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Experimental studies of nitromethane flames and evaluation of kinetic mechanisms

Brackmann, Christian LU ; Nauclér, Jenny D. LU ; El-Busaidy, Said; Hosseinia, Ali; Bengtsson, Per Erik LU ; Konnov, Alexander A. LU and Nilsson, Elna J.K. LU (2018) In Combustion and Flame 190. p.327-336
Abstract

The present work reports new experimental data for premixed flames of nitromethane, CH3NO2, at atmospheric pressure, and an evaluation of two contemporary kinetic mechanisms based on these new flame studies as well as previously published experimental data on laminar burning velocity and ignition. Flames of nitromethane + air at lean (ϕ = 0.8) and rich (ϕ = 1.2) conditions were stabilized on a flat-flame burner, where profiles of CH2O, CO and NO were obtained using laser-induced fluorescence and temperature profiles using coherent anti-Stokes Raman spectroscopy. Laminar burning velocities for nitromethane + O2 + CO2 were measured using the heat flux method for ϕ = 0.8–1.3 at 348 K... (More)

The present work reports new experimental data for premixed flames of nitromethane, CH3NO2, at atmospheric pressure, and an evaluation of two contemporary kinetic mechanisms based on these new flame studies as well as previously published experimental data on laminar burning velocity and ignition. Flames of nitromethane + air at lean (ϕ = 0.8) and rich (ϕ = 1.2) conditions were stabilized on a flat-flame burner, where profiles of CH2O, CO and NO were obtained using laser-induced fluorescence and temperature profiles using coherent anti-Stokes Raman spectroscopy. Laminar burning velocities for nitromethane + O2 + CO2 were measured using the heat flux method for ϕ = 0.8–1.3 at 348 K and ϕ = 0.8–1.6 at 358 K, and an oxidizer composition of 35% O2 and 65% CO2. In addition, the effect of the oxidizer composition was examined for a stoichiometric flame at 358 K by varying oxygen fraction from 30% to 40%. The mechanism by Mathieu et al. (Fuel 2016, 182, 597), previously not validated for flames, was able to reproduce experimental laminar burning velocities for nitromethane + air, but under predicted new results for CH3NO2 + O2 + CO2 mixtures. The mechanism by Brequigny et al. (Proc. Combust. Inst. 2014, 35, 703) under predicted experimental laminar burning velocities significantly at all investigated conditions. Previous studies have shown that none of the mechanisms can accurately predict ignition delay time over a wide range of conditions with respect to pressure, temperature, diluent and dilution ratio. The evaluation of the mechanisms reveals that the understanding of nitromethane combustion is at the present time not sufficient to produce a widely applicable mechanism.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Burning velocity, Flame structure, Kinetic modeling, Nitromethane, Oxy-fuel
in
Combustion and Flame
volume
190
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85039447494
ISSN
0010-2180
DOI
10.1016/j.combustflame.2017.12.011
language
English
LU publication?
yes
id
48bb8a39-999f-4fa1-8fef-2f61518caa1a
date added to LUP
2018-01-05 09:58:05
date last changed
2018-01-05 09:58:05
@article{48bb8a39-999f-4fa1-8fef-2f61518caa1a,
  abstract     = {<p>The present work reports new experimental data for premixed flames of nitromethane, CH<sub>3</sub>NO<sub>2</sub>, at atmospheric pressure, and an evaluation of two contemporary kinetic mechanisms based on these new flame studies as well as previously published experimental data on laminar burning velocity and ignition. Flames of nitromethane + air at lean (ϕ = 0.8) and rich (ϕ = 1.2) conditions were stabilized on a flat-flame burner, where profiles of CH<sub>2</sub>O, CO and NO were obtained using laser-induced fluorescence and temperature profiles using coherent anti-Stokes Raman spectroscopy. Laminar burning velocities for nitromethane + O<sub>2</sub> + CO<sub>2</sub> were measured using the heat flux method for ϕ = 0.8–1.3 at 348 K and ϕ = 0.8–1.6 at 358 K, and an oxidizer composition of 35% O<sub>2</sub> and 65% CO<sub>2</sub>. In addition, the effect of the oxidizer composition was examined for a stoichiometric flame at 358 K by varying oxygen fraction from 30% to 40%. The mechanism by Mathieu et al. (Fuel 2016, 182, 597), previously not validated for flames, was able to reproduce experimental laminar burning velocities for nitromethane + air, but under predicted new results for CH<sub>3</sub>NO<sub>2</sub> + O<sub>2</sub> + CO<sub>2</sub> mixtures. The mechanism by Brequigny et al. (Proc. Combust. Inst. 2014, 35, 703) under predicted experimental laminar burning velocities significantly at all investigated conditions. Previous studies have shown that none of the mechanisms can accurately predict ignition delay time over a wide range of conditions with respect to pressure, temperature, diluent and dilution ratio. The evaluation of the mechanisms reveals that the understanding of nitromethane combustion is at the present time not sufficient to produce a widely applicable mechanism.</p>},
  author       = {Brackmann, Christian and Nauclér, Jenny D. and El-Busaidy, Said and Hosseinia, Ali and Bengtsson, Per Erik and Konnov, Alexander A. and Nilsson, Elna J.K.},
  issn         = {0010-2180},
  keyword      = {Burning velocity,Flame structure,Kinetic modeling,Nitromethane,Oxy-fuel},
  language     = {eng},
  month        = {04},
  pages        = {327--336},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {Experimental studies of nitromethane flames and evaluation of kinetic mechanisms},
  url          = {http://dx.doi.org/10.1016/j.combustflame.2017.12.011},
  volume       = {190},
  year         = {2018},
}