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Etude de l'écoulement induit par une décharge à barrière diélectrique surfacique : contribution au contrôle des écoulements subsoniques par actionneurs plasmas

Abstract : Active flow control is a key issue to meet the environmental requirements for the next generations of aircrafts and cars. The aim of this work is to study subsonic airflows control by plasma actuators in order to improve aerodynamic performances (drag reduction and lift enhancement). The actuator consists in using a surface dielectric barrier discharge with a thin dielectric made by a combination of two polymer materials. The first part of this work is dedicated to the experimental study of the flow induced by the actuator in quiescent air according to the regime of the discharge. An empirical law is proposed in order to determine the velocity of the ionic wind as a function of the high voltage and the frequency of the actuator. From this law the main properties of the wall jet induced by the discharge are predicted. In the second part of the study the actuator is used for wind tunnel experiments for three configurations of increasing complexity: laminar boundary layer (flat plane), separated turbulent boundary layer (wing profile) and 3D separated boundary layer (Ahmed body with rear window tilted at 25°). Significant results are obtained for Reynolds numbers up to 1.7.106 (35 m/s).
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  • HAL Id : tel-00501829, version 2

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Vincent Boucinha. Etude de l'écoulement induit par une décharge à barrière diélectrique surfacique : contribution au contrôle des écoulements subsoniques par actionneurs plasmas. Autre. Université d'Orléans, 2009. Français. ⟨NNT : 2009ORLE2059⟩. ⟨tel-00501829v2⟩

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