Internal Microstructure of Current Channel of the Long Spark Discharge

Medvedev, Mikhail; Parkevich, E. V.; Огинов, А. В.; Zakharov, S. M.; Baidin, I. S.

doi:10.3103/s1068335621120034

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…This fact illustrates the universality of the phenomenon of discharge microstructuring, which, apparently, is associated with the basic laws of the course of gasdischarge processes. In this connection, based on the presence of microstructure in relatively long (up to 60 cm) spark channels of laboratory discharges [17], the results of the present work indicate the possibility of microstructure in more large-scale phenomena of atmospheric electricity, such as lightning, because the range of pressures studied here corresponds to the interval of heights where they are realized. Note, that the possibility of microstructuring of the lightning channel was pointed out earlier in works [17][18][19].…”

Section: Resultssupporting

confidence: 56%

Microchannel structure of a spark discharge in a pin to plane " gap at different air pressures

et al. 2022

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Using high-speed photography and shadow photography, the structure of the glow and the microstructure of the spark discharge in a 1.5 mm long "pin(cathode)-plane" gap in air in the pressure range from 300 to 760 Torr has been studied. The presence of a microchannel structure of the discharge in the indicated pressure range was established --- the discharge is a aggregation of a large number of micron-diameter channels. It is shown that with decreasing pressure, the evolution of the microstructure and glow of the discharge lags behind the onset of breakdown, however, their morphology retains similarity at different pressures Keywords: spark discharge, microstructure, method of shadow photography, high-speed shooting.

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Section: Resultssupporting

confidence: 56%

Microchannel structure of a spark discharge in a pin to plane " gap at different air pressures

et al. 2022

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“…It is found that the gas temperature drops during the dark period, which verifies the theoretical predications in [24,25]. Recently, Medvedev adopted shear interferometry to obtain the microstructure of long spark discharge channels, but the gas temperature data have not been reported [26].…”

Section: Introductionsupporting

confidence: 72%

Temperature measurements of long sparks in air using time-resolved moiré deflectometry

Cheng¹,

He²,

Luo³

et al. 2022

J. Phys. D: Appl. Phys.

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This paper presents an original investigation on a time-resolved moiré deflectometry for gas temperature measurements of long sparks in air. In order to perform a rigorous comparative investigation with the widely used quantitative schlieren method, we set up an orthogonal optical measurement system. The impacts of spatial resolution and exposure time on the measurement accuracy are investigated by comparing the measured radial distribution of the gas temperature and its time evolution during the same spark discharge event. It is found that the time-resolved moiré deflectometry with an exposure time of 1.0 μs can accurately measure the gas temperature evolution during the isobaric heating and relaxation process of long sparks. The measured results of the expansion rate of cross-section π·〖R_"g" 〗^2 and average temperature Tg confirms that the energy loss is dominated by thermal conduction during isobaric heating and relaxation process after the extinction of discharge current. The moiré deflectometry can achieve a finer spatial resolution than the quantitative schlieren method, which is beneficial to the reconstruction of steep radial temperature distribution and the suppression of measured temperature fluctuation. Moreover, the moiré deflectometry can obtain a sub-microsecond exposure time by increasing the power of continuous-wave laser source, which shows its potential to capture the rapid changes in gas temperature during the fast-heating process.

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Time Parameters of Ionizing Radiation of Anodic and Cathodic Localization in the Megavolt Atmospheric Discharge

Родионов

Агафонов

Ryabov

et al. 2022

Bull. Lebedev Phys. Inst.

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Internal Microstructure of Current Channel of the Long Spark Discharge

Cited by 3 publications

References 7 publications

Microchannel structure of a spark discharge in a pin to plane " gap at different air pressures

Microchannel structure of a spark discharge in a pin to plane " gap at different air pressures

Temperature measurements of long sparks in air using time-resolved moiré deflectometry

Time Parameters of Ionizing Radiation of Anodic and Cathodic Localization in the Megavolt Atmospheric Discharge

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Internal Microstructure of Current Channel of the Long Spark Discharge

Cited by 3 publications

References 7 publications

Microchannel structure of a spark discharge in a pin to plane &quot; gap at different air pressures

Microchannel structure of a spark discharge in a pin to plane &quot; gap at different air pressures

Temperature measurements of long sparks in air using time-resolved moiré deflectometry

Time Parameters of Ionizing Radiation of Anodic and Cathodic Localization in the Megavolt Atmospheric Discharge

Contact Info

Product

Resources

About

Microchannel structure of a spark discharge in a pin to plane " gap at different air pressures

Microchannel structure of a spark discharge in a pin to plane " gap at different air pressures