Boundary Layer Control with Atmospheric Plasma Discharges

Font, Gabriel

doi:10.2514/6.2004-3574

Cited by 29 publications

(10 citation statements)

References 16 publications

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“…This poses a challenge on diagnostics and their access to the boundary layer, as well as highlights the importance of the material properties and geographical feature of the wall. It is worth noting that the importance of boundary layer in low-temperature atmospheric plasmas has been reported in their effects on self-organization [58], surface modification of diamond and textile materials [59] [60], and plasma actuation [61]. It should also be mentioned that boundary-layer physics in near room-temperature atmospheric plasmas are very different from that in atmospheric-pressure arcs [62].…”

Section: Discussionmentioning

confidence: 99%

Wall fluxes of reactive oxygen species of an rf atmospheric-pressure plasma and their dependence on sheath dynamics

Liu¹,

Yang²,

Wang³

et al. 2012

J. Phys. D: Appl. Phys.

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A radio-frequency (rf) atmospheric-pressure discharge in He-O 2 mixture is studied using a fluid model for its wall fluxes and their dependence on electron and chemical kinetics in the sheath region. It is shown that ground-state O, O 2 + and O -are the dominant wall fluxes of neutral species, cations and anions, respectively. Detailed analysis of particle transport shows that wall fluxes are supplied from a boundary layer of 3 -300 µm immediately next to an electrode, a fraction of the thickness of the sheath region. The width of the boundary layer mirrors the effective excursion distance during lifetime of plasma species, and is a result of much reduced length scale of particle transport at elevated gas pressure. As a result, plasma species supplying their wall fluxes are produced locally within the boundary layer and the chemical composition of the overall wall flux depends critically on spatiotemporal characteristics of electron temperature and density within the sheath. Wall fluxes of cations and ions are found to consist of a train of nanosecond pulses, whereas wall fluxes of neutral species are largely time-invariant.

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Section: Discussionmentioning

confidence: 99%

Wall fluxes of reactive oxygen species of an rf atmospheric-pressure plasma and their dependence on sheath dynamics

Liu¹,

Yang²,

Wang³

et al. 2012

J. Phys. D: Appl. Phys.

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“…An alternating voltage is applied across the electrodes resulting in the generation of plasma in the vicinity of the electrodes. The voltage difference applied between the electrodes can vary from 1 kV to as high as 5 kV, and the frequency of the driving voltage is typically from 1 to 10 kHz 7,8 . The underlying physics, in terms of the plasma morphology and the geometric effects, of DBD plasma actuator was described by Enloe et al 9,10 .…”

Section: Introductionmentioning

confidence: 99%

Control of Separated Flow on a NACA 0015 Airfoil using Three-Dimensional Plasma Actuator

Wong

et al. 2014

7th AIAA Flow Control Conference

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Experimental study has been conducted to determine the effect of a three-dimensional plasma actuator, whose exposed and encapsulated electrodes geometry are designed with serrated configuration, on a NACA 0015 airfoil for flow separation control. The electrodes of the serrated configuration were arranged in a manner that the sawtooth are opposite to each other and horizontally separated by a dielectric material, hence the electrode gap is modified along the spanwise direction. In order to understand the characteristics of the threedimensional flow originated from the plasma actuator, measurements including the vorticity, longitudinal velocity and induced flow angle generated by the serrated configuration, were conducted in the absence of free air-stream using PIV technique. The mechanisms of vorticity generation for the plasma actuator are discussed. Lift and drag measurements on the airfoil were conducted at low Reynolds number (77 × × × × 10 3 ). The plasma actuator showed effective control authority by generating both the streamwise flow and the spanwise-periodic vorticity, and it was found to lead to stall delay by 5° and increase in lift coefficient by about 6%. Nomenclatureheight of the sawtooth U ∞ = freestream velocity V p = applied voltage w = width of the sawtooth x = streamwise direction y = lateral direction z = spanwise direction α = angle-of-attack ω = vorticity 1 Associate Professor, Institute of Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School,

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“…Further details can be found in ref. [15][16]. The cross sections used to determine collisional probabilities can be found in ref.…”

Section: Numerical Modelmentioning

confidence: 99%

Recent Progress in Dielectric Barrier Discharges for Aerodynamic Flow Control

Font¹,

Morgan

2007

Contrib. Plasma Phys.

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Plasma actuators are electrical devices that use an atmospheric pressure dielectric barrier discharge for flow control. They have been employed successfully to promote boundary layer attachment. Simulations have been carried out of a plasma actuator using Direct-Simulation-Monte-Carlo and Particle-in-Cell methods. This work summarizes some recent results including: 1) the method by which force is imparted by the actuator to the neutral flow, 2) the effect of electronegative gasses, such as oxygen, and 3) the effects on the neutral flow of the plasma force.

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Boundary Layer Control with Atmospheric Plasma Discharges

Cited by 29 publications

References 16 publications

Wall fluxes of reactive oxygen species of an rf atmospheric-pressure plasma and their dependence on sheath dynamics

Wall fluxes of reactive oxygen species of an rf atmospheric-pressure plasma and their dependence on sheath dynamics

Control of Separated Flow on a NACA 0015 Airfoil using Three-Dimensional Plasma Actuator

Recent Progress in Dielectric Barrier Discharges for Aerodynamic Flow Control

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