The streamer-to-spark transition in a transient spark: a dc-driven nanosecond-pulsed discharge in atmospheric air

Janda, M.; Machala, Zdenko; Niklová, Adriana; Martišovitš, V.

doi:10.1088/0963-0252/21/4/045006

Cited by 105 publications

(111 citation statements)

References 50 publications

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“…The streamer propagation velocity, channel diameter and branching were measured by CCD or ICCD camera [5][6][7][8][9]. The streamer current, charge, and streamer head potential were studied using Rogowski coil or sampling resistance [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of streamer propagation along the insulation surface: influence of dielectric material

Meng

Mei

Changlong

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Research on dynamics of streamer propagation along different dielectric materials under a uniform electric field is presented. In the three-electrode arrangement, the variation of the streamer propagation probability, velocity and light intensity with electric field in the air and along the different dielectric materials was measured through three photomultipliers. The photographs of the streamer propagation in the air and along the different dielectric materials were taken with an ultraviolet camera. The test results have shown that the electric field required for streamer propagation in air alone is less than along the insulation surface. Furthermore, for electric fields higher than streamer 'stability' propagation fields, the streamer propagates along insulation surface with a 'fast' and a 'slow' component. However, the streamer propagates in air alone without a 'fast' component, only with a 'slow' component. The velocity of the streamer propagating in air alone is significantly less than the velocity of the 'fast' component, and is higher than the velocity of the 'slow' component. The streamer 'stability' propagation field and velocity depend upon the nature of the dielectric material. Specifically, higher electric fields are required for streamers to propagate along a dielectric material with larger permittivity. The velocity of streamer propagation along the dielectric material is also affected by attachment of charge to the surface and photoemission of secondary electrons from the surface so much. Consequently, under the same electric field, the relationship between streamer propagation velocity and permittivity of dielectric material is not very evident, roughly inverse proportion.Index Terms -Streamer propagation, dielectric material, three-electrode arrangement, streamer propagation electric field, streamer propagation velocity, streamer propagation light intensity.

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Section: Introductionmentioning

confidence: 99%

Characteristics of streamer propagation along the insulation surface: influence of dielectric material

Meng

Mei

Changlong

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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“…We observed significant shortening of the streamer-to-spark transition time τ [15], [16]. Above ∼3 kHz, τ decreased from a few microseconds down to ∼100 ns.…”

Section: Transient Sparkmentioning

confidence: 72%

“…Actually, we experimentally observed that the streamer-tospark transition in TS is probably governed by the heating of the gas inside the plasma channel up to ∼1000 K [16]. However, besides the hydrodynamic expansion, the increase in T g to 1000 K may also have a direct effect on the gas phase chemistry [49].…”

Section: B Streamer-to-spark Transition Phasementioning

confidence: 91%

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Study of Transient Spark Discharge Properties Using Kinetic Modeling

Dvonč

Janda

2015

IEEE Trans. Plasma Sci.

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The kinetic model simulating plasma chemistry induced by Transient Spark (TS) discharge in air is presented in this paper. TS is a dc-driven self-pulsing discharge of streamer-to-spark transition type. The presented kinetic model defines the temporal evolution of reduced electric field strength E/N, gas temperature, and density of neutrals N during the evolution of TS discharge, so that calculated electron density is in agreement with experimental results. We studied the mechanism of the streamer-to-spark transition and breakdown in TS using this model. We assume that the breakdown mechanism in TS is based on the gas density decrease and can be summarized as follows: heating of the channel → increase in the pressure → hydrodynamic expansion → decrease in N in the core of the channel → increase in E/N → acceleration of ionization processes. However, this mechanism is influenced by species accumulated due to previous TS pulses at higher TS repetition frequencies. Sensitivity analysis focused on major electron loss and production processes indicates an important role of the amount of O 2 dissociated by the previous pulses. A lower density of O 2 means a lower rate of electron attachment, while accumulated atomic oxygen atoms lead to acceleration of electron detachment processes. Index Terms-Breakdown, kinetic model, transient spark (TS).

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“…At the same time, the physics studies in the literature on spark discharges running at atmospheric pressure concentrate on fields like gas treatment and plasma assisted combustion. [11][12][13][14][15] These applications require short and medium intensity current pulses (<100 ns, some tens of amps, respectively) in order to achieve an efficient and rapid release of heat and radicals while avoiding damage to the electrodes. As opposed to this, NP generation in an SDG aims for electrode erosion, thus requires long duration, high intensity current pulses (ca.…”

Section: Introductionmentioning

confidence: 99%

A time-resolved imaging and electrical study on a high current atmospheric pressure spark discharge

Palomares

Kohut

Galbács

et al. 2015

Journal of Applied Physics

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A time-resolved laser induced fluorescence study on the ion velocity distribution function in a Hall thruster after a fast current disruption Phys. Plasmas 16, 043504 (2009) We present a time-resolved imaging and electrical study of an atmospheric pressure spark discharge. The conditions of the present study are those used for nanoparticle generation in spark discharge generator setups. The oscillatory bipolar spark discharge was generated between two identical Cu electrodes in different configurations (cylindrical flat-end or tipped-end geometries, electrode gap from 0.5 to 4 mm), in a controlled co-axial N 2 flow, and was supplied by a high voltage capacitor. Imaging data with nanosecond time resolution were collected using an intensified CCD camera. This data were used to study the time evolution of plasma morphology, total light emission intensity, and the rate of plasma expansion. High voltage and high current probes were employed to collect electrical data about the discharge. The electrical data recorded allowed, among others, the calculation of the equivalent resistance and inductance of the circuit, estimations for the energy dissipated in the spark gap. By combining imaging and electrical data, observations could be made about the correlation of the evolution of total emitted light and the dissipated power. It was also observed that the distribution of light emission of the plasma in the spark gap is uneven, as it exhibits a "hot spot" with an oscillating position in the axial direction, in correlation with the high voltage waveform. The initial expansion rate of the cylindrical plasma front was found to be supersonic; thus, the discharge releases a strong shockwave. Finally, the results on equivalent resistance and channel expansion are comparable to those of unipolar arcs. This shows the spark discharge has a similar behavior to the arc regime during the conductive phase and until the current oscillations stop. V C 2015 AIP Publishing LLC. [http://dx

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The streamer-to-spark transition in a transient spark: a dc-driven nanosecond-pulsed discharge in atmospheric air

Cited by 105 publications

References 50 publications

Characteristics of streamer propagation along the insulation surface: influence of dielectric material

Characteristics of streamer propagation along the insulation surface: influence of dielectric material

Study of Transient Spark Discharge Properties Using Kinetic Modeling

A time-resolved imaging and electrical study on a high current atmospheric pressure spark discharge

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