‘Gas-dynamic diode’: Streamer interaction with sharp density gradients

Starikovskiy, Andrey; Aleksandrov, N. L.

doi:10.1088/1361-6595/ab3c0a

Cited by 11 publications

(24 citation statements)

References 29 publications

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“…The properties of a streamer change during its development because (i) the increasing voltage drop across the streamer channel leads to a decrease in the potential of the streamer head, (ii) the local electric field increases when the streamer head approaches the opposite electrode, and (iii) the amount of seed electrons produced by photoionization is accumulated in the discharge gap. The third effect is of particular importance when a streamer propagates through the media with density discontinuities [26,30,31].…”

Section: Modeling Resultsmentioning

confidence: 99%

How pulse polarity and photoionization control streamer discharge development in long air gaps

Starikovskiy

Aleksandrov

2020

Plasma Sources Sci. Technol.

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A 2D approach is used to simulate the properties of positive and negative streamers emerging from a high-voltage electrode in a long (14 cm) air gap for standard pressure and temperature. The applied voltage varies from 100 to 500 kV. To reveal the influence of photoionization, the calculations are made for various rates of seed electron generation in front of the streamer head. The difference between the properties of positive and negative streamers is associated with the different directions of the electron drift ahead of the streamer head. As a result, the peak electric field at the streamer head and the streamer velocity are higher for positive voltage polarity. The average electric field in the negative streamer channel is approximately twice that in the positive streamer channel, in agreement with available measurements in long air gaps. It is shown that photoionization in front of the streamer head is important not only for the development of strong positive discharges, but for the development of strong negative discharges as well. An increase in the photoionization rate increases the propagation velocity of the positive streamer and retards the propagation of the negative streamer.

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Section: Modeling Resultsmentioning

confidence: 99%

How pulse polarity and photoionization control streamer discharge development in long air gaps

Starikovskiy

Aleksandrov

2020

Plasma Sources Sci. Technol.

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“…An early example is that bubbles in liquids or in high pressure air can influence streamer path and branching, when they are of similar size as the streamer diameter [140,141]. A hydrodynamic shock front where the gas density is changing suddenly, can have a similar effect [142]. That localized regions with higher pre-ionization can change the discharge dynamics, was already discussed above; here the streamer can not only be guided by laser induced pre-ionization, but it also shows particular branching structures when entering or leaving a pre-ionised region [119,122], see also figure 21.…”

Section: Streamer Branching In Other Gases and Background-mentioning

confidence: 99%

The physics of streamer discharge phenomena

Nijdam

Teunissen

Ebert

2020

Plasma Sources Sci. Technol.

291

266

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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 atmospheric air, or more generally in gases over distances larger than order 1 cm times N 0 /N, where N is gas density and N 0 is gas density under ambient conditions. Streamers 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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“…fluid model [32][33][34][35][36][37]. The system of equations under study consisted of the transport equations for the densities of charged particles (electrons and positive and negative ions) and Poisson's equation for the electric field.…”

Section: Streamer Initiation and Propagation Was Simulated On The Bas...mentioning

confidence: 99%

Streamer Self-Focusing in External Longitudinal Magnetic Field

Starikovskiy

Shneider

Aleksandrov

2021

2021 IEEE International Conference on Plasma Science (ICOPS)

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The numerical simulation of the development of a streamer discharge in a gap with an external longitudinal magnetic field was used to demonstrate the self-focusing of such discharges. Selffocusing is caused by a sharp deceleration of the radial ionization wave due to a change in the electron energy distribution function, a decrease in the average electron energy, the rate of gas ionization and the electron mobility in crossed electric and magnetic fields as compared to the case of the discharge development without a magnetic field. The self-focusing effect of a streamer discharge in an external longitudinal magnetic field is observed for both positive and negative pulse polarities. The paper proposes an estimate of the critical value of the magnetic field, which makes it possible to control the development of pulsed high-voltage discharges at various gas pressures.

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‘Gas-dynamic diode’: Streamer interaction with sharp density gradients

Cited by 11 publications

References 29 publications

How pulse polarity and photoionization control streamer discharge development in long air gaps

How pulse polarity and photoionization control streamer discharge development in long air gaps

The physics of streamer discharge phenomena

Streamer Self-Focusing in External Longitudinal Magnetic Field

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