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Laminar burning velocities of methane + formic acid + air flames : Experimental and modeling study

Lubrano Lavadera, Marco LU and Konnov, Alexander A. LU (2021) In Combustion and Flame 225. p.65-73
Abstract

Laminar burning velocities of methane + formic acid + air flames were determined using the heat flux method at 1 atm and initial gas temperature of 353 K. For fuel mixtures containing 75 or 50% mole fraction of HCOOH, a range of equivalence ratios from 0.7 to 1.3 was covered. In stoichiometric mixtures burning velocities were measured varying fuel composition from pure methane to 85% of formic acid. Due to the relatively high initial temperature close to the operational limit of the present burner, an extrapolation procedure had to be used leading to rather high experimental uncertainties up to ± 2 cm/s. New measurements have been compared with the predictions of the recent kinetic model of the authors and the model of Glarborg et al.... (More)

Laminar burning velocities of methane + formic acid + air flames were determined using the heat flux method at 1 atm and initial gas temperature of 353 K. For fuel mixtures containing 75 or 50% mole fraction of HCOOH, a range of equivalence ratios from 0.7 to 1.3 was covered. In stoichiometric mixtures burning velocities were measured varying fuel composition from pure methane to 85% of formic acid. Due to the relatively high initial temperature close to the operational limit of the present burner, an extrapolation procedure had to be used leading to rather high experimental uncertainties up to ± 2 cm/s. New measurements have been compared with the predictions of the recent kinetic model of the authors and the model of Glarborg et al. [34]. Both models failed, and the reasons for the disagreement were analysed. A modification of the rate constant of reaction HOCO(+M)=H+CO2(+M) was suggested that dramatically improved the present model performance. This model was then compared with the predictions of the model developed by Marshall and Glarborg [19] at the conditions of the available experimental data for HCOOH flames. The comparison indicates some inconsistencies in the recent measurements of the burning velocity of formic acid.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Burning velocity, Formic acid, Kinetic model, Methane
in
Combustion and Flame
volume
225
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:85095693561
ISSN
0010-2180
DOI
10.1016/j.combustflame.2020.10.050
language
English
LU publication?
yes
id
7027703c-327a-4675-931a-9e7da5300c21
date added to LUP
2020-11-23 15:12:56
date last changed
2022-04-26 22:05:12
@article{7027703c-327a-4675-931a-9e7da5300c21,
  abstract     = {{<p>Laminar burning velocities of methane + formic acid + air flames were determined using the heat flux method at 1 atm and initial gas temperature of 353 K. For fuel mixtures containing 75 or 50% mole fraction of HCOOH, a range of equivalence ratios from 0.7 to 1.3 was covered. In stoichiometric mixtures burning velocities were measured varying fuel composition from pure methane to 85% of formic acid. Due to the relatively high initial temperature close to the operational limit of the present burner, an extrapolation procedure had to be used leading to rather high experimental uncertainties up to ± 2 cm/s. New measurements have been compared with the predictions of the recent kinetic model of the authors and the model of Glarborg et al. [34]. Both models failed, and the reasons for the disagreement were analysed. A modification of the rate constant of reaction HOCO(+M)=H+CO<sub>2</sub>(+M) was suggested that dramatically improved the present model performance. This model was then compared with the predictions of the model developed by Marshall and Glarborg [19] at the conditions of the available experimental data for HCOOH flames. The comparison indicates some inconsistencies in the recent measurements of the burning velocity of formic acid.</p>}},
  author       = {{Lubrano Lavadera, Marco and Konnov, Alexander A.}},
  issn         = {{0010-2180}},
  keywords     = {{Burning velocity; Formic acid; Kinetic model; Methane}},
  language     = {{eng}},
  pages        = {{65--73}},
  publisher    = {{Elsevier}},
  series       = {{Combustion and Flame}},
  title        = {{Laminar burning velocities of methane + formic acid + air flames : Experimental and modeling study}},
  url          = {{http://dx.doi.org/10.1016/j.combustflame.2020.10.050}},
  doi          = {{10.1016/j.combustflame.2020.10.050}},
  volume       = {{225}},
  year         = {{2021}},
}