Searcharxiv⌕ Search

arXiv subjects

S. E. Emelin

Publications and source records attributed to S. E. Emelin.

10 recordsLinked to original sources
arXiv2008

Investigation of Space-Time Structure of the Discharge with an Electrolytic Anode and Face-Type, Air Half-Space Directed Cathode (Gatchina's Discharge)

Despite of its limited capabilities for ball-lightning modeling, the chemically active dust plasma of electric discharges is a very interesting physical object. Gatchina's discharge, which gives a possibility to study the dust-gas fireball, represents a complex non-stationary process, combining the creation and the destruction of relatively long-living high-enthalpy microscopic states with non-ideal dust plasma and with a gas-dynamic form, resulting in appearance of a spherical luminous object. In the present work we studied spatial structure of the discharge and its dynamics with the help of electric and optical measurements.

physics.plasm-ph↗
arXiv2008

Optical Spectra of the High Voltage Erosive Water Discharge

In the present paper kinetics of emission spectra of the high voltage erosive water discharge at near ultraviolet and visible spectral ranges has been investigated. Obtained results show a similarity of physical properties of this discharge (and of corresponding plasmoids) to that of some other types of erosional discharges which also result in the formation of dust-gas fireballs.

physics.plasm-ph↗
arXiv2006

Long-living plasmoids generation by high-voltage discharge through thin conducting layers

A new type of pulse high voltage electric discharge through a thin conducting layer on the surface of glass plate has been investigated. The afterglow plasma of this discharge forms quasi-spherical object with a lifetime about 0.2-0.3 s. Electric properties of the objects were studied by electric probe method. Measurements of plasma radiation spectra kinetics at visible and near ultraviolet spectral ranges have been carried out. Comparative analysis of the physical properties of the plasmoids appearing in this discharges and of ones generated via thin metal wires burning is given. Possible mechanism of the plasma metastability are discussed.

physics.plasm-ph↗
arXiv2006

The Dust-Gas Fireball as a Special Form of the Electric Erosive Discharge Afterglow

Main results of researches of the electric erosive discharge afterglow plasma, of the fireballs being formed by this plasma and having some particular but deep similarities to the ball lightning are given. The analysis of our results and results of some other authors has allowed to specify the nature of radiation and stability of the shape for a dust-gas chemical fireball, to make series of assumptions concerning the mechanism of these properties. The experimental results and considerations of the given work can be interesting for physics of plasma with different kinds of condensed state, for an ascertainment of the chemiluminescence mechanism of the flame, as well as for a bead lightning understanding and for improvement of ball lightning laboratory analogues.

physics.plasm-ph↗
arXiv2003

Conditions for non-stationary discharge initiation into "burning-through" mode

The special form of an electric discharge - "burn-through" in regard to the ball lightning problem has been considered. Having been carried out within closed volume, this mode of erosive discharge has shown the series of clear differences consisting in the high gas density, formation of the metal-polymer aerogel, the percolating current and unusual features of plasma's exhaust. The conditions for its stable origination and the main stages of the discharge process have been ascertained.

physics.plasm-ph↗
arXiv2003

Commutation of lightning impulse by multiarc erosive radial-slotted discharge

The non-stationary mode of radial-slotted erosive discharge was considered. The existence condition of the relatively steady multiarc regime has been found. Experimentally it has been shown that this discharge has been corresponding to the required condition at the sufficiently large current. The oscillograms of commutation of lightning impulse on the simulative test facility with the equivalent of a high-voltage transmission line are presented. The obtained results indicate the ability of erosive discharge, when using within the framework of the complex lightning protection facility, to fast commutation of lightning impulses at the level of rated current

physics.plasm-ph↗
arXiv2001

Physical conditions of the ball lightning ejection caused by interaction of electrical discharge with metal and polymer

Physical conditions of formation of the ball lightning with high energy density considered as condensate of heavily excited atoms have been studied. In our approach the ball lightning formation processes is considered as a form of energy-structure self-organi-zation on the base of metastable substance and interchange. We propose different variants of the experimental method to create autonomous formation on the base of the closed capillary discharge allowing to obtain the objects with the life time up to 2s which burn through the foil, explode and can penetrate through the polymer wall without destroying it.

physics.plasm-ph↗
arXiv2001

Erosive radially-slotted discharge in sheet current mode

New non-stationary non-contracted form of the erosive radially-slotted discharge as a thin round sheet with the current of the azimuth direction have been discovered, its existence beings stipulated by a radial transport-wave fluxes. Characteristic features of this discharge is self-confinement of the discharge current magnitude, corresponding decrease of the current pulse duration and occurrence of an energy and substance ejection with rather unusual properties. Measurements of kinetics of the discharge current, the plasma radiation intensity and an electrical probe signal, as well as the transmission electron microscope investigations of characteristic aerodisperse aggregates arising the erosive phase, have been carried out. The probe signal duration was about 10 times greater than that of the current; its kinetics was complicated suggesting existence in the slot of two components with fundamentally different properties and states of the substance.

physics.plasm-ph↗