Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/93029
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dc.contributorDepartment of Mechanical Engineeringen_US
dc.contributorDepartment of Aeronautical and Aviation Engineeringen_US
dc.creatorTian, Xen_US
dc.creatorWen, Cen_US
dc.date.accessioned2022-05-30T07:40:11Z-
dc.date.available2022-05-30T07:40:11Z-
dc.identifier.issn0022-1120en_US
dc.identifier.urihttp://hdl.handle.net/10397/93029-
dc.language.isoenen_US
dc.publisherCambridge University Pressen_US
dc.rightsThis article has been published in a revised form in Journal of Fluid Mechanics [http://doi.org/10.1017/jfm.2020.981]. This version is free to view and download for private research and study only. Not for re-distribution or re-use. © The Author(s), 2020.en_US
dc.rightsWhen citing an Accepted Manuscript or an earlier version of an article, the Cambridge University Press requests that readers also cite the Version of Record with a DOI link. The article is subsequently published in revised form in Journal of Fluid Mechanics [http://doi.org/10.1017/jfm.2020.981].en_US
dc.subjectBoundary layer controlen_US
dc.subjectBoundary layer stabilityen_US
dc.subjectTransition to turbulenceen_US
dc.titleGrowth mechanisms of second-mode instability in hypersonic boundary layersen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.volume908en_US
dc.identifier.doi10.1017/jfm.2020.981en_US
dcterms.abstractStability analyses based on the rates of change of perturbations were performed to study the growth mechanisms of second-mode instability in hypersonic boundary layers. The results show that the streamwise velocity perturbation is strengthened by the concurrence of the momentum transfer due to the wall-normal velocity fluctuation and the streamwise gradient of the pressure perturbation near the wall, while the wall-normal velocity perturbation is dominated by the wall-normal gradient of the pressure perturbation. Meanwhile, the change of fluctuating internal energy is sustained by the advection of perturbed thermal energy in the vicinity of the critical layer and by the dilatation fluctuation near the wall. The energy transport by the wall-normal velocity fluctuation accounts for the growth of second-mode instability, and the growth rate depends on the relative phase of the energy transport by the wall-normal velocity fluctuation to the total time rate of change of fluctuating internal energy in the vicinity of the critical layer. Moreover, this relative phase is associated with the mutual interaction between the critical-layer fluctuation and the near-wall fluctuation. Porous walls recast this mutual interaction by delaying the phase of the wall-normal energy transport near the wall, resulting in the stabilization of the second mode.en_US
dcterms.accessRightsopen accessen_US
dcterms.bibliographicCitationJournal of fluid mechanics, 10 Feb. 2021, v. 908, R4en_US
dcterms.isPartOfJournal of fluid mechanicsen_US
dcterms.issued2021-02-10-
dc.identifier.scopus2-s2.0-85097878973-
dc.identifier.eissn1469-7645en_US
dc.identifier.artnR4en_US
dc.description.validate202205 bchyen_US
dc.description.oaAccepted Manuscripten_US
dc.identifier.FolderNumberME-0336-
dc.description.fundingSourceRGCen_US
dc.description.fundingSourceOthersen_US
dc.description.fundingTextNatural Science Foundation of Chinaen_US
dc.description.pubStatusPublisheden_US
dc.identifier.OPUS43059218-
dc.description.oaCategoryGreen (AAM)en_US
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