Diffusive-thermal instabilities in premixed flames: Stepwise ignition-temperature kinetics

Irina Brailovsky; Peter V. Gordon; Leonid Kagan; Gregory Sivashinsky

doi:10.1016/j.combustflame.2015.01.006

Diffusive-thermal instabilities in premixed flames: Stepwise ignition-temperature kinetics

Irina Brailovsky, Peter V. Gordon, Leonid Kagan, Gregory Sivashinsky^*

^*Corresponding author for this work

School of Mathematical Sciences

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

22 Scopus citations

Abstract

This study is motivated by the observation that in combustion of hydrogen-oxygen/air and ethylene-oxygen mixtures the global activation energy appears to be high at low enough temperatures and low at high enough temperatures, reflecting the complex nature of the underlying chemistry. Stability analysis of a uniformly propagating planar premixed flame controlled by a stepwise ignition-temperature kinetics (representing the activation energy temperature-dependence) is carried out. It is shown that, for all its schematic nature, the diffusive-thermal model based on the ignition-temperature kinetics reproduces quite successfully the basic features of both cellular and pulsating instabilities typical of low and high Lewis number mixtures.

Original language	English
Pages (from-to)	2077-2086
Number of pages	10
Journal	Combustion and Flame
Volume	162
Issue number	5
DOIs	https://doi.org/10.1016/j.combustflame.2015.01.006
State	Published - 1 May 2015

Funding

Funders	Funder number
Simons Foundation	317882
United States-Israel Binational Science Foundation	2012-057
Israel Science Foundation	335/13

Keywords

Cellular flames
Diffusive-thermal instabilities in flames
Pattern formation in reaction-diffusion systems
Pulsating flames

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10.1016/j.combustflame.2015.01.006

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title = "Diffusive-thermal instabilities in premixed flames: Stepwise ignition-temperature kinetics",

abstract = "This study is motivated by the observation that in combustion of hydrogen-oxygen/air and ethylene-oxygen mixtures the global activation energy appears to be high at low enough temperatures and low at high enough temperatures, reflecting the complex nature of the underlying chemistry. Stability analysis of a uniformly propagating planar premixed flame controlled by a stepwise ignition-temperature kinetics (representing the activation energy temperature-dependence) is carried out. It is shown that, for all its schematic nature, the diffusive-thermal model based on the ignition-temperature kinetics reproduces quite successfully the basic features of both cellular and pulsating instabilities typical of low and high Lewis number mixtures.",

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author = "Irina Brailovsky and Gordon, {Peter V.} and Leonid Kagan and Gregory Sivashinsky",

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AU - Brailovsky, Irina

AU - Gordon, Peter V.

AU - Kagan, Leonid

AU - Sivashinsky, Gregory

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Y1 - 2015/5/1

N2 - This study is motivated by the observation that in combustion of hydrogen-oxygen/air and ethylene-oxygen mixtures the global activation energy appears to be high at low enough temperatures and low at high enough temperatures, reflecting the complex nature of the underlying chemistry. Stability analysis of a uniformly propagating planar premixed flame controlled by a stepwise ignition-temperature kinetics (representing the activation energy temperature-dependence) is carried out. It is shown that, for all its schematic nature, the diffusive-thermal model based on the ignition-temperature kinetics reproduces quite successfully the basic features of both cellular and pulsating instabilities typical of low and high Lewis number mixtures.

AB - This study is motivated by the observation that in combustion of hydrogen-oxygen/air and ethylene-oxygen mixtures the global activation energy appears to be high at low enough temperatures and low at high enough temperatures, reflecting the complex nature of the underlying chemistry. Stability analysis of a uniformly propagating planar premixed flame controlled by a stepwise ignition-temperature kinetics (representing the activation energy temperature-dependence) is carried out. It is shown that, for all its schematic nature, the diffusive-thermal model based on the ignition-temperature kinetics reproduces quite successfully the basic features of both cellular and pulsating instabilities typical of low and high Lewis number mixtures.

KW - Cellular flames

KW - Diffusive-thermal instabilities in flames

KW - Pattern formation in reaction-diffusion systems

KW - Pulsating flames

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JO - Combustion and Flame

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Diffusive-thermal instabilities in premixed flames: Stepwise ignition-temperature kinetics

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