New Insights in the Physics of DBD Plasma Actuators for Flow Control

Boeuf, Jean-Pierre; Lagmich, Youssef; Callegari, Thierry; Pitchford, L. C.; Unfer, Thomas

doi:10.2514/6.2008-1376

Cited by 19 publications

(26 citation statements)

References 12 publications

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“…Plasma actuators generate an electrohydrodynamic (EHD) body force. This transfers momentum through a collisional mechanism from charged particles accelerated by the electric field to neutral particles in the surrounding gas (Boeuf et al 2007). This induces a net flow away from the exposed electrode, with direction to the right in figure 1.…”

Section: Dielectric-barrier-discharge Plasma Actuatorsmentioning

confidence: 99%

On the formation of streamwise vortices by plasma vortex generators

Jukes

Choi

2013

J. Fluid Mech.

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The streamwise vortices generated by dielectric-barrier-discharge plasma actuators in the laminar boundary layer were investigated using particle image velocimetry to understand the vortex-formation mechanisms. The plasma vortex generator was oriented along the primary flow direction to produce a body force in the spanwise direction. This created a spanwise-directed wall jet which interacted with the oncoming boundary layer to form a coherent streamwise vortex. It was found that the streamwise vortices were formed by the twisting and folding of the spanwise vorticity in the oncoming boundary layer into the outer shear layer of the spanwise wall jet, which added its own vorticity to increase the circulation along the actuator length. This is similar to the delta-shaped, vane-type vortex generator, except that the circulation was enhanced by the addition of the vorticity in the plasma jet. It was also observed that the plasma vortex was formed close to the wall with an enhanced wall-ward entrainment, which created strong downwash above the actuator.

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Section: Dielectric-barrier-discharge Plasma Actuatorsmentioning

confidence: 99%

On the formation of streamwise vortices by plasma vortex generators

Jukes

Choi

2013

J. Fluid Mech.

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“…The input power (averaged one cycle) of each plasma actuator per unit length of electrode could be calculated according to function The results show that the input powers for straight, 150 • -elliptic arc and 180 • -elliptic arc plasma actuator are 26 W/m, 25.6W/m and 25.5 W/m, respectively, which means that the electrical bodyforce on these actuators are almost the same. 19 By analyzing the results, we consider that the various jet flow field distributions under different actuators in this study are mainly attributed to the different plasma discharge area. (Fig.…”

Section: Influence Of Electrode Structure On Jicfmentioning

confidence: 99%

An experimental study of plasma aerodynamic actuation on a round jet in cross flow

Dai

Yang

et al. 2015

AIP Advances

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The present paper is performed on the effect of plasma aerodynamic actuation on a round jet in cross flow field with a low Reynolds number by using smoke visualization. The actuator is constituted by an electrode pair separated by a dielectric Al2O3 sheet. Several AC supply conditions are utilized. The experimental result shows a closing-in tendency of the jet flow toward the wall after being induced by plasma aerodynamic actuation, and such tendency is increasingly intensified as the actuation voltage increases. Numerical simulation is also performed. The simulation results show that an induced vortex pair is generated by plasma aerodynamic actuation near the wall flow field. The rotation direction of the induced vortex pair reverses against the counter-rotating vortex pair generated by a round jet in a cross flow without plasma aerodynamic actuation. Then the strength and structural size of the counter-rotating vortex pair are significantly reduced, resulting in the intensified near-wall effect of the jet flow. Three electrode-typed actuators (straight, 150°-elliptic arc and 180°-elliptic arc with the same streamwise extent) are placed at the exit of round jet to research the influence of electrode structure on jet in cross flow. The result shows that the longer the arc electrode surrounding the hole, the stronger the induced jet that flow near the wall is.

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“…Based on simulation results, Boeuf et al 17 predicted that the value of the secondary electron emission coefficient of the electrode (which, in their model, was set equal to the coefficient for the dielectric) would have little effect on the force induced by the actuator, while being a strong predictor of dissipated power. Our data suggests that changing the secondary electron emission coefficient of just the exposed electrode has little effect on the induced force or on the dissipated power.…”

Section: Of 11mentioning

confidence: 99%

Comparisons of Force Measurement Methods for DBD Plasma Actuators in Quiescent Air

Hoskinson

Hershkowitz

Ashpis

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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We have performed measurements of the force induced by both single (one electrode insulated) and double (both electrodes insulated) dielectric barrier discharge plasma actuators in quiescent air. We have shown that, for single barrier actuators with cylindrical exposed electrodes, as the electrode diameter decrease the force efficiencies increase much faster than a previously reported linear trend. This behavior has been experimentally verified using two different measurement techniques: stagnation probe measurements of the induced flow velocity and direct measurement of the force using an electronic balance. Actuators with rectangular cross-section exposed electrodes do not show the same rapid increase at small thicknesses. We have also shown that the induced force is independent of the material used for the exposed electrode. The same techniques have shown that the induced force of a double barrier actuator increases with decreasing narrow electrode diameter.

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New Insights in the Physics of DBD Plasma Actuators for Flow Control

Cited by 19 publications

References 12 publications

On the formation of streamwise vortices by plasma vortex generators

On the formation of streamwise vortices by plasma vortex generators

An experimental study of plasma aerodynamic actuation on a round jet in cross flow

Comparisons of Force Measurement Methods for DBD Plasma Actuators in Quiescent Air

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