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Spanwise boundary layer modulations using finite discrete suction for transition delay
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-3251-8328
2017 (engelsk)Inngår i: Experiments in Fluids, ISSN 0723-4864, E-ISSN 1432-1114, Vol. 58, nr 3, artikkel-id 14Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Discrete suction is deployed in a flat plate boundary layer to create spanwise mean velocity gradients (SVG) with the goal of delaying the onset of laminar-to-turbulent transition. It is shown that finite boundary layer suction through a set of holes in a spanwise oriented array in the flat plate is successful in setting up steady and robust streamwise streaks in the boundary layer. Today, the SVG method for transition control is known to attenuate the growth of Tollmien-Schlichting (TS) waves and delay the transition to turbulence. In this investigation, low-amplitude forced TS waves are attenuated with the implication of extending the laminar flow by at least 120% for a discrete suction of 0.8% of the free-stream velocity. The control technique is also tested successfully for natural transition, with a resulting transition delay of 30%.

sted, utgiver, år, opplag, sider
SPRINGER , 2017. Vol. 58, nr 3, artikkel-id 14
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URN: urn:nbn:se:kth:diva-205506DOI: 10.1007/s00348-017-2301-6ISI: 000397980600003Scopus ID: 2-s2.0-85012026192OAI: oai:DiVA.org:kth-205506DiVA, id: diva2:1094668
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QC 20170510

Tilgjengelig fra: 2017-05-10 Laget: 2017-05-10 Sist oppdatert: 2017-05-10bibliografisk kontrollert

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Fransson, Jens H. M.

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