Glow-to-Spark Transitions in a Plasma System for Ignition and Combustion Control

Korolev, Yu. D.; Франц, О. Б.; Landl, N. V.; Geyman, V. G.; Matveev, Igor B.

doi:10.1109/tps.2007.910133

Cited by 50 publications

(46 citation statements)

References 8 publications

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“…The reason is that, when we increase the pressure, both the reduced electric field E br /p and the ratio V br /V st decrease. Such a behavior is associated with the fact that an average electric field in the gap approaches to a value of 2 MV/cm and the process of the field emission starts playing an important role in the discharge initiation [9]- [11].…”

Section: Experimental Arrangement and Obtained Datamentioning

confidence: 99%

“…We obtain such an equation due to simple manipulations. The relation for conductivity can be written as (11) so that substituting σ 1 into (10) gives us…”

Section: B Rompe-weitzel Modelmentioning

confidence: 99%

“…Decreasing the gap separation leads to increasing the electric field in the gap. Then, the field can reach such a high value that the process of the field emission becomes noticeable which does not allow increasing the breakdown voltage of the gap and the reduced electric field [1], [9]- [11]. Hence, in every case, the choice of the operating conditions for the gap is a challenging problem.…”

Section: Introductionmentioning

confidence: 99%

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High-Voltage Spark Gap in a Regime of Subnanosecond Switching

Korolev

Bykov

2012

IEEE Trans. Plasma Sci.

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This paper describes an investigation of a highvoltage spark gap in the conditions of subnanosecond switching. The high-voltage pulsed generator "Sinus" is used to charge a coaxial line loaded to a high-pressure spark gap. Typical charging time for the coaxial line is in a range from 1 to 2 ns, maximum charging voltage is up to 250 kV, and a range of pressures for the gap is from 2 to 9 MPa. The theoretical models of the switching process on subnanosecond time scale are examined. A general equation for temporal behavior of the gap voltage, which is applicable for the avalanche model and the Rompe-Weitzel model has been obtained. It is revealed that the approach based on the avalanche model offers a possibility to describe the switching process only at extremely high overvoltages. The Rompe-Weitzel model demonstrates a good agreement with the experimental data both for the conditions of static breakdown and for the regime of a high overvolted gap. Comparison of experimental and calculated voltage waveforms has made it possible to estimate an empirical constant in the Rompe-Weitzel model (the price of ionization). This constant is varied from 420 to 920 eV, depending on the initial electric field in the gap.Index Terms-High-pressure spark discharge, subnanosecond discharge, subnanosecond high-voltage generators.

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Section: Experimental Arrangement and Obtained Datamentioning

confidence: 99%

“…We obtain such an equation due to simple manipulations. The relation for conductivity can be written as (11) so that substituting σ 1 into (10) gives us…”

Section: B Rompe-weitzel Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-Voltage Spark Gap in a Regime of Subnanosecond Switching

Korolev

Bykov

2012

IEEE Trans. Plasma Sci.

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“…Detailed investigations of the nonsteady-state discharge behavior had been carried out in [13], [14], and [47]. It had been revealed that the spatial discharge structure includes in itself a plasma column of a glow-type discharge with an anode spot and a background weakly ionized plasma plume/jet, which appears due to vortex gas flow.…”

Section: Experimental Arrangement and The Conditions Of Dischargementioning

confidence: 99%

“…Then, in a nonparallel-plane electrode configuration, the length of the plasma column changes with time as the discharge-burning voltage also changes [13]- [16].…”

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confidence: 99%

Low-Current Plasmatron as a Source of Nitrogen Oxide Molecules

Korolev

Франц

Landl

et al. 2012

IEEE Trans. Plasma Sci.

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This paper describes a usage of a low-current coaxial plasmatron for generation of nitrogen oxide molecules. Glow-type discharge in vortex air flow is sustained at an average current from 0.05 to 0.2 A that corresponds to an average discharge power from 65 to 160 W. The diameter of an exit nozzle of the plasmatron is of 0.5 cm, and the air flow is varied from 0.2 to 1.5 g/s. In such conditions, the discharge burns in nonsteady-state regime, when a sustainment of a plasma jet/plume and a plasma column in the plasmatron nozzle is accompanied by the spontaneous glow-tospark transitions. Due to the special design of the anode nozzle, an efficient interaction of the air flow with the plasma plume and plasma column is provided. Typical contents of nitric monoxide in the output gas are of about several grams per cubic meter, and the cost for formation of one molecule is from 50 to 35 eV.

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