Experimental investigation of filamentary and non-filamentary regimes in a surface dielectric barrier plasma actuator

Biganzoli, I; Barni, R; Gurioli, A; Pertile, R; Riccardi, C.

doi:10.1088/1742-6596/550/1/012038

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Since the rise in temperature near the edge of the exposed electrode is highest, it can be used as a method to characterize discharge uniformity of the actuator. [24,25] Thus, the sur-…”

Section: Plasma Images and Thermal Characteristicsmentioning

confidence: 99%

Comparison between AlN and Al ₂ O ₃ ceramics applied to barrier dielectric of plasma actuator

Bian¹,

Wu²,

Jia³

et al. 2017

Chinese Phys. B

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This paper reports the material characterization and performance evaluation of an AlN ceramic based dielectric barrier discharge (DBD) plasma actuator. A conventional Al 2 O 3 ceramic is also investigated as a control. The plasma images, thermal characteristics and electrical properties of the two actuators are compared and studied. Then, with the same electrical operating parameters (12-kV applied voltage and 11-kHz power frequency), variations of the surface morphologies, consumed power and induced velocities are recorded and analyzed. The experimental results show that the AlN actuator can produce a more uniform discharge while the discharge of the Al 2 O 3 actuator is easier to become filamentary. The later condition leads to higher power consumption and earlier failure due to electrode oxidation. In the plasma process, the power increment of the AlN actuator is higher than that of the Al 2 O 3 actuator. The induced velocity is also influenced by this process. Prior to aging, the maximum induced velocity of the AlN actuator is 4.2 m/s, which is about 40% higher than that of the Al 2 O 3 actuator. After 120-min plasma aging, the maximum velocity of the aged AlN actuator decreases by 27.8% while the Al 2 O 3 actuator registers a decrease of 25%.

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“…Since the rise in temperature near the edge of the exposed electrode is highest, it can be used as a method to characterize discharge uniformity of the actuator. [24,25] Thus, the sur-…”

Section: Plasma Images and Thermal Characteristicsmentioning

confidence: 99%

Comparison between AlN and Al ₂ O ₃ ceramics applied to barrier dielectric of plasma actuator

Bian¹,

Wu²,

Jia³

et al. 2017

Chinese Phys. B

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“…The two strokes are composed of a relatively large number of individual events, carrying electrical currents in the discharge area, for which the expression microdischarge was coined [6]. It is still not clear yet what the role played by FS and BS microdischarges is in the production of the induced airflow around the plasma [22,28,29].…”

Section: Introductionmentioning

confidence: 99%

Current Filaments in Asymmetric Surface Dielectric Barrier Discharge

et al. 2021

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In this study, we examine the statistical properties of asymmetric surface dielectric barrier discharges (SDBD) produced by applying a periodic high voltage between two conducting displaced electrodes, located at the opposite sides of a flat dielectric panel. Here, the asymmetry refers to the fact that the lower electrode is fully covered with an insulating material, while the upper one, glued onto the dielectric surface, is otherwise left exposed to the air. Such a configuration allows the formation of a thin layer of plasma above the insulating surface. A single cycle signal consists of two well-separated half-cycle patterns, denoted as forward and backward strokes, corresponding to positive and negative voltages, respectively. They display a quite complex discharge pattern constituted by a sequence of individual peaks (bursts) of varying current and time duration. Specifically, we find that backward stroke bursts carry a positive mean charge Q≃0.3 nC and mean current I≃35 mA, with a mean duration τ≃15 ns, while forward stroke bursts have a negative mean charge Q≃−0.1 nC, a mean current I≃−20 mA, and a mean duration τ≃11 ns. The statistical analysis suggests that power injection can be tailored to produce the active agents in the plasma needed for a particular application. We also determined discharge spatial correlation patterns from measurements of the associated stimulated optical emission. The optical excitations occur as a result of the ionizing effect of the electromagnetic waves which ignite the discharge, followed by the electric current flow. In particular, we point out that one of the phases of the discharge is compatible with a cathode directed streamer phenomenon (backward stroke), while the mechanism acting for a forward stroke has a different structure.

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Active Flow Control of a Flame-Holder Wake Using Nanosecond-Pulsed Surface-Dielectric-Barrier Discharge in a Low-Pressure Environment

et al. 2022

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Flame holders are widely used in ramjet combustors. We propose using surface nanosecond-pulsed surface-dielectric-barrier-discharge (NS-DBD) to manipulate the flame-holder flow field experimentally. The electrical characteristics, induced flow performance, and temperature distribution of NS-DBD were investigated via the electrical and optical measurement system. In the filamentary discharge mode, the discharge energy rose with decrease of the ambient pressure. The discharge pattern of NS-DBD changed from filamentous to uniform around 5 kPa. Starting-vortex intensity and jet-flow angle relative to the wall increased at low pressure. The recirculation zone was asymmetrical at pressures above 60 kPa. The recirculation zone’s area and length were smaller at lower pressures, but when the actuator was operating, the recirculation zone was nearly 11.8% longer. The vorticity increased with pressure. When the pulse width was 300 ns, the actuator had the greatest effect, and the low velocity region (LVR) area and the fuel–air-mixture residence time (FMRT) could be increased by 31.8% and 20.5%, respectively. The actuator had a smaller widening effect on the LVR area at lower pressure. Rising-edge time should increase with pressure to optimize LVR increase; it should be above 300 ns to optimize FMRT increase. We conclude that NS-DBD is a viable method of controlling flame-holder airflow at low pressure.

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Experimental investigation of filamentary and non-filamentary regimes in a surface dielectric barrier plasma actuator

Cited by 3 publications

References 11 publications

Comparison between AlN and Al ₂ O ₃ ceramics applied to barrier dielectric of plasma actuator

Comparison between AlN and Al ₂ O ₃ ceramics applied to barrier dielectric of plasma actuator

Current Filaments in Asymmetric Surface Dielectric Barrier Discharge

Active Flow Control of a Flame-Holder Wake Using Nanosecond-Pulsed Surface-Dielectric-Barrier Discharge in a Low-Pressure Environment

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Experimental investigation of filamentary and non-filamentary regimes in a surface dielectric barrier plasma actuator

Cited by 3 publications

References 11 publications

Comparison between AlN and Al 2 O 3 ceramics applied to barrier dielectric of plasma actuator

Comparison between AlN and Al 2 O 3 ceramics applied to barrier dielectric of plasma actuator

Current Filaments in Asymmetric Surface Dielectric Barrier Discharge

Active Flow Control of a Flame-Holder Wake Using Nanosecond-Pulsed Surface-Dielectric-Barrier Discharge in a Low-Pressure Environment

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Product

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Comparison between AlN and Al ₂ O ₃ ceramics applied to barrier dielectric of plasma actuator

Comparison between AlN and Al ₂ O ₃ ceramics applied to barrier dielectric of plasma actuator