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Delay of natural transition with dielectric barrier discharges

Delay of natural transition with dielectric barrier discharges Delay of boundary-layer transition along a flat plate with adverse pressure gradient is achieved via dielectric barrier discharges. In contrast to earlier investigations, transition is initiated by naturally occurring Tollmien–Schlichting waves. A single dielectric barrier discharge actuator is used to create a body force that locally alters the flow stability leading to an attenuation of broadband disturbances. Hot-wire measurements characterize the resulting transition delay, and particle image velocimetry clarifies the local influence on the velocity profiles. Linear stability theory is applied to analyze a numerical solution of this boundary-layer flow, showing good agreement with the experimentally measured data. The stability analysis shows that disturbances are locally attenuated and transition is correctly predicted to occur at Reynolds numbers increased by 10 %. In contrast to previous investigations, the experiments are conducted at a reasonably high free-stream velocity of 20 m/s paving the way for planned in-flight experiments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Delay of natural transition with dielectric barrier discharges

Duchmann, A.; Grundmann, S.; Tropea, C.
Experiments in Fluids , Volume 54 (3) – Mar 9, 2013
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References (34)

Publisher
Springer Journals
Copyright
Copyright © 2013 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
DOI
10.1007/s00348-013-1461-2
Publisher site
See Article on Publisher Site

Abstract

Delay of boundary-layer transition along a flat plate with adverse pressure gradient is achieved via dielectric barrier discharges. In contrast to earlier investigations, transition is initiated by naturally occurring Tollmien–Schlichting waves. A single dielectric barrier discharge actuator is used to create a body force that locally alters the flow stability leading to an attenuation of broadband disturbances. Hot-wire measurements characterize the resulting transition delay, and particle image velocimetry clarifies the local influence on the velocity profiles. Linear stability theory is applied to analyze a numerical solution of this boundary-layer flow, showing good agreement with the experimentally measured data. The stability analysis shows that disturbances are locally attenuated and transition is correctly predicted to occur at Reynolds numbers increased by 10 %. In contrast to previous investigations, the experiments are conducted at a reasonably high free-stream velocity of 20 m/s paving the way for planned in-flight experiments.

Journal

Experiments in Fluids – Springer Journals

Published: Mar 9, 2013

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