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Effect of upstream flow deformation using plasma actuators on crossflow transition induced by unsteady vortical free-stream disturbances
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.
2017 (English)In: 47th AIAA Fluid Dynamics Conference, 2017, American Institute of Aeronautics and Astronautics, 2017Conference paper (Refereed)
Abstract [en]

Upstream flow deformation (UFD) has been shown to be an effective technique to delay roughness induced laminar-turbulent transition at low free-stream turbulence level in three-dimensional boundary-layer flows. Beneficial steady crossflow vortex (CFV) control modes are excited and the resulting nonlinear CFVs induce a useful mean-flow distortion. We recently showed by direct numerical simulations that plasma actuators, modeled by localized steady volume forcing, can be employed to excite the UFD control modes. In the current work we investigate the same actuator set-ups to control transition caused by traveling CFVs that are excited by single unsteady vortical free-stream disturbances (FSDs) impinging on the boundary layer. FSDs of various wavenumbers and frequencies are imposed either upstream or downstream, or at the position of the actuators to also scrutinize if the volume forcing has a direct unfavorable effect on the receptivity to the FSDs that adds to the stabilization by the UFD. For all investigated cases we show that a significant transition delay is achieved.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2017.
Keywords [en]
Atmospheric thermodynamics, Boundary layer flow, Boundary layers, Deformation, Fluid dynamics, Laminar boundary layer, Vortex flow, Control modes, Freestream turbulence, Laminar turbulent transitions, Plasma actuator, Steady crossflow, Three-dimensional boundary layer flows, Transition delays, Upstream flow, Actuators
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-212167Scopus ID: 2-s2.0-85023622940ISBN: 9781624105005 OAI: oai:DiVA.org:kth-212167DiVA, id: diva2:1133753
Conference
47th AIAA Fluid Dynamics Conference, 2017, Denver, United States, 5 June 2017 through 9 June 2017
Funder
Swedish e‐Science Research Center
Note

QC 20170816

Available from: 2017-08-16 Created: 2017-08-16 Last updated: 2017-08-16Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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Output format
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