dc.language.isoenen_US
dc.publisherAmerican Institute of Physicsen_US
dc.rights© 2021 Author(s).en_US
dc.rightsThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Long, T., Dong, Y., Zhao, R., & Wen, C. (2021). Mechanism of stabilization of porous coatings on unstable supersonic mode in hypersonic boundary layers. Physics of Fluids, 33(5), 054105.and may be found athttps://doi.org/10.1063/5.0048313.en_US
dc.rights© 2021 Author(s).en US
dc.rightsThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Tiehan Long (龙铁汉 ), Ying Dong (董颖 ), Rui Zhao (赵瑞 ), and Chihyung Wen (温志湧 ), "Mechanism of stabilization of porous coatings on unstable supersonic mode in hypersonic boundary layers", Physics of Fluids 33, 054105 (2021) and may be found at https://dx.doi.org/10.1063/5.0048313.en US
dc.titleMechanism of stabilization of porous coatings on unstable supersonic mode in hypersonic boundary layersen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.volume33en_US
dc.identifier.issue5en_US
dc.identifier.doi10.1063/5.0048313en_US
dcterms.abstractThis study clarifies the fundamental mechanism by which porous coatings suppress the supersonic mode instability in the hypersonic boundary layer (BL) by using Doak's momentum potential theory. The independent energy budget equations for vortical, acoustic, and thermal components of instabilities are derived. Data from direct numerical simulations of Mach 6.0 flat plate flows on a solid wall and porous coatings are then analyzed. By decomposing the momentum density into vortical, acoustic, and thermal components, the source terms and fluxes are studied based on their corresponding energy corollaries. The results demonstrate the role of different components in the generation and transport of the total fluctuation enthalpy (TFE) and the way in which the fluctuation energy is transferred between components. In the case of the solid wall, the oscillating disturbance on the BL consists of acoustic and vortical components. Near the critical layer, the positive acoustic source and energy transferred from the vortical component are primary energy producers for acoustic fluxes. Then, the TFE is transported outward by the acoustic component, which leads to “sound radiation” in the supersonic mode. In the case of the porous coating, the positive vortical source near the surface of the plate is suppressed significantly. Less vortical energy is transported to the critical layer, and thus less vortical energy is transformed into acoustic energy. Acoustic energy is eventually exhausted due to energy loss in the outward transport of the TFE, and “sound radiation” disappears from the porous coating.en_US
dcterms.accessRightsopen accessen_US
dcterms.bibliographicCitationPhysics of fluids, May 2021, v. 33, no. 5, 054105en_US
dcterms.isPartOfPhysics of fluidsen_US
dcterms.issued2021-05-
dc.identifier.scopus2-s2.0-85106036247-
dc.identifier.eissn1089-7666en_US
dc.identifier.artn054105en_US
dc.description.validate202106 bcvcen_US
dc.description.oaVersion of Recorden_US
dc.identifier.FolderNumbera0893-n01-
dc.identifier.SubFormID2097-
dc.description.fundingSourceSelf-fundeden_US
dc.description.pubStatusPublisheden_US
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