Dielectric-barrier-discharge vortex generators: characterisation and optimisation for flow separation control |
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Authors: | Timothy N Jukes Kwing-So Choi |
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Affiliation: | (1) Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK |
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Abstract: | We investigated the use of dielectric-barrier-discharge plasma actuators as vortex generators for flow separation control
applications. Plasma actuators were placed at a yaw angle to the oncoming flow, so that they produced a spanwise wall jet.
Through interaction with the oncoming boundary layer, this created a streamwise longitudinal vortex. In this experimental
investigation, the effect of yaw angle, actuator length and plasma-induced velocity ratio was studied. Particular attention
was given to the vortex formation mechanism and its development downstream. The DBD plasma actuators were then applied in
the form of co-rotating and counter-rotating vortex arrays to control flow separation over a trailing-edge ramp. It was found
that the vortex generators were successful in reducing the separation region, even at plasma-to-free-stream velocity ratios
of less than 10%. |
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