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Stabilization of the hypersonic boundary layer by finite-amplitude streaks
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Centra, SeRC - Swedish e-Science Research Centre. Swedish Defence Research Agency.ORCID-id: 0000-0002-5913-5431
2016 (Engelska)Ingår i: 54th AIAA Aerospace Sciences Meeting, 2016Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Stabilization of two-dimensional disturbances in hypersonic boundary layer flows by finite-amplitude streaks is investigated using nonlinear parabolized stability equations. The boundary-layer flows at Mach numbers 4.5 and 6.0 are studied in which both the first-and second modes are supported. The streaks considered here are driven either by the so-called optimal perturbations (Klebanoff-type) or the centrifugal instability (Görtler-type). When the streak amplitude is in an appropriate range, i.e., large enough to modulate the laminar boundary layer but low enough to not trigger secondary instability, both the first-and second modes can effectively be suppressed.

Ort, förlag, år, upplaga, sidor
2016.
Nyckelord [en]
Aerospace engineering, Aviation, Boundary layer flow, Boundary layers, Hypersonic flow, Laminar boundary layer, Nonlinear equations, Stabilization, Centrifugal instability, Finite amplitude, Optimal perturbation, Parabolized stability equations, Secondary instability, Hypersonic boundary layers
Nationell ämneskategori
Rymd- och flygteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-202001Scopus ID: 2-s2.0-85007499632ISBN: 9781624103933 (tryckt)OAI: oai:DiVA.org:kth-202001DiVA, id: diva2:1077048
Konferens
54th AIAA Aerospace Sciences Meeting, 2016, 4 January 2016 through 8 January 2016
Anmärkning

Funding text: J. Ren and S. Fu acknowledge the financial support by the National Natural Science Foundation of China (Grant No.11272183 and 11202115), the National Key Basic Research Program of China (Grant No.2014CB744801) and China Scholarship Council (No.201406210236).

QC 20170224

Tillgänglig från: 2017-02-24 Skapad: 2017-02-24 Senast uppdaterad: 2017-02-24Bibliografiskt granskad

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Hanifi, Ardeshir

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