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Accurate measurements of laminar burning velocity using the Heat Flux method and thermographic phosphor technique

Li, Bo LU ; Lindén, Johannes LU ; Li, Zhongshan LU ; Konnov, Alexander LU ; Aldén, Marcus LU and de Goey, L. P. H. (2011) In Proceedings of the Combustion Institute 33. p.939-946
Abstract
The Heat Flux method was further developed to significantly reduce its experimental uncertainty and used to determine burning velocities under conditions when the net heat loss from the flame to the burner is zero. Non-stretched flames were stabilized on a perforated plate burner at 1 atm. Measurements of the adiabatic burning velocity of methane air flames at initial mixture temperatures of 318 K are presented. Previously, tiny thermocouples in the thin burner plate were used to evaluate when the heat flux of the flame to the burner is zero. Related errors limit the accuracy of the method so far. A new experimental procedure based on thermographic phosphors is described which avoids these errors. The new experimental procedure is... (More)
The Heat Flux method was further developed to significantly reduce its experimental uncertainty and used to determine burning velocities under conditions when the net heat loss from the flame to the burner is zero. Non-stretched flames were stabilized on a perforated plate burner at 1 atm. Measurements of the adiabatic burning velocity of methane air flames at initial mixture temperatures of 318 K are presented. Previously, tiny thermocouples in the thin burner plate were used to evaluate when the heat flux of the flame to the burner is zero. Related errors limit the accuracy of the method so far. A new experimental procedure based on thermographic phosphors is described which avoids these errors. The new experimental procedure is described. An UV thermographic phosphor ZnO:Zn was selected and used to sensitively control the temperature uniformity on the burner plate to within 60 mK. Uncertainties of the measurements were analyzed and assessed experimentally. A more accurate evaluation of the gas velocities, using mass weighting, was introduced to increase the accuracy further. The uncertainty of the measured adiabatic burning velocities due to the temperature scattering can be reduced from typically +/-1.5 cm s at Phi = 0.7 methane air flame to +/-0.25 cm s. The overall accuracy of the burning velocities including the uncertainty from the employed mass flow controllers was evaluated to be better than +/-0.35 cm s. Possibilities to further improve the measurement accuracy are discussed with practical considerations. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Burning velocity, Heat Flux method, Thermographic phosphor
in
Proceedings of the Combustion Institute
volume
33
pages
939 - 946
publisher
Elsevier
external identifiers
  • wos:000285780200099
  • scopus:78650862145
ISSN
1540-7489
DOI
10.1016/j.proci.2010.06.111
language
English
LU publication?
yes
id
52659dd0-2fe5-45fc-b03d-22eaf49331c0 (old id 1870185)
date added to LUP
2011-04-18 13:21:54
date last changed
2017-03-26 03:22:09
@article{52659dd0-2fe5-45fc-b03d-22eaf49331c0,
  abstract     = {The Heat Flux method was further developed to significantly reduce its experimental uncertainty and used to determine burning velocities under conditions when the net heat loss from the flame to the burner is zero. Non-stretched flames were stabilized on a perforated plate burner at 1 atm. Measurements of the adiabatic burning velocity of methane air flames at initial mixture temperatures of 318 K are presented. Previously, tiny thermocouples in the thin burner plate were used to evaluate when the heat flux of the flame to the burner is zero. Related errors limit the accuracy of the method so far. A new experimental procedure based on thermographic phosphors is described which avoids these errors. The new experimental procedure is described. An UV thermographic phosphor ZnO:Zn was selected and used to sensitively control the temperature uniformity on the burner plate to within 60 mK. Uncertainties of the measurements were analyzed and assessed experimentally. A more accurate evaluation of the gas velocities, using mass weighting, was introduced to increase the accuracy further. The uncertainty of the measured adiabatic burning velocities due to the temperature scattering can be reduced from typically +/-1.5 cm s at Phi = 0.7 methane air flame to +/-0.25 cm s. The overall accuracy of the burning velocities including the uncertainty from the employed mass flow controllers was evaluated to be better than +/-0.35 cm s. Possibilities to further improve the measurement accuracy are discussed with practical considerations. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Li, Bo and Lindén, Johannes and Li, Zhongshan and Konnov, Alexander and Aldén, Marcus and de Goey, L. P. H.},
  issn         = {1540-7489},
  keyword      = {Burning velocity,Heat Flux method,Thermographic phosphor},
  language     = {eng},
  pages        = {939--946},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute},
  title        = {Accurate measurements of laminar burning velocity using the Heat Flux method and thermographic phosphor technique},
  url          = {http://dx.doi.org/10.1016/j.proci.2010.06.111},
  volume       = {33},
  year         = {2011},
}