Elongating the area of plasma/fluid interaction of surface nanosecond pulsed discharges

Bayoda, Kossi D.; Bénard, Nicolas; Moreau, E.

doi:10.1016/j.elstat.2014.12.004

Cited by 29 publications

(12 citation statements)

References 30 publications

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“…However, recent investigations gave numerical and experimental evidences that the flow control authority shown by ns-DBD plasma actuator does not purely rely on the formation of the shockwave. Rather, the effect can be due to a combination of pressure, viscosity, and density gradients produced by the residual heat deposited within the discharge volume by the discharge 9,10,14 (same conclusion was reported 13 and later acknowledged 29 by others). In recent work by the authors, 9,10 evidence was given of the existence of a strong thermal effect due to nanosecond plasma actuation using Schlieren imaging.…”

Section: Introductionsupporting

confidence: 50%

Energy deposition characteristics of nanosecond dielectric barrier discharge plasma actuators: Influence of dielectric material

Correale

Winkel

Kotsonis

2015

Journal of Applied Physics

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An experimental study aimed at the characterization of energy deposition of nanosecond Dielectric Barrier Discharge (ns-DBD) plasma actuators was carried out. Special attention was given on the effect of the thickness and material used for dielectric barrier. The selected materials for this study were polyimide film (Kapton), polyamide based nylon (PA2200), and silicone rubber. Schlieren measurements were carried out in quiescent air conditions in order to observe density gradients induced by energy deposited. Size of heated area was used to qualify the energy deposition coupled with electrical power measurements performed using the backcurrent shunt technique. Additionally, light intensity measurements showed a different nature of discharge based upon the material used for barrier, for a fixed thickness and frequency of discharge. Finally, a characterisation study was performed for the three tested materials. Dielectric constant, volume resistivity, and thermal conductivity were measured. Strong trends between the control parameters and the energy deposited into the fluid during the discharge were observed. Results indicate that efficiency of energy deposition mechanism relative to the thickness of the barrier strongly depends upon the material used for the dielectric barrier itself. In general, a high dielectric strength and a low volumetric resistivity are preferred for a barrier, together with a high heat capacitance and a low thermal conductivity coefficient in order to maximize the efficiency of the thermal energy deposition induced by an ns-DBD plasma actuator.

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Section: Introductionsupporting

confidence: 50%

Energy deposition characteristics of nanosecond dielectric barrier discharge plasma actuators: Influence of dielectric material

Correale

Winkel

Kotsonis

2015

Journal of Applied Physics

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“…Pulsed streamer discharge has been widely used for many applications, such as airflow control related to the rapid energy release through dissociation reactions and quenching reactions [1][2][3][4], and pollutant control related to the decomposition of pollutant molecules by reactive species [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies of primary and secondary streamers in a pulsed surface dielectric barrier discharge

Peng

Jiang

Yao

et al. 2019

J. Phys. D: Appl. Phys.

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Generation and propagation of the primary and secondary streamers, initiated by a positive pulsed surface dielectric barrier discharge under different pulse amplitude and different dielectric permittivity, are studied via experimental and numerical simulation. Species (positive ions, negative ions and oxygen atoms) generation and distribution in the primary and secondary streamers are discussed. Experimental and numerical results are qualitatively coincident in discharge morphology, voltage-current characteristics and deposited energy. From visual forms of the discharge, both the primary and secondary streamers are initiated from the edge of the high-voltage (HV) electrode and propagate along the dielectric barrier surface. However, the numerical results show that the primary streamer is not completely attached to the dielectric barrier surface, and the distance between the primary streamer head and the surface is the largest, which is about several microns. Moreover, the secondary streamer starts about tens of microns away from the HV electrode edge. Furthermore, when the secondary streamer occurs, the trailing phenomenon of the primary streamer can still be observed, which is sustained by the accumulated positive charge.

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“…Therefore, over a few years, a new electrode geometry based on three electrodes was perfected, first for the case of AC-DBD [35][36][37][38] and more recently for the case of NS-DBD. For the latter case, gas ionization is realized as usual with a pulsed voltage while the drift of the ionized species is promoted by a DC negative voltage applied to a second air-exposed electrode; this is the nanosecond sliding discharge [25,[39][40][41]. However, this type of sliding discharge can also be produced without DC voltage if a sufficient pulsed voltage is applied [42,43].…”

Section: Introductionmentioning

confidence: 99%

Streamer propagation and pressure waves produced by a nanosecond pulsed surface sliding discharge: effect of the high-voltage electrode shape

Moreau¹,

Bayoda²,

Bénard³

2020

J. Phys. D: Appl. Phys.

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This paper aims at better understanding nanosecond sliding discharges based on a three-electrode geometry and at studying the effect of the shape of the pulsed high-voltage electrode on their electrical, optical and mechanical properties. Three different electrode shapes are considered: a typical planar electrode with a straight edge, a planar electrode with a sawtooth edge, and a wire electrode. First, we verified that the sliding discharge starts to appear when the potential difference between both air-exposed electrodes exceeds about 25 kV, corresponding to a mean electric strength (potential difference divided by the gap) a little bit higher than 6 kV cm−1, but this value differs slightly depending on the shape of the electrode. Secondly, we highlighted that the current with the wire-based discharge is slightly higher compared to the two others because the streamers are more numerous and they are more uniformly distributed along the wire. Moreover, whatever the electrode shape, intensified charge-coupled device visualizations showed that many streamers initiate from the pulsed high-voltage electrode edge and propagate on the dielectric surface toward the DC voltage electrode at a mean velocity of about 1 mm ns−1. However, the streamer trajectory depends strongly on the electrode shape. Visualizations of the pressure waves induced by the different plasma actuators have been realized with a shadowgraph system. In the presence of a sliding discharge, every streamer is at the origin of three different pressure waves. The first hemispherical pressure wave results from streamer ignition at the edge of the pulsed high-voltage electrode, the head of the streamer acting as a point heat source. The second hemispherical pressure wave is due to the corona-type discharge that ignites from the negative DC high-voltage electrode when the streamer head gets closer. Finally, the third wave is a semi-cylindrical wave as each streamer acts as a line source of heat. To conclude, pressure measurements highlighted that the peak value of the pressure is nearly constant along the spanwise direction of the wire electrode as it presents high fluctuations with the sawtooth electrode, the maximum pressure being measured above the tips, where streamers are localized.

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Elongating the area of plasma/fluid interaction of surface nanosecond pulsed discharges

Cited by 29 publications

References 30 publications

Energy deposition characteristics of nanosecond dielectric barrier discharge plasma actuators: Influence of dielectric material

Energy deposition characteristics of nanosecond dielectric barrier discharge plasma actuators: Influence of dielectric material

Experimental and numerical studies of primary and secondary streamers in a pulsed surface dielectric barrier discharge

Streamer propagation and pressure waves produced by a nanosecond pulsed surface sliding discharge: effect of the high-voltage electrode shape

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