Long-lived plasmoids generated by surface microwave discharges in chemically active gases

Berezhetskaya, N. K.; Gritsinin, S. I.; Kop’ev, V. A.; Коссый, И. А.; Wie, David Van

doi:10.1134/1.2101976

Cited by 9 publications

(21 citation statements)

References 4 publications

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“…The combustion was initiated by localized high-power discharges in which energy was released in small volumes as compared with a chamber volume. These include laser sparks, which are excited on the surface of solid target [1], direct laser heating in the focal spot [2], microwave discharges [3,4] and highcurrent slipping surface discharges [5][6][7]. In [8], the first results on a laser spark freely localized in a reactor chamber and working as a combustion igniter were presented.…”

Section: Introductionmentioning

confidence: 99%

“…The cylindrical quartz reactor chamber (1) of diameter D ∼ = 5 cm and length L ∼ = 25 cm is evacuated to a pressure p ≤ 0.1 Torr and filled with a stoichiometric CH 4 : O 2 mixture at a pressure of 135 ≤ p ≤ 180 Torr. The chamber is closed at the sides with flanges, one with a metallic blank flange and the other with a quartz window to input a powerful chemical (HF) laser radiation [17].…”

Section: Experimental Layout and Diagnostics Techniquesmentioning

confidence: 99%

“…In [1,3,6,8], this initial stage was called 'incomplete combustion '. In experiments with laser sparks and microwave discharges [1][2][3]8], we observed the formation of a wave of weak, relatively uniform 'blue' radiation preceding the volume combustion that appears as a bright burst throughout the reactor volume when the chemical energy in the branching chain reactions is converted almost entirely into heat and the equilibrium temperature is attained in the combusted gas mixture.…”

Section: Introductionmentioning

confidence: 99%

“…In some papers (e.g. [1][2][3][4][5][6]), these objects are called 'long-lived plasmoids'. In other investigations, brightly glowing long-lived objects that run away from the location of the energy release (their place of origin) are termed 'plasma bullets', 'plasma plumes' or 'plasma balls' [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…The intent of this work was to find information (in addition to that presented in [1][2][3][4][5][6][7][8]) about the structure and dynamics of the formation of flames initiated by powerful discharges excited in a local small area of a reactor chamber as well as to acquire results on the role of chemi-ionization processes in the ignition of combustion and in the parameters of a developed flame.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fast combustion waves and chemi-ionization processes in a flame initiated by a powerful local plasma source in a closed reactor

Артемьев

Berezhetskaya

Kazantsev

et al. 2015

Phil. Trans. R. Soc. A.

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Section: Introductionmentioning

confidence: 99%

Section: Experimental Layout and Diagnostics Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fast combustion waves and chemi-ionization processes in a flame initiated by a powerful local plasma source in a closed reactor

Артемьев

Berezhetskaya

Kazantsev

et al. 2015

Phil. Trans. R. Soc. A.

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Characteristics of plasma induced by interaction of a free-oscillated laser pulse with a coal target in air and combustible gas

Yang

Peng

2010

International Journal of Hydrogen Energy

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Free-oscillated Nd:YAG laser Laser ignition Radical spectrumHydrogen-oxygen mixture a b s t r a c t Plasma in the air is successfully induced by a free-oscillated Nd:YAG laser pulse with a peak power of 10 2-3 W. The initial free electrons for the cascade breakdown process are from the ablated particles from the surface of a heated coal target, likewise induced by the focused laser beam. The laser field compensates the energy loss of the plasma when the corresponding temperature and the images are investigated by fitting the experimental spectra of B 2 P þ / X 2 P þ band of CN radicals in the plasma with the simulated spectra and a 4-frame CCD camera. The electron density is estimated using a simplified Kramer formula. As this interaction occurs in a gas mixture of hydrogen and oxygen, the formation and development of the plasma are weakened or restrained due to the chaining branch reaction in which the OH radicals are accumulated and the laser energy is consumed.Moreover, this laser ignition will initiate the combustion or explosion process of combustible gas and the minimum ignition energy is measured at different initial pressures. The differences in the experimental results compared to those induced by a nanosecond Q-switched laser pulse with a peak power of 10 6-8 W are also discussed.

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Microwave diagnostics of pulsed atmospheric discharge with electrolytic electrode and long‐lived luminous formation in its afterglow

Zhao,

Lyu,

Astafiev

et al. 2023

High Voltage

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The Gatchina discharge phenomenon holds significant promise as a laboratory model for simulating ball lightning. However, crucial aspects concerning the plasma components of the resulting afterglow remain unresolved. Notably, the measurement of the electron density, a critical parameter, has not been fully achieved thus far. In this study, microwave diagnostics and video recording were employed during a pulsed Gatchina discharge, along with synchronous measurement of discharge current and voltage. Distinct antennas were positioned at different heights to enable separate diagnosis of the discharge and the ensuing long‐lived afterglow. The findings revealed that during the active phase of the Gatchina discharge, the plasma density was substantial enough to cause reflection of an electromagnetic wave with a frequency of 20 GHz from this highly conductive object. In the afterglow, the signal experienced only a moderate weakening of 10–20 percent, facilitating the determination of the time dependence of average electron density during the afterglow's passage between the two antennas. These measurements verified the unusually slow plasma decay in the afterglow of the Gatchina discharge, suggesting the potential significance of chemi‐ionisation processes involving long‐lived (metastable) particles.

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Long-lived plasmoids generated by surface microwave discharges in chemically active gases

Cited by 9 publications

References 4 publications

Fast combustion waves and chemi-ionization processes in a flame initiated by a powerful local plasma source in a closed reactor

Fast combustion waves and chemi-ionization processes in a flame initiated by a powerful local plasma source in a closed reactor

Characteristics of plasma induced by interaction of a free-oscillated laser pulse with a coal target in air and combustible gas

Microwave diagnostics of pulsed atmospheric discharge with electrolytic electrode and long‐lived luminous formation in its afterglow

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