Pulsed plasma actuators for active flow control at MAV Reynolds numbers

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Pulsed plasma actuators for active flow control at MAV Reynolds numbers

Göksel, B. / Greenblatt, D. / Rechenberg, I. / Kastantin, Y. / Nayeri, C.N. / Paschereit, C.O.

An experimental investigation of separation control using steady and pulsed plasma actuators was carried out on an Eppler E338 airfoil at typical micro air vehicle Reynolds numbers (20,000<=Re<=140,000). Pulsing was achieved by modulating the high frequency plasma excitation voltage. The actuators were calibrated directly using a laser doppler anemometer, with and without free-stream velocity, and this allowed the quantification of both steady and unsteady momentum introduced into the flow. At conventional low Reynolds numbers (Re>100,000) asymmetric single phase plasma actuators can have a detrimental effect on airfoil performance due to the introduction of low momentum fluid into the boundary layer. The effect of modulation, particularly at frequencies corresponding to F⁺ nearly equal 1, became more effective with decreasing Reynolds number resulting in significant improvements in C_L,max. This was attributed to the increasing momentum coefficient, which increased as a consequence of the decreasing free-stream velocities. Particularly low duty cycles of 3% were sufficient for effective separation control, corresponding to power inputs on the order of 5 milliwatts per centimeter.

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Dokumentinformationen

Titel :

Pulsed plasma actuators for active flow control at MAV Reynolds numbers

Weitere Titelangaben:

Gepulste Plasmaaktoren für aktive Strömungsregelung bei Reynolds-Zahlen von Mikroluftfahrzeugen

Beteiligte:

Göksel, B. (Autor:in) / Greenblatt, D. (Autor:in) / Rechenberg, I. (Autor:in) / Kastantin, Y. (Autor:in) / Nayeri, C.N. (Autor:in) / Paschereit, C.O. (Autor:in)

Erschienen in:

Active Flow Control 2006, 2007 ; 42-55

Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM) ; 95

Erscheinungsdatum :

2007

Format / Umfang :

14 Seiten, 13 Bilder, 1 Tabelle, 17 Quellen

ISBN :

978-3-540-71438-5

ISSN :

1612-2909

DOI :