Flame propagation enhancement by plasma excitation of oxygen. Part I: Effects of O3

T. Ombrello; Sang Hee Won; Yiguang Ju; S. Williams

doi:10.1016/j.combustflame.2010.02.005

Flame propagation enhancement by plasma excitation of oxygen. Part I: Effects of O₃

T. Ombrello, Sang Hee Won, Yiguang Ju, S. Williams

Research output: Contribution to journal › Article › peer-review

344 Scopus citations

Abstract

The thermal and kinetic effects of O₃ on flame propagation were investigated experimentally and numerically by using C₃H₈/O₂/N₂ laminar lifted flames. Ozone produced by a dielectric barrier plasma discharge was isolated and measured quantitatively by using absorption spectroscopy. Significant kinetic enhancement by O₃ was observed by comparing flame stabilization locations with and without O₃ production. Experiments at atmospheric pressures showed an 8% enhancement in the flame propagation speed for 1260ppm of O₃ addition to the O₂/N₂ oxidizer. Numerical simulations showed that the O₃ decomposition and reaction with H early in the pre-heat zone of the flame produced O and OH, respectively, from which the O reacted rapidly with C₃H₈ and produced additional OH. The subsequent reaction of OH with the fuel and fuel fragments, such as CH₂O, provided chemical heat release at lower temperatures to enhance the flame propagation speed. It was shown that the kinetic effect on flame propagation enhancement by O₃ reaching the pre-heat zone of the flame for early oxidation of fuel was much greater than that by the thermal effect from the energy contained within O₃. For non-premixed laminar lifted flames, the kinetic enhancement by O₃ also induced changes to the hydrodynamics at the flame front which provided additional enhancement of the flame propagation speed. The present results will have a direct impact on the development of detailed plasma-flame kinetic mechanisms and provided a foundation for the study of combustion enhancement by O₂(a¹Δ_g) in part II of this investigation.

Original language	English (US)
Pages (from-to)	1906-1915
Number of pages	10
Journal	Combustion and Flame
Volume	157
Issue number	10
DOIs	https://doi.org/10.1016/j.combustflame.2010.02.005
State	Published - Oct 2010

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Fuel Technology
Energy Engineering and Power Technology
General Physics and Astronomy

Keywords

Flame propagation enhancement
Flame speed enhancement
Lifted flame
Ozone
Plasma-assisted combustion
Tribrachial flame

Access to Document

10.1016/j.combustflame.2010.02.005

Cite this

@article{105c57cd68d3409bbdefafe29b172092,

title = "Flame propagation enhancement by plasma excitation of oxygen. Part I: Effects of O3",

abstract = "The thermal and kinetic effects of O3 on flame propagation were investigated experimentally and numerically by using C3H8/O2/N2 laminar lifted flames. Ozone produced by a dielectric barrier plasma discharge was isolated and measured quantitatively by using absorption spectroscopy. Significant kinetic enhancement by O3 was observed by comparing flame stabilization locations with and without O3 production. Experiments at atmospheric pressures showed an 8% enhancement in the flame propagation speed for 1260ppm of O3 addition to the O2/N2 oxidizer. Numerical simulations showed that the O3 decomposition and reaction with H early in the pre-heat zone of the flame produced O and OH, respectively, from which the O reacted rapidly with C3H8 and produced additional OH. The subsequent reaction of OH with the fuel and fuel fragments, such as CH2O, provided chemical heat release at lower temperatures to enhance the flame propagation speed. It was shown that the kinetic effect on flame propagation enhancement by O3 reaching the pre-heat zone of the flame for early oxidation of fuel was much greater than that by the thermal effect from the energy contained within O3. For non-premixed laminar lifted flames, the kinetic enhancement by O3 also induced changes to the hydrodynamics at the flame front which provided additional enhancement of the flame propagation speed. The present results will have a direct impact on the development of detailed plasma-flame kinetic mechanisms and provided a foundation for the study of combustion enhancement by O2(a1Δg) in part II of this investigation.",

keywords = "Flame propagation enhancement, Flame speed enhancement, Lifted flame, Ozone, Plasma-assisted combustion, Tribrachial flame",

author = "T. Ombrello and Won, {Sang Hee} and Yiguang Ju and S. Williams",

note = "Funding Information: This work was supported by the Air Force Office of Scientific Research with grant number FA9550-07-1-0136 and the AFOSR MURI research grant on plasma-assisted combustion under the technical monitor of program manager Dr. Julian Tishkoff. Part of the research was performed while the corresponding author held a National Research Council Research Associateship Award at the United States Air Force Research Laboratory, Wright-Patterson Air Force Base. The authors wish to thank Mr. Dmitry Opaits for his expertise and help with the ozone generation and Dr. Campbell Carter for insightful discussions.",

year = "2010",

month = oct,

doi = "10.1016/j.combustflame.2010.02.005",

language = "English (US)",

volume = "157",

pages = "1906--1915",

journal = "Combustion and Flame",

issn = "0010-2180",

publisher = "Elsevier Inc.",

number = "10",

}

TY - JOUR

T1 - Flame propagation enhancement by plasma excitation of oxygen. Part I

T2 - Effects of O3

AU - Ombrello, T.

AU - Won, Sang Hee

AU - Ju, Yiguang

AU - Williams, S.

N1 - Funding Information: This work was supported by the Air Force Office of Scientific Research with grant number FA9550-07-1-0136 and the AFOSR MURI research grant on plasma-assisted combustion under the technical monitor of program manager Dr. Julian Tishkoff. Part of the research was performed while the corresponding author held a National Research Council Research Associateship Award at the United States Air Force Research Laboratory, Wright-Patterson Air Force Base. The authors wish to thank Mr. Dmitry Opaits for his expertise and help with the ozone generation and Dr. Campbell Carter for insightful discussions.

PY - 2010/10

Y1 - 2010/10

N2 - The thermal and kinetic effects of O3 on flame propagation were investigated experimentally and numerically by using C3H8/O2/N2 laminar lifted flames. Ozone produced by a dielectric barrier plasma discharge was isolated and measured quantitatively by using absorption spectroscopy. Significant kinetic enhancement by O3 was observed by comparing flame stabilization locations with and without O3 production. Experiments at atmospheric pressures showed an 8% enhancement in the flame propagation speed for 1260ppm of O3 addition to the O2/N2 oxidizer. Numerical simulations showed that the O3 decomposition and reaction with H early in the pre-heat zone of the flame produced O and OH, respectively, from which the O reacted rapidly with C3H8 and produced additional OH. The subsequent reaction of OH with the fuel and fuel fragments, such as CH2O, provided chemical heat release at lower temperatures to enhance the flame propagation speed. It was shown that the kinetic effect on flame propagation enhancement by O3 reaching the pre-heat zone of the flame for early oxidation of fuel was much greater than that by the thermal effect from the energy contained within O3. For non-premixed laminar lifted flames, the kinetic enhancement by O3 also induced changes to the hydrodynamics at the flame front which provided additional enhancement of the flame propagation speed. The present results will have a direct impact on the development of detailed plasma-flame kinetic mechanisms and provided a foundation for the study of combustion enhancement by O2(a1Δg) in part II of this investigation.

AB - The thermal and kinetic effects of O3 on flame propagation were investigated experimentally and numerically by using C3H8/O2/N2 laminar lifted flames. Ozone produced by a dielectric barrier plasma discharge was isolated and measured quantitatively by using absorption spectroscopy. Significant kinetic enhancement by O3 was observed by comparing flame stabilization locations with and without O3 production. Experiments at atmospheric pressures showed an 8% enhancement in the flame propagation speed for 1260ppm of O3 addition to the O2/N2 oxidizer. Numerical simulations showed that the O3 decomposition and reaction with H early in the pre-heat zone of the flame produced O and OH, respectively, from which the O reacted rapidly with C3H8 and produced additional OH. The subsequent reaction of OH with the fuel and fuel fragments, such as CH2O, provided chemical heat release at lower temperatures to enhance the flame propagation speed. It was shown that the kinetic effect on flame propagation enhancement by O3 reaching the pre-heat zone of the flame for early oxidation of fuel was much greater than that by the thermal effect from the energy contained within O3. For non-premixed laminar lifted flames, the kinetic enhancement by O3 also induced changes to the hydrodynamics at the flame front which provided additional enhancement of the flame propagation speed. The present results will have a direct impact on the development of detailed plasma-flame kinetic mechanisms and provided a foundation for the study of combustion enhancement by O2(a1Δg) in part II of this investigation.

KW - Flame propagation enhancement

KW - Flame speed enhancement

KW - Lifted flame

KW - Ozone

KW - Plasma-assisted combustion

KW - Tribrachial flame

UR - http://www.scopus.com/inward/record.url?scp=77955773756&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77955773756&partnerID=8YFLogxK

U2 - 10.1016/j.combustflame.2010.02.005

DO - 10.1016/j.combustflame.2010.02.005

M3 - Article

AN - SCOPUS:77955773756

SN - 0010-2180

VL - 157

SP - 1906

EP - 1915

JO - Combustion and Flame

JF - Combustion and Flame

IS - 10

ER -