Boundary Layer Control with Atmospheric Plasma Discharges

Font, Gabriel

doi:10.2514/1.18542

Cited by 83 publications

(23 citation statements)

References 18 publications

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“…Introduction T HERE is currently considerable interest in the use of single dielectric barrier discharge (SDBD) plasma actuators for aerodynamic flow control. The diverse applications are too numerous to list here but include, for example, active airfoil leading edge separation control [1,2], control of airfoil dynamic stall [3], bluff body flow control [4][5][6][7][8], boundary layer flow control [9][10][11], highlift applications [12], and turbomachinery flow control [13][14][15], to name just a few. The physics surrounding the operation of SDBD plasma actuators has been the focus of several studies [16][17][18][19] and the mechanism of actuation is now fairly well understood.…”

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confidence: 99%

Optimization of Dielectric Barrier Discharge Plasma Actuators for Active Aerodynamic Flow Control

et al. 2009

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This paper presents the results of a parametric experimental investigation aimed at optimizing the body force produced by single dielectric barrier discharge plasma actuators used for aerodynamic flow control. A primary goal of the study is the improvement of actuator authority for flow control applications at higher Reynolds number than previously possible. The study examines the effects of dielectric material and thickness, applied voltage amplitude and frequency, voltage waveform, exposed electrode geometry, covered electrode width, and multiple actuator arrays. The metric used to evaluate the performance of the actuator in each case is the measured actuator-induced thrust which is proportional to the total body force. It is demonstrated that actuators constructed with thick dielectric material of low dielectric constant produce a body force that is an order of magnitude larger than that obtained by the Kapton-based actuators used in many previous plasma flow control studies. These actuators allow operation at much higher applied voltages without the formation of discrete streamers which lead to body force saturation.Nomenclature b = electrode serration width E = electric field f = body force Gr = Grashof number h = electrode serration height Re = Reynolds number T = actuator-induced thrust U j = wall jet velocity V pp = peak-to-peak voltage V rms = root-mean-square voltage x = streamwise spatial coordinate y = wall-normal spatial coordinate " = dielectric constant = fluid density c = charge density

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confidence: 99%

Optimization of Dielectric Barrier Discharge Plasma Actuators for Active Aerodynamic Flow Control

et al. 2009

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“…Of course, this is true for electrons, but the case of ions is still the subject of discussion among researchers. Font et al, (2004Font et al, ( , 2005 suggested that in the first half cycle, where the electrons are emitted from the upper electrode and positive ions are absorbed to this electrode, the net force is not zero and because of the dominance of ions, is directed towards the upper electrode. In the second half cycle the direction of the electric field is reversed.…”

Section: Fig 2 Illustration Of the Electron Drift That Dictates Pormentioning

confidence: 99%

“…The plasma actuator is one of the newest methods of EHD active flow control which is used for more than a decade. This actuator has various applications including separation control on airfoil leading edge Benard et al, 2008), control of airfoil dynamic stall (Pose et al, 2006), flow control in bluff bodies (Do et al, 2007;Thomas et al, 2005;Corke et al ,2008;Rizzetta et al, 2008;Gregory et al, 2008), boundary layer flow control (Schatzman et al, 2008;Baughn et al, 2006;Font et al, 2006), high lift-applications and turbo-machinery flow control (Huang et al, 2006a(Huang et al, , 2006bVan Ness et al, 2006). So far, to our knowledge, the AC-DBD methods are preferred to the DC-corona wind actuators in boundary layer flow control over a smooth and flat plate.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of “Why an AC Dielectric Barrier Discharge Plasma Actuator is Preferred to DC 2 Corona Wind Actuator in Boundary Layer Flow Control?

Tathiri

Esmaeilzadeh²,

Mirsajedi³

et al. 2014

JAFM

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In this paper, characteristics of the flow induced in the boundary layer by an AC-Dielectric Barrier Discharge (DBD) plasma actuator are compared against those of a DC-corona wind actuator. This is achieved by visualization of the induced flow using smoke injection and measuring the horizontal induced velocity. Our measurements show that the maximum induced velocity of an AC-DBD actuator is about one order of magnitude larger than that of a DC-corona actuator. For an AC-DBD actuator, the induced velocity is maximized on the plate surface while for a DC-corona actuator the induced velocity peaks at about 20mm above the surface. Using flow visualization, we demonstrate that the induced velocity of an AC-DBD actuator is parallel to the surface, while the induced velocity of a DC-corona actuator has components perpendicular to surface.

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“…Particle-in-cell direct simulation Monte Carlo (PIC-DSMC) is a specific type of DSMC approach that utilizes a self-consistent PIC method [38] to evaluate the electric field when it is altered by the presence of charged particles [39]. The PIC-DSMC method has been employed by Font [40] to investigate the performance and active mechanisms in dielectric barrier discharge (DBD) plasma actuators. Font et al [41] also incorporated the results of the PIC-DSMC model into a continuum-scale model of the Navier-Stokes equations in order to predict flow evolution resulting from the forces extracted from the PIC-DSMC simulation.…”

Section: Overviewmentioning

confidence: 99%

Direct simulation of ionization and ion transport for planar microscale ion generation devices

Fisher²,

Garimella³

2009

J. Phys. D: Appl. Phys.

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The theoretical performance of a planar microscale ion generation device is analyzed using the direct simulation Monte Carlo (DSMC) technique. The discrete motion and interactions of electrons and ions are modeled for atmospheric air as represented by N 2 and O 2 . The ionization threshold of the device in air is found to be 70 V because of the effects of molecular excitations that reduce the energy of the free electrons and the nature of the collision cross-sections. Additionally, microscale planar ionization devices are revealed to be inherently inefficient because of the loss of electrons and ions to the dielectric boundary. A multiscale simulation of the electrohydrodynamics is also conducted by extracting the ion-neutral interactions from the DSMC calculations and integrating them into a continuum-scale fluid dynamics model. The multiscale simulations show that the ion-neutral body force distribution for the planar devices is concentrated on the face of the cathode and therefore limits the impact of the force on the flow. A scale analysis confirms that the body force distribution is insufficient to induce high flow rates at this scale.

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Boundary Layer Control with Atmospheric Plasma Discharges

Cited by 83 publications

References 18 publications

Optimization of Dielectric Barrier Discharge Plasma Actuators for Active Aerodynamic Flow Control

Optimization of Dielectric Barrier Discharge Plasma Actuators for Active Aerodynamic Flow Control

Experimental Investigation of “Why an AC Dielectric Barrier Discharge Plasma Actuator is Preferred to DC 2 Corona Wind Actuator in Boundary Layer Flow Control?

Direct simulation of ionization and ion transport for planar microscale ion generation devices

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