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Interrelation of phase-averaged volume force and capacitance of dielectric barrier discharge plasma actuators

Published online by Cambridge University Press:  14 November 2016

M. Kuhnhenn ,
B. Simon ,
I. Maden  and
J. Kriegseis
M. Kuhnhenn*
Affiliation:
Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Flughafenstraße 19, 64347 Griesheim, Germany
B. Simon
Affiliation:
Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Flughafenstraße 19, 64347 Griesheim, Germany
I. Maden
Affiliation:
Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Flughafenstraße 19, 64347 Griesheim, Germany
J. Kriegseis
Affiliation:
Institute of Fluid Mechanics, Karlsruhe Institute of Technology (KIT), Kaiserstraße 10, 76131 Karlsruhe, Germany
*
†Email address for correspondence: [email protected]
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Abstract

Simultaneous measurements of the phase-averaged velocity distribution and the underlying discharge quantities of a dielectric barrier discharge plasma actuator (PA) are performed at $10~\text{k}\text{Hz}$ discharge frequency to investigate the interplay of the discharge and the surrounding flow. The underlying velocity information for the force estimation is obtained by means of phase-averaged particle image velocimetry; the discharge quantities are determined from a Lissajous-figure analysis. The results uncover a clear cause–effect relation between the phase-dependent effective discharge capacitance of the PA and the resulting spatiotemporal volume-force distributions. From this novel insight, it must be concluded that the instantaneous effective discharge intensity dominates the momentum-transfer rate rather than the formerly assumed operating voltage.

JFM classification

Flow Control: Flow Control MHD and Electrohydrodynamics: MHD and Electrohydrodynamics MHD and Electrohydrodynamics: Plasmas
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 809 , 25 December 2016 , R1
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Copyright
© 2016 Cambridge University Press 

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