The role of non-thermal transient plasma for enhanced flame ignition in C2H4air
Identifieur interne : 000D10 ( Main/Exploration ); précédent : 000D09; suivant : 000D11The role of non-thermal transient plasma for enhanced flame ignition in C2H4air
Auteurs : D. Singleton [États-Unis] ; S J Pendleton [États-Unis] ; M A Gundersen [États-Unis]Source :
- Journal of Physics D: Applied Physics [ 0022-3727 ] ; 2011.
English descriptors
- Teeft :
- Active particles, Active species, Appl, Combustion process, Current signals, Different pulse generators, Electron impact dissociation, Emission spectrum, Excitation, Gate time, Gure, Ignition, Ignition delay, Ignition delay time, Ignition delays, Ignition sites, Phys, Plasma discharge, Porous cathode, Pulse, Pulse generator, Pulse width, Reaction rates, Room temperature, Same angle, Similar ignition delays, Single pulse, Southern california, Spectral measurements, Standard conditions, Streamer, Streamer channel, Streamer channels, Thermal processes, Time scale, Track communication, Transient, Transient plasma, Transient plasma discharge, Transient plasma ignition.
Abstract
Transient plasma ignition, involving short ignition pulses (typically 1050ns), has been shown to effectively reduce ignition delays and improve engine performance for a wide range of combustion-driven engines relative to conventional spark ignition. This methodology is therefore potentially useful for many engine applications; however, at present there is limited understanding of the underlying physics. Evidence is presented here for two distinct phases of the plasma-ignition process: an initial non-equilibrium plasma phase, wherein energetic electrons transfer energy into electronically excited species that accelerate reaction rates, and a spatially distributed thermal phase, that produces exothermic fuel oxidation reactions that result in ignition. It is shown that ignition kernels are formed at the ends of the spatially separated streamer channels, at the cathode and/or anode depending on the local electric field strength, and that the temperature in the streamer channel is close to room temperature up to 100ns after the discharge.
Url:
DOI: 10.1088/0022-3727/44/2/022001
Affiliations:
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Phys. D: Appl. Phys.</title><idno type="ISSN">0022-3727</idno><idno type="eISSN">1361-6463</idno><imprint><publisher>IOP Publishing</publisher><date type="published" when="2011">2011</date><biblScope unit="volume">44</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="1">1</biblScope><biblScope unit="page" to="6">6</biblScope><biblScope unit="production">Printed in the UK & the USA</biblScope></imprint><idno type="ISSN">0022-3727</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-3727</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="Teeft" xml:lang="en"><term>Active particles</term><term>Active species</term><term>Appl</term><term>Combustion process</term><term>Current signals</term><term>Different pulse generators</term><term>Electron impact dissociation</term><term>Emission spectrum</term><term>Excitation</term><term>Gate time</term><term>Gure</term><term>Ignition</term><term>Ignition delay</term><term>Ignition delay time</term><term>Ignition delays</term><term>Ignition sites</term><term>Phys</term><term>Plasma discharge</term><term>Porous cathode</term><term>Pulse</term><term>Pulse generator</term><term>Pulse width</term><term>Reaction rates</term><term>Room temperature</term><term>Same angle</term><term>Similar ignition delays</term><term>Single pulse</term><term>Southern california</term><term>Spectral measurements</term><term>Standard conditions</term><term>Streamer</term><term>Streamer channel</term><term>Streamer channels</term><term>Thermal processes</term><term>Time scale</term><term>Track communication</term><term>Transient</term><term>Transient plasma</term><term>Transient plasma discharge</term><term>Transient plasma ignition</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Transient plasma ignition, involving short ignition pulses (typically 1050ns), has been shown to effectively reduce ignition delays and improve engine performance for a wide range of combustion-driven engines relative to conventional spark ignition. This methodology is therefore potentially useful for many engine applications; however, at present there is limited understanding of the underlying physics. Evidence is presented here for two distinct phases of the plasma-ignition process: an initial non-equilibrium plasma phase, wherein energetic electrons transfer energy into electronically excited species that accelerate reaction rates, and a spatially distributed thermal phase, that produces exothermic fuel oxidation reactions that result in ignition. It is shown that ignition kernels are formed at the ends of the spatially separated streamer channels, at the cathode and/or anode depending on the local electric field strength, and that the temperature in the streamer channel is close to room temperature up to 100ns after the discharge.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Californie</li></region><settlement><li>Los Angeles</li></settlement><orgName><li>Université de Californie du Sud</li></orgName></list><tree><country name="États-Unis"><region name="Californie"><name sortKey="Singleton, D" sort="Singleton, D" uniqKey="Singleton D" first="D" last="Singleton">D. Singleton</name></region><name sortKey="Gundersen, M A" sort="Gundersen, M A" uniqKey="Gundersen M" first="M A" last="Gundersen">M A Gundersen</name><name sortKey="Gundersen, M A" sort="Gundersen, M A" uniqKey="Gundersen M" first="M A" last="Gundersen">M A Gundersen</name><name sortKey="Pendleton, S J" sort="Pendleton, S J" uniqKey="Pendleton S" first="S J" last="Pendleton">S J Pendleton</name><name sortKey="Singleton, D" sort="Singleton, D" uniqKey="Singleton D" first="D" last="Singleton">D. Singleton</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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