Journal ArticleDOI
Space and time analysis of the nanosecond scale discharges in atmospheric pressure air: II. Energy transfers during the post-discharge
TLDR
In this paper, a spatiotemporal description of the gas number densities of major species including O atoms, the hydrodynamic expansion and the relative distribution of the energy deposited in the specific molecular modes of N2(X) and O2 (X) following a nanosecond pulsed air discharge at atmospheric pressure is presented.Abstract:
The better understanding of nanosecond scale discharges under atmospheric pressure and the validation of plasmachemical models, require an increasing need for reliable data. This paper presents, in the first time to our knowledge, spatiotemporal description of the gas number densities of major species including O atoms, the hydrodynamic expansion and the relative distribution of the energy deposited in the specific molecular modes of N2(X) and O2(X) following a nanosecond pulsed air discharge at atmospheric pressure. These data are obtained from phase-locked average profiles of the ground states of N2 and O2 probed by spontaneous Raman scattering. The results complete part I of this investigation dedicated to the gas temperature and the vibrational distribution function of N2 and O2 and show that half of the total energy deposited is loaded on the vibrational mode (48% for N2 and 2% for O2). The energy released into fast gas heating represents 19% of the energy deposited. This fast gas heating (up to 1000 K) observed in tens of nanoseconds after the current rise leads to a shock wave propagation shown with the pressure measurements. These processes combined with vibration–vibration/translation energy transfers and convective transports induced by the shock wave propagation are spatiotemporally studied. The experimental data of this study provide space and time database for the validation of plasmachemical models of nanosecond pulsed discharges in atmospheric pressure air.read more
Citations
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Journal ArticleDOI
Dynamics of near-surface electric discharges and mechanisms of their interaction with the airflow
Journal ArticleDOI
Dynamics of energy coupling and thermalization in barrier discharges over dielectric and weakly conducting surfaces on µs to ms time scales
TL;DR: In this paper, the authors analyzed discharge development and energy coupling in a surface dielectric barrier discharge (SDBD), atmospheric air plasmas over weakly conducting surfaces, over a wide range of time scales and electrical conductivities.
Journal ArticleDOI
Space and time analysis of the nanosecond scale discharges in atmospheric pressure air: I. Gas temperature and vibrational distribution function of N 2 and O 2
TL;DR: In this article, the gas temperature and the vibrational excitation of N2 and O2 in their ground electronic state during the post-discharge of an overvoltage nanosecond-pulsed discharge generated in a pin-to-plane gap of air at atmospheric pressure were investigated.
Journal ArticleDOI
Pulsed nanosecond discharge in air at high specific deposited energy: fast gas heating and active particle production
Journal ArticleDOI
Energy balance in nanosecond pulse discharges in nitrogen and air
Ivan Shkurenkov,Igor Adamovich +1 more
TL;DR: In this paper, a kinetic model is used to analyze energy partition and energy transfer in nanosecond pulse discharges sustained between two spherical electrodes in nitrogen and air, and the model shows good agreement with experimental data, reproducing experimental discharge current pulse waveforms, as well as dominant processes of energy transfer.
References
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TL;DR: In this paper, a review of applications of nonequilibrium plasma for the problems of plasma assisted ignition and plasma-assisted combustion has been observed and historical references highlighting pioneering works in the area are presented.
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Plasma-assisted ignition and combustion
TL;DR: The use of a thermal equilibrium plasma for combustion control dates back more than a hundred years to the advent of internal combustion (IC) engines and spark ignition systems and the same principles are still applied today to achieve high efficiency in various applications as mentioned in this paper.
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Introduction to Active Thermochemical Tables: Several “Key” Enthalpies of Formation Revisited†
Branko Ruscic,Reinhardt Pinzón,Melita L. Morton,Gregor Von Laszevski,Sandra Bittner,Sandeep Nijsure,Kaizar Amin,Michael Minkoff,Albert F. Wagner +8 more
TL;DR: Active thermochemical tables (ATcT) as discussed by the authors uses a statistical analysis of thermochemically relevant determinations that define the thermochemical table, made possible by redundant measurements and alternate network pathways.
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SDBD plasma actuator with nanosecond pulse-periodic discharge
TL;DR: In this article, the authors present a detailed explanation of the physical mechanism of the nanosecond pulsed surface dielectric barrier discharge (SDBD) effect on the flow and show that the resulting pulsed-periodic disturbance causes an efficient transversal momentum transfer into the boundary layer and further flow attachment to the airfoil surface.
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Plasma supported combustion
TL;DR: In this paper, the influence of gas excitation by a pulsed nanosecond discharge with a high-voltage pulse amplitude up to 25kV on the properties of a premixed propane-air flame has been investigated over a wide range of the equivalence ratios (0.4-5).