Drag reduction by ac streamer corona discharges along a wing-like profile plate

Shcherbakov, Y.V.; Ivanov, Nikolay; Baryshev, N.; Frolovskij, V.; Syssoev, V. S.

doi:10.2514/6.2000-2670

Cited by 12 publications

(9 citation statements)

References 1 publication

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“…With these devices the goal is usually to use the electric wind produced by the plasma in order to modify the properties of the boundary layer close to the wall. In general, the control strategy intends (1) to accelerate the fluid close to the wall, in order to avoid fluid separation (this is the case when the electric wind and the free air stream are in the same direction), (2) to induce the separation with the help of a counter-flow electric wind or (3) to induce perturbations inside the boundary layer by using a pulsed discharge, in the streamwise or spanwise direction, to modify the turbulence level or Tolmien Schlichting waves.…”

Section: Introductionmentioning

confidence: 99%

Electric wind produced by surface plasma actuators: a new dielectric barrier discharge based on a three-electrode geometry

Moreau¹,

Sosa²,

Artana³

2008

J. Phys. D: Appl. Phys.

129

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Active flow control is a rapidly developing topic because the associated industrial applications are of immense importance, particularly for aeronautics. Among all the flow control methods, such as the use of mechanical flaps or wall jets, plasma-based devices are very promising devices. The main advantages of such systems are their robustness, their simplicity, their low-power consumption and that they allow a real-time control at high frequency. This paper deals with an experimental study about the electric wind produced by a surface discharge based on a three-electrode geometry. This new device is composed of a typical two-electrode surface barrier discharge excited by an AC high voltage, plus a third electrode at which a DC high voltage is applied in order to extend the discharge region and to accelerate the ion drift velocity. In the first part the electrical current of these different surface discharges is presented and discussed. This shows that the current behaviour depends on the DC component polarity. The second part is dedicated to analysing the electric wind characteristics through Schlieren visualizations and to measuring its time-averaged velocity with a Pitot tube sensor. The results show that an excitation of the electrodes with an AC voltage plus a positive DC component can significantly modify the topology of the electric wind produced by a single DBD. In practice, this DC component allows us to increase the value of the maximum induced velocity (up to +150% at a few centimetres downstream of the discharge) and the plasma extension, to enhance the depression occurring above the discharge region and to increase the discharge-induced mass flow rate (up to +100%), without increasing the electrical power consumption.

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Section: Introductionmentioning

confidence: 99%

Electric wind produced by surface plasma actuators: a new dielectric barrier discharge based on a three-electrode geometry

Moreau¹,

Sosa²,

Artana³

2008

J. Phys. D: Appl. Phys.

129

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“…As a consequence of the elastic collisions between the migrating charged particles and the neutral species of the gas, the neutrals increase their momentum giving rise to an 'electric wind' in the close vicinity of the wall. When the number of charged species is high, other mechanisms may add to this electromechanical coupling like alterations of the physical properties of the gas (density, viscosity, etc) in the regions of ionization that are very close to the flow boundaries (Scherbakov et al 2000). In EHD devices the magnetic forces are negligible when compared with the electric ones because the actuation is produced with very low current intensities, and they are attractive from a technological point of view because of their simplicity (they have no moving parts) and their very short response time (delays in the establishment of a discharge are theoretically of the order of nanoseconds for appropriate values of the driving voltage).…”

Section: Introductionmentioning

confidence: 99%

Discharge characteristics of plasma sheet actuators

Sosa¹,

Artana²,

Grondona³

et al. 2007

J. Phys. D: Appl. Phys.

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The electrical characteristics of a plasma sheet device used for subsonic airflow control are studied in this paper. Experiments are undertaken with a two-wire asymmetrical (different diameters, opposite polarity) electrode configuration connected to dc high voltage sources in the presence of a dielectric plate and under different gases (dry air, nitrogen and oxygen). For large distances electrode-plates it has been found that the discharge current consists of a purely dc component. The proximity of the plate reduces notably this dc current component until a limit situation for which the electrodes practically lay on the plate and a current pulsed regime is superimposed on the dc (small) component, thus establishing a plasma sheet regime. This regime could be reached only when the small wire was positive. This work establishes that the pulsed regime may be associated with a succession of positive streamers (cathode directed) which formation is promoted by different parameters of the gas and surface characteristics (thresholds of photoionization and photoemission, charge deposition,...). The dc component seems to be produced by a small number of electrons originated in the ionization region of the negative corona that are amplified in the ionization region of the positive corona. The charged particles produced during the streamer propagation could contribute appreciably to the ion momentum transfer to the gas. This transfer should be due very likely to the drift of the charged species present in the streamer channel during the streamer collapsing phase. The source of momentum transfer associated with the dc current would always persist with a magnitude that depends on the intensity of this current.

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“…Other mechanisms like alterations of the physical properties of the gas (density, viscosity, etc), may eventually contribute to the electromechanical coupling discharge-airflow [2]- [3].…”

Section: Introductionmentioning

confidence: 99%

Study of the flow induced by a sliding discharge

Sosa

Arnaud

Mémin

et al. 2009

IEEE Trans. Dielect. Electr. Insul.

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In this work, we report on electrical and fluid-dynamics studies concerning the flow induced by a sliding discharge (SD). This kind of discharge was created with a three electrode system configuration: one excited with ac and the others with a dc negative voltage. The SD was activated on a quiescent fluid at atmospheric pressure. The flow field induced by the SD was analysed by measurements undertaken with Pitot probes and Schlieren Image Velocimetry. Under the conditions of our experiments two "jet flows", that blown towards the interelectrode space, were induced from the air exposed electrodes. As a consequence of the mutual interaction of these two flows and of the magnitude of each flow, a resulting plume like planar jet of adjustable direction (0-180º) could be formed. A robust control of the axis direction of the plume could be achieved by modifying the ac voltage value.

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Drag reduction by ac streamer corona discharges along a wing-like profile plate

Cited by 12 publications

References 1 publication

Electric wind produced by surface plasma actuators: a new dielectric barrier discharge based on a three-electrode geometry

Electric wind produced by surface plasma actuators: a new dielectric barrier discharge based on a three-electrode geometry

Discharge characteristics of plasma sheet actuators

Study of the flow induced by a sliding discharge

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