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Etude de décharges électriques dans l'air pour le développement d'actionneurs plasmas – Application au contrôle de décollements d'écoulements

Abstract : The plasma actuator consists in an electrical discharge established in air at atmospheric pressure between two electrodes flush mounted on the surface of a test profile. Under Coulombic forces, ions created by this non-thermal plasma drift and induce a fluid motion called “ionic wind”. Here, this electrical process is used to modify the detachment or the reattachment of an airflow.
The present report is divided in two parts.
The first part is dedicated to the development of the actuator in order to obtain a stable and homogeneous discharge. Two discharges are investigated: a corona discharge and a dielectric barrier discharge (DBD). For the corona discharge, a DC or AC high voltage is applied between two wires placed inside grooves. The means electric field is about 8 kV/cm and the mean current is 1.5 mA/m for a mean electrical power of 75 W/cm2. The DBD is obtained by applying an alternative high voltage (some kV with frequency of 100 up to some kHz) between two electrodes disposed of each side of the dielectric. Ionic wind measurements showed that for both discharge the velocity is about 3 m/s at 1 mm above the surface of the test profile.
In a second part, the effect of the actuator is analysed for airflow control. A preliminary study at low velocity (< 2 m/s) demonstrated the ability of the actuator to reattach a naturally detached airflow and to control eddies created downstream by a pulse discharge. At upper velocities (´ 30 m/s), the actuator is used to control the detachment and reattachment in the case of a plane mixing layer and a turbulent jet. Results showed that the control modified the development properties of the downstream airflow as the thickness of the mixing layer or jet deflection in the case of a turbulent jet. More, these lasts experiments seems indicated that the actuator is more efficient to detach an airflow than reattached it when the actuator used is the DBD.
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Contributor : Alexandre Labergue <>
Submitted on : Tuesday, April 11, 2006 - 6:22:46 PM
Last modification on : Monday, March 18, 2019 - 5:18:04 PM
Long-term archiving on: : Saturday, April 3, 2010 - 9:49:19 PM

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  • HAL Id : tel-00012120, version 1

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Alexandre Labergue. Etude de décharges électriques dans l'air pour le développement d'actionneurs plasmas – Application au contrôle de décollements d'écoulements. Dynamique des Fluides [physics.flu-dyn]. Université de Poitiers, 2005. Français. ⟨tel-00012120⟩

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