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Plasma Assisted Low Temperature Combustion

Published on Jan 1, 2016in Plasma Chemistry and Plasma Processing2.768
· DOI :10.1007/S11090-015-9657-2
Yiguang Ju60
Estimated H-index: 60
(Princeton University),
Joseph K. Lefkowitz9
Estimated H-index: 9
(Princeton University)
+ 6 AuthorsQi Chen4
Estimated H-index: 4
(Beijing Jiaotong University)
Sources
Abstract
This paper presents recent kinetic and flame studies in plasma assisted low temperature combustion. First, the kinetic pathways of plasma chemistry to enhance low temperature fuel oxidation are discussed. The impacts of plasma chemistry on fuel oxidation pathways at low temperature conditions, substantially enhancing ignition and flame stabilization, are analyzed base on the ignition and extinction S-curve. Secondly, plasma assisted low temperature ignition, direct ignition to flame transition, diffusion cool flames, and premixed cool flames are demonstrated experimentally by using dimethyl ether and n-heptane as fuels. The results show that non-equilibrium plasma is an effective way to accelerate low temperature ignition and fuel oxidation, thus enabling the establishment of stable cool flames at atmospheric pressure. Finally, the experiments from both a non-equilibrium plasma reactor and a photolysis reactor are discussed, in which the direct measurements of intermediate species during the low temperature oxidations of methane/methanol and ethylene are performed, allowing the investigation of modified kinetic pathways by plasma-combustion chemistry interactions. Finally, the validity of kinetic mechanisms for plasma assisted low temperature combustion is investigated. Technical challenges for future research in plasma assisted low temperature combustion are then summarized.
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  • References (38)
  • Citations (53)
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References38
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#1Yiguang Ju (Princeton University)H-Index: 60
#2Christopher B. Reuter (Princeton University)H-Index: 9
Last. Sang Hee Won (Princeton University)H-Index: 30
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Abstract The formation and dynamics of premixed cool flames are numerically investigated by using a detailed kinetic mechanism of dimethyl ether mixtures in both freely-propagating and stretched counterflow flames with and without ozone sensitization. The present study focuses on the dynamics and transitions between cool flames and high temperature flames. The impacts of mixture temperature, inert gas temperature, and ozone concentration on low temperature ignition, cool flame formation, and fla...
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#1Igor V. Adamovich (OSU: Ohio State University)H-Index: 47
#2Ting Li (OSU: Ohio State University)H-Index: 4
Last. Walter R. Lempert (OSU: Ohio State University)H-Index: 32
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This work describes the kinetic mechanism of coupled molecular energy transfer and chemical reactions in low-temperature air, H2–air and hydrocarbon–air plasmas sustained by nanosecond pulse discharges (single-pulse or repetitive pulse burst). The model incorporates electron impact processes, state-specific N2 vibrational energy transfer, reactions of excited electronic species of N2, O2, N and O, and ‘conventional’ chemical reactions (Konnov mechanism). Effects of diffusion and conduction heat ...
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#1Joseph K. Lefkowitz (Princeton University)H-Index: 9
#2Peng Guo (Princeton University)H-Index: 2
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Speciation and temperature measurements of methane oxidation during a nanosecond repetitively pulsed discharge in a low-temperature flow reactor have been performed. Measurements of temperature and formaldehyde during a burst of pulses were made on a time-dependent basis using tunable diode laser absorption spectroscopy, and measurements of all other major stable species were made downstream of a continuously pulsed discharge using gas chromatography. The major species for a stoichiometric metha...
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#1Joseph K. Lefkowitz (Princeton University)H-Index: 9
#2Peng Guo (Princeton University)H-Index: 2
Last. Yiguang Ju (Princeton University)H-Index: 60
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Abstract A nanosecond repetitively pulsed (NRP) discharge in the spark regime has been investigated as to its effectiveness in reducing ignition time, both in a flow tube and a pulsed detonation engine (PDE). The flame-development time for methane–air mixtures in the flow tube is found to be a function of the total ignition energy and the pulse repetition frequency. Schlieren imaging revealed that at low pulse-repetition frequency (0–5 kHz), ignition kernels formed by the discharge are each tran...
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#1Yiguang Ju (Princeton University)H-Index: 60
#2Wenting Sun (Georgia Institute of Technology)H-Index: 23
Plasma assisted combustion is a promising technology to improve engine performance, increase lean burn flame stability, reduce emissions, and enhance low temperature fuel oxidation and processing. Over the last decade, significant progress has been made towards the applications of plasma in engines and the understanding of the fundamental chemistry and dynamic processes in plasma assisted combustion via the synergetic efforts in advanced diagnostics, combustion chemistry, flame theory, and kinet...
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It has been first shown by modelling that the discharge does not suppress but stimulates the development and increases the intensity of cool flame. It sharply reduces the delay time of cool flame ignition (isothermal stage) by more than 2 orders of magnitude and diminishes the total induction time by more than 1 order of magnitude due to radicals resulting from dissociation of fuel and oxygen molecules by electron impact. Under the discharge impact, the negative temperature coefficient (NTC) of ...
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Abstract In situ measurements by mid-IR laser absorption spectroscopy of C 2 H 4 /Ar dissociation and C 2 H 4 /O 2 /Ar oxidation activated by a nanosecond repetitively pulsed plasma have been conducted in a low temperature flow reactor (below 500 K) at a pressure of 60 Torr for both a continuously pulsed plasma discharge mode and a burst mode with 150 pulses. The measurements of the in situ diagnostics are validated and complemented by gas chromatography in the continuous discharge mode. A recen...
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Abstract A novel method to establish self-sustaining cool diffusion flames with well-defined boundary conditions is experimentally demonstrated by adding ozone to the oxidizer stream in counterflow configuration. It is found that the atomic oxygen produced through the decomposition of ozone dramatically shortens the induction timescale of the low temperature chemistry, extending the flammable region of cool flames. Thus, it enables the establishment of self-sustaining cool flames at the pressure...
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The key challenges to quantitative insight into fuel–air plasma kinetics, as well as plasma-assisted ignition and flameholding, are identified and assessed based on the results of recent experimental and kinetic modeling studies. Experimental and modeling approaches to address these critical issues are discussed. The results have major implications for the fundamental understanding of pulsed electric discharge dynamics, molecular energy transfer in reacting flows, plasma chemical reactions, and ...
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This research work was sponsored by the King Abdullah University of Science and Technology (KAUST), the Knut and Alice Wallenberg Foundation, the European Research Council (ERC), the Swedish Research Council (VR) and the Swedish Energy Agency through the Centre for Combustion Science and Technology (CECOST).
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