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Flow separation control behind a cylindrical bump using dielectric-barrier-discharge vortex generator plasma actuators

Published online by Cambridge University Press:  28 November 2017

Julie A. Vernet ,
Ramis Örlü Open the ORCID record for Ramis Örlü [Opens in a new window]  and
P. Henrik Alfredsson
Julie A. Vernet
Affiliation:
Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden
Ramis Örlü
Affiliation:
Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden
P. Henrik Alfredsson*
Affiliation:
Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden
*
†Email address for correspondence: phal@mech.kth.se
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Abstract

Dielectric-barrier-discharge plasma actuators are arranged to produce counter-rotating streamwise vortices to control flow separation on a cylindrical bump on a flat plate that is approached by a turbulent boundary layer. The control was tested for different free-stream velocities and actuation driving voltages. The recirculation area downstream of the bump was reduced by the actuation for velocities up to $15~\text{m}~\text{s}^{-1}$ at the highest voltage achievable of the present set-up. However, the flow shows a bi-modality, the nominal two-dimensional wake flow is shown to consist of large-scale streamwise vortices, which are energised by the actuation until a phenomenon of lock-on of these vortices occurs at sufficiently high driving voltages. The wavelength of the actuation is half that of the large-scale vortices. The lock-on shifts sometimes, i.e. the large streamwise vortices centre switch spanwise location, explaining the bi-modality in the flow. The details of the bi-modality are further investigated by conditional averaging and proper orthogonal decomposition.

JFM classification

Flow Control: Flow Control Wakes/Jets: Separated flows Wakes/Jets: Wakes/Jets
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 835 , 25 January 2018 , pp. 852 - 879
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Copyright
© 2017 Cambridge University Press 

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Footnotes

‡

Present address: Scania CV AB, SE-151 87 Södertälje, Sweden.

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