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A projection procedure to obtain adiabatic flames from non-adiabatic flames using heat flux method

Han, Xinlu LU ; Wang, Zhihua ; He, Yong ; Wang, Shixing ; Zhu, Yanqun ; Liu, Yingzu and Konnov, Alexander A. LU (2021) In Proceedings of the Combustion Institute 38(2). p.2143-2151
Abstract

Laminar burning velocity S L at elevated temperature T u and its temperature dependence coefficient α in SL/S0L = (Tu T0u)α are important parameters for industrial applications. However, experimental systems with high unburned gas temperatures may encounter pre-dissociation, leading to significant data scattering in the measurements. To negate this, the present work proposes a projection procedure to obtain adiabatic flame parameters at various unburned gas temperatures using non-adiabatic flames on a heat flux burner, by which the preheating can be achieved within much shorter time scale than, e.g., in conventional spherical flame methods, and the advantage of... (More)

Laminar burning velocity S L at elevated temperature T u and its temperature dependence coefficient α in SL/S0L = (Tu T0u)α are important parameters for industrial applications. However, experimental systems with high unburned gas temperatures may encounter pre-dissociation, leading to significant data scattering in the measurements. To negate this, the present work proposes a projection procedure to obtain adiabatic flame parameters at various unburned gas temperatures using non-adiabatic flames on a heat flux burner, by which the preheating can be achieved within much shorter time scale than, e.g., in conventional spherical flame methods, and the advantage of good data consistency in the heat flux method is kept. Burning velocity experiments were carried out with CH 4 + air atmospheric flames covering T u = 298-473 K, and the results show good agreement with the proposed projection equations. OH * spontaneous emission profiles were measured, indicating that the projection may extend to other flame characteristics. Uncertainty of the projection process was evaluated and comparisons were made with six popular kinetic mechanisms: GRI-Mech, FFCM-1 mech, Konnov mechanism, Glarborg mechanism, San Diego mechanism and Aramco mechanism. It is found that the simulated coefficients α are higher than experimental data especially at rich conditions; this is also found for literature values of high unburned gas temperature experiments. Possible reasons for this divergence are discussed.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Elevated temperature, Heat flux method, Laminar burning velocity, Temperature dependence
in
Proceedings of the Combustion Institute
volume
38
issue
2
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:85089659103
ISSN
1540-7489
DOI
10.1016/j.proci.2020.07.027
language
English
LU publication?
yes
id
55137bfd-0b6c-41ce-8a64-e06171e893dc
date added to LUP
2021-01-08 14:39:52
date last changed
2025-04-04 15:00:26
@article{55137bfd-0b6c-41ce-8a64-e06171e893dc,
  abstract     = {{<p>Laminar burning velocity S L at elevated temperature T u and its temperature dependence coefficient α in S<sub>L</sub>/S<sup>0</sup><sub>L</sub> = (T<sub>u</sub> T<sup>0</sup><sub>u</sub>)<sup>α</sup> are important parameters for industrial applications. However, experimental systems with high unburned gas temperatures may encounter pre-dissociation, leading to significant data scattering in the measurements. To negate this, the present work proposes a projection procedure to obtain adiabatic flame parameters at various unburned gas temperatures using non-adiabatic flames on a heat flux burner, by which the preheating can be achieved within much shorter time scale than, e.g., in conventional spherical flame methods, and the advantage of good data consistency in the heat flux method is kept. Burning velocity experiments were carried out with CH <sub>4</sub> + air atmospheric flames covering T <sub>u</sub> = 298-473 K, and the results show good agreement with the proposed projection equations. OH * spontaneous emission profiles were measured, indicating that the projection may extend to other flame characteristics. Uncertainty of the projection process was evaluated and comparisons were made with six popular kinetic mechanisms: GRI-Mech, FFCM-1 mech, Konnov mechanism, Glarborg mechanism, San Diego mechanism and Aramco mechanism. It is found that the simulated coefficients α are higher than experimental data especially at rich conditions; this is also found for literature values of high unburned gas temperature experiments. Possible reasons for this divergence are discussed.</p>}},
  author       = {{Han, Xinlu and Wang, Zhihua and He, Yong and Wang, Shixing and Zhu, Yanqun and Liu, Yingzu and Konnov, Alexander A.}},
  issn         = {{1540-7489}},
  keywords     = {{Elevated temperature; Heat flux method; Laminar burning velocity; Temperature dependence}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{2143--2151}},
  publisher    = {{Elsevier}},
  series       = {{Proceedings of the Combustion Institute}},
  title        = {{A projection procedure to obtain adiabatic flames from non-adiabatic flames using heat flux method}},
  url          = {{http://dx.doi.org/10.1016/j.proci.2020.07.027}},
  doi          = {{10.1016/j.proci.2020.07.027}},
  volume       = {{38}},
  year         = {{2021}},
}