Analysis of the asymptotic structure of stoichiometric premixed CH4-H2-air flames

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Abstract

The classical asymptotic theory describing the structure of stoichiometric methane–air flames, introduced by Peters and Williams, has been extended to describe the structure of stoichiometric methane–hydrogen–air flames. The theory predicts a decreasing inner-layer temperature, while the adiabatic flame temperature increases slightly with increasing amount of hydrogen in the fuel. These changes together lead to an increasing burning velocity as a function of the amount of hydrogen in the fuel mixture. The predicted variations are compared with numerical results; the burning velocity is also compared with experiments and the agreement is reasonable. To demonstrate in an independent way that the decrease in the inner-layer temperature dominates the change in flame structure and burning velocity, additional measurements of the influence of heat loss on the burning velocity of methane–hydrogen–air flames are carried out. The effective activation energy governing this behavior shows a decrease as a function of the amount of hydrogen, confirming the prediction of the theory that the inner-layer temperature decreases with increasing amount of hydrogen. The derived analytical expressions can be used to guide the adaption of combustion systems running on natural gas when hydrogen is added to the fuel.
LanguageEnglish
Pages1031-1038
JournalProceedings of the Combustion Institute
Volume31
Issue number1
DOIs
StatePublished - 2007

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Hydrogen
flames
air
hydrogen
Air
Methane
methane
Adiabatic flame temperature
flame temperature
natural gas
Heat losses
velocity measurement
Velocity measurement
Temperature
temperature
Natural gas
Activation energy
activation energy
heat
predictions

Cite this

@article{04a890bba6fd4be288b7d1b3d5e974e8,
title = "Analysis of the asymptotic structure of stoichiometric premixed CH4-H2-air flames",
abstract = "The classical asymptotic theory describing the structure of stoichiometric methane–air flames, introduced by Peters and Williams, has been extended to describe the structure of stoichiometric methane–hydrogen–air flames. The theory predicts a decreasing inner-layer temperature, while the adiabatic flame temperature increases slightly with increasing amount of hydrogen in the fuel. These changes together lead to an increasing burning velocity as a function of the amount of hydrogen in the fuel mixture. The predicted variations are compared with numerical results; the burning velocity is also compared with experiments and the agreement is reasonable. To demonstrate in an independent way that the decrease in the inner-layer temperature dominates the change in flame structure and burning velocity, additional measurements of the influence of heat loss on the burning velocity of methane–hydrogen–air flames are carried out. The effective activation energy governing this behavior shows a decrease as a function of the amount of hydrogen, confirming the prediction of the theory that the inner-layer temperature decreases with increasing amount of hydrogen. The derived analytical expressions can be used to guide the adaption of combustion systems running on natural gas when hydrogen is added to the fuel.",
author = "{Goey, de}, L.P.H. and R.T.E. Hermanns and R.J.M. Bastiaans",
year = "2007",
doi = "10.1016/j.proci.2006.07.072",
language = "English",
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pages = "1031--1038",
journal = "Proceedings of the Combustion Institute",
issn = "1540-7489",
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}

Analysis of the asymptotic structure of stoichiometric premixed CH4-H2-air flames. / Goey, de, L.P.H.; Hermanns, R.T.E.; Bastiaans, R.J.M.

In: Proceedings of the Combustion Institute, Vol. 31, No. 1, 2007, p. 1031-1038.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Analysis of the asymptotic structure of stoichiometric premixed CH4-H2-air flames

AU - Goey, de,L.P.H.

AU - Hermanns,R.T.E.

AU - Bastiaans,R.J.M.

PY - 2007

Y1 - 2007

N2 - The classical asymptotic theory describing the structure of stoichiometric methane–air flames, introduced by Peters and Williams, has been extended to describe the structure of stoichiometric methane–hydrogen–air flames. The theory predicts a decreasing inner-layer temperature, while the adiabatic flame temperature increases slightly with increasing amount of hydrogen in the fuel. These changes together lead to an increasing burning velocity as a function of the amount of hydrogen in the fuel mixture. The predicted variations are compared with numerical results; the burning velocity is also compared with experiments and the agreement is reasonable. To demonstrate in an independent way that the decrease in the inner-layer temperature dominates the change in flame structure and burning velocity, additional measurements of the influence of heat loss on the burning velocity of methane–hydrogen–air flames are carried out. The effective activation energy governing this behavior shows a decrease as a function of the amount of hydrogen, confirming the prediction of the theory that the inner-layer temperature decreases with increasing amount of hydrogen. The derived analytical expressions can be used to guide the adaption of combustion systems running on natural gas when hydrogen is added to the fuel.

AB - The classical asymptotic theory describing the structure of stoichiometric methane–air flames, introduced by Peters and Williams, has been extended to describe the structure of stoichiometric methane–hydrogen–air flames. The theory predicts a decreasing inner-layer temperature, while the adiabatic flame temperature increases slightly with increasing amount of hydrogen in the fuel. These changes together lead to an increasing burning velocity as a function of the amount of hydrogen in the fuel mixture. The predicted variations are compared with numerical results; the burning velocity is also compared with experiments and the agreement is reasonable. To demonstrate in an independent way that the decrease in the inner-layer temperature dominates the change in flame structure and burning velocity, additional measurements of the influence of heat loss on the burning velocity of methane–hydrogen–air flames are carried out. The effective activation energy governing this behavior shows a decrease as a function of the amount of hydrogen, confirming the prediction of the theory that the inner-layer temperature decreases with increasing amount of hydrogen. The derived analytical expressions can be used to guide the adaption of combustion systems running on natural gas when hydrogen is added to the fuel.

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JO - Proceedings of the Combustion Institute

T2 - Proceedings of the Combustion Institute

JF - Proceedings of the Combustion Institute

SN - 1540-7489

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