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Miniature vortex generators for flow control in falkner-skan boundary layers
KTH.
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics.
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics.ORCID iD: 0000-0002-3251-8328
2017 (English)In: AIAA Journal, ISSN 0001-1452, E-ISSN 1533-385X, Vol. 55, no 2, p. 352-364Article in journal (Refereed) Published
Abstract [en]

Vortex generators with heights comparable to displacement thickness are an effective means of producing persistent mean-flow streaks in laminar boundary layers. Inducing streaky base flows can suppress the growth of unsteady disturbances that would otherwise incite laminar-to-turbulent transition. Previous experimental and numerical works demonstrated the versatility of these miniature vortex generators in zero-pressure-gradient boundary layers. In this work, mean-flow disturbances developing from miniature vortex generators in adverse and favorable pressure-gradient boundary layers are measured systemically to assess the possibility of extending miniature vortex generator-based flow control to these scenarios. Boundary-layer streak amplitudes are measured across a range of Falkner-Skan m values, and an empirical scaling is found based on existing results. The effect of streaks on transition in an adverse pressure-gradient boundary layer is also tested, and moderate increases to laminar flow extents are observed.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics Inc. , 2017. Vol. 55, no 2, p. 352-364
Keywords [en]
Boundary layer flow, Boundary layers, Flow control, Laminar flow, Pressure gradient, Turbulent flow, Vortex flow, Adverse pressure gradient, Boundary layer streaks, Displacement thickness, Favorable pressure gradients, Laminar to turbulent transitions, Streaky base flow, Unsteady disturbance, Zero-pressure-gradient boundary layers, Laminar boundary layer
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207422DOI: 10.2514/1.J055332ISI: 000395555300002Scopus ID: 2-s2.0-85012866259OAI: oai:DiVA.org:kth-207422DiVA, id: diva2:1098538
Note

QC 20170524

Available from: 2017-05-24 Created: 2017-05-24 Last updated: 2017-05-24Bibliographically approved

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Fallenius, Bengt E. G.Fransson, Jens H. M.

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