Electrostatic Instability of an AC-Driven Discharge in Dense Air

Auzas, F.; Makarov, M.; Puech, Vincent; Tardiveau, Pierre

doi:10.1109/tps.2008.924454

Cited by 3 publications

(5 citation statements)

References 3 publications

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“…The non-similarity of the photoionization mechanism involved in streamer propagation [34] and a heat confining inside the filaments due to non-similar heat diffusion [35] are both proposed to explain this discrepancy. This can be clearly and experimentally observed in a recent work on air/propane ignition by a non-equilibrium radiofrequency corona discharge up to 20 bar, which describes an amazing and unexpected twisting effect of the filaments above 4 bar that had never been observed at lower pressure [14]. For low pressures up to levels slightly above atmospheric pressure, similarity rules seem to remain valid.…”

Section: Introductionmentioning

confidence: 52%

“…While each of them is specific because of its geometry, the nature of the ignited medium or the electrical properties of the energy supply, they are all designed to efficiently control in amplitude, time and space the reduced electric field E/N, which is the key parameter of the development of the discharge and its reactivity. Actually, DBD reactors [12,13], transient spark systems [10], radiofrequency [14,15] or pulsed nanosecond scale discharges [4,7,9,11,16,17] are under investigation. Nanosecond scale discharges, as described in this study, are probably the most popular for ignition purposes and they are often investigated in corona configurations with a high voltage pulse applied to a sharp curvature radius electrode.…”

Section: Introductionmentioning

confidence: 99%

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Diffuse mode and diffuse-to-filamentary transition in a high pressure nanosecond scale corona discharge under high voltage

Tardiveau¹,

Moreau²,

Bentaleb³

et al. 2009

J. Phys. D: Appl. Phys.

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The dynamics of a point-to-plane corona discharge induced in high pressure air under nanosecond scale high overvoltage is investigated. The electrical and optical properties of the discharge can be described in space and time with fast and precise current measurements coupled to gated and intensified imaging. Under atmospheric pressure, the discharge exhibits a diffuse pattern like a multielectron avalanche propagating through a direct field ionization mechanism. The diffuse regime can exist since the voltage rise time is much shorter than the characteristic time of the field screening effects, and as long as the local field is higher than the critical ionization field in air. As one of these conditions is not fulfilled, the discharge turns into a multi-channel regime and the diffuse-to-filamentary transition strongly depends on the overvoltage, the point-to-plane gap length and the pressure. When pressure is increased above atmospheric pressure, the diffuse stage and its transition to streamers seem to satisfy similarity rules as the key parameter is the reduced critical ionization field only. However, above 3 bar, neither diffuse avalanche nor streamer filaments are observed but a kind of streamer–leader regime, due to the fact that mechanisms such as photoionization and heat diffusion are not similar to pressure.

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Section: Introductionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Diffuse mode and diffuse-to-filamentary transition in a high pressure nanosecond scale corona discharge under high voltage

Tardiveau¹,

Moreau²,

Bentaleb³

et al. 2009

J. Phys. D: Appl. Phys.

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“…A new intermediate plasma has been studied at the French car company Renault using high voltages at high frequencies. The obtained discharge works even above atmospheric pressure, shows large gas penetration and is efficient in triggering fuel combustion [52]. High voltage nanosecond repetitively pulsed discharges have also been used recently to efficiently stabilize lean turbulent flames [53].…”

Section: Other Plasmas In Airmentioning

confidence: 99%

Physics and applications of atmospheric non-thermal air plasma with reference to environment

Marode¹,

Djermoune²,

Dessante³

et al. 2009

Plasma Phys. Control. Fusion

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Since air is a natural part of our environment, special attention is given to the study of plasmas in air at atmospheric pressure and their applications. This fact promoted the study of electrical conduction in air-like mixtures, i.e. mixtures containing an electronegative gas component. If the ionization growth is not limited its temporal evolution leads to spark formation, i.e. a thermal plasma of several thousand kelvins in a quasi-local thermodynamic equilibrium state. But before reaching such a thermal state, a plasma sets up where the electrons increase their energy characterized by an electron temperature T e much higher than that of heavy species T or T + for the ions. Since the plasma is no longer characterized by only one temperature T , it is said to be in a nonthermal plasma (NTP) state. Practical ways are listed to prevent electron ionization from going beyond the NTP states. Much understanding of such NTP may be gathered from the study of the simple paradigmatic case of a discharge induced between a sharp positively stressed point electrode facing a grounded negative plane electrode. Some physical properties will be gathered from such configurations and links underlined between these properties and some associated applications, mostly environmental. Aerosol filtration and electrostatic precipitators, pollution control by removal of hazardous species contained in flue gas exhaust, sterilization applications for medical purposes and triggering fuel combustion in vehicle motors are among such applications nowadays.

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“…It can also explain why the discharge extends towards a limit and stabilizes inside the gap, the equilibrium being reached when the whole energy during one period is completely consumed inside the channels. This energy consumption is one of the key points of the RF corona discharge characteristics since it corresponds to the heating of the gas [12,13].…”

Section: Inception and Propagationmentioning

confidence: 99%

“…From that time, the whole structure starts to twist and to constrict around the point electrode. This effect has been attributed to electrostatic instabilities along the filaments, which induce local field enhancements and promote the start of tiny radial branches [15]. At high pressures, the whole extension of the plasma can be supposed to be controlled by the electrical power of the discharge and its dissipation into heating or other kinetics processes.…”

Section: Discharge Development and Energymentioning

confidence: 99%

Heating effects of a non-equilibrium RF corona discharge in atmospheric air

Auzas

Tardiveau

Puech

et al. 2010

J. Phys. D: Appl. Phys.

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Electrical and thermal properties of a single electrode configuration corona discharge generated under radiofrequency high voltage inside an open air gap at pressures above 1 bar is investigated. Time-resolved imaging of the discharge shows a four-step development of the discharge at atmospheric pressure starting by streamers' inception and propagation, evolving in heating waves and stabilizing in a stationary regime until the power supply is switched off. The mean gas temperature reaches about 1700 K in tens of microseconds with electrical energy release around tens of millijoules. Heating has been attributed to ion collisions and excited species relaxation, promoted by the successive time periods of the power supply. At higher pressures, beyond 3 bar, this behaviour changes and heating occurs at the same time as the discharge propagates. It leads to hot channels which constrict near the electrode as long as the voltage pulse is applied. Temperature gets higher and saturates at 2600 K whatever the voltage and the pressure. Considering the change in the electrical energy density released within the plasma channels with pressure and voltage, temperature saturation seems to be an effect of heat confining within the channels due to pressure. The large and non-thermal plasma generated by the RF corona discharge is a very good candidate for car engine lean mixtures ignition issues.

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Electrostatic Instability of an AC-Driven Discharge in Dense Air

Cited by 3 publications

References 3 publications

Diffuse mode and diffuse-to-filamentary transition in a high pressure nanosecond scale corona discharge under high voltage

Diffuse mode and diffuse-to-filamentary transition in a high pressure nanosecond scale corona discharge under high voltage

Physics and applications of atmospheric non-thermal air plasma with reference to environment

Heating effects of a non-equilibrium RF corona discharge in atmospheric air

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