Branching characteristics of positive streamers in nitrogen-oxygen gas mixtures

Chen, She; Wang, Feng; Sun, Qiuqin; Zeng, Rong

doi:10.1109/tdei.2018.007043

Cited by 21 publications

(25 citation statements)

References 26 publications

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“…The streamer branching ratio D/d was determined as 15. Chen et al [120] found similar branching angles in nitrogen, but larger angles (53°±14°) in artificial air. The branching ratio they found was 13 for air and 7 for nitrogen.…”

Section: Experimental Results For Positive Streamer In Airmentioning

confidence: 81%

The physics of streamer discharge phenomena

Nijdam,

Teunissen,

Ebert

2020

Preprint

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In this review we describe a transient type of gas discharge which is commonly called a streamer discharge, as well as a few related phenomena in pulsed discharges. Streamers are propagating ionization fronts with self-organized field enhancement at their tips that can appear in gases at (or close to) atmospheric pressure. They are the precursors of other discharges like sparks and lightning, but they also occur in for example corona reactors or plasma jets which are used for a variety of plasma chemical purposes. When enough space is available, streamers can also form at much lower pressures, like in the case of sprite discharges high up in the atmosphere.We explain the structure and basic underlying physics of streamer discharges, and how they scale with gas density. We discuss the chemistry and applications of streamers, and describe their two main stages in detail: inception and propagation. We also look at some other topics, like interaction with flow and heat, related pulsed discharges, and electron runaway and high energy radiation. Finally, we discuss streamer simulations and diagnostics in quite some detail.This review is written with two purposes in mind: First, we describe recent results on the physics of streamer discharges, with a focus on the work performed in our groups. We also describe recent developments in diagnostics and simulations of streamers. Second, we provide background information on the above-mentioned aspects of streamers. This review can therefore be used as a tutorial by researchers starting to work in the field of streamer physics.

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Section: Experimental Results For Positive Streamer In Airmentioning

confidence: 81%

The physics of streamer discharge phenomena

Nijdam,

Teunissen,

Ebert

2020

Preprint

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“…The properties of streamers are determined by the electron dynamics which, in turn, are governed by gas-specific photoionization and swarm parameters. There are numerous investigations on streamers in different gases which illustrate this gas-dependency, for example: CO 2 [5], N 2 :CH 4 [6], air with artificially increased electron attachment or reduced photoionization [7,8] and N 2 -O 2 mixtures in various ratios [9,10].…”

Section: Streamer Dynamics In Varying Gasesmentioning

confidence: 99%

“…This quantity is defined analogously to equation (10) but with V total = V (ε dep > 10 −2 kJ/m 3 ). In other words we normalize with respect to the volume treated by the discharge, which is taken as the volume where the deposited energy density exceeds 10 −2 kJ/m 3 .…”

Section: Deposited Energy Densitymentioning

confidence: 99%

3D particle simulations of positive air-methane streamers for combustion

Bouwman,

Teunissen,

Ebert

2022

Preprint

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Streamer discharges can be used as a primary source of reactive species for plasma-assisted combustion. In this research we investigate positive streamers in a stoichiometric air-methane mixture with a three-dimensional particle-in-cell model for the electrons. We first discuss suitable electron scattering cross sections and an extension of the photoionization mechanism to air-methane mixtures. We show that the addition of 9.5% methane largely suppresses photoionization and shortens the photon mean free path. This leads to (1) accelerated streamer branching, (2) higher electric field enhancement at the streamer head, (3) lower internal electric fields, and (4) higher electron densities in the streamer channel. We also calculate the time-integrated energy density deposited during the evolution of positive streamers in background electric fields of 12.5 and 20 kV/cm. We find typical values of the deposited energy density in the range 0.5 − 2.5 kJ/m 3 within the ionized interior of streamers with a length of 5 mm; this value is rather independent of the electric fields applied here. Finally we find that the energy deposited in the inelastic electron scattering processes mainly produces reactive nitrogen species: N 2 triplet states and N, but also O and H radicals. The production of H 2 and O 2 singlet states also occurs albeit less pronounced.

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“…In recent years, advanced sensing, data storage, and communication have extensively promoted and developed imaging techniques [6,7]. Researchers have already carried out optical imaging studies of gas discharges using imaging instruments such as intensified charge-coupled device (ICCD) cameras and streak cameras [8][9][10][11][12][13]. The literature [8] used the ICCD camera to count the branching angle, cross-sectional area, and other parameters of the channels under high-purity nitrogen and artificial air conditions and then studied the branching characteristics of positive streamers in different nitrogen-oxygen mixtures.…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have already carried out optical imaging studies of gas discharges using imaging instruments such as intensified charge-coupled device (ICCD) cameras and streak cameras [8][9][10][11][12][13]. The literature [8] used the ICCD camera to count the branching angle, cross-sectional area, and other parameters of the channels under high-purity nitrogen and artificial air conditions and then studied the branching characteristics of positive streamers in different nitrogen-oxygen mixtures. The literature [9] used the ICCD camera to record time-resolved images of the Trichel pulses in the negative corona and analysed the morphology against the current signal to investigate the formation of the Trichel pulses.…”

Section: Introductionmentioning

confidence: 99%