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Effect of H-2/CO ratio and N-2/CO2 dilution rate on laminar burning velocity of syngas investigated by direct measurement and simulation

Wang, Z. H.; Weng, W. B.; He, Y.; Li, Zhongshan LU and Cen, K. F. (2015) In Fuel 141. p.285-292
Abstract
Laminar burning velocities of syngas/air premixed flames, varying with H-2/CO ratio (from 5/95 to 75/25) and N-2 or CO2 dilution rate (from 0% to 60%), were accurately measured using a Teflon coated Heat Flux burner and OH-PLIF based Bunsen flame method. Experiments were carried out at atmospheric pressure and room temperature, with fuel/air equivalence ratios ranging from fuel-lean to fuel-rich. Coupled with experimental data, three chemical kinetic mechanisms, namely GRI-Mech 3.0, USC Mech II and Davis H-2-CO mechanism, were validated. All of them can provide good prediction for the laminar burning velocity. The laminar burning velocity variations with H-2 and dilution gas contents were systematically investigated. For given dilution gas... (More)
Laminar burning velocities of syngas/air premixed flames, varying with H-2/CO ratio (from 5/95 to 75/25) and N-2 or CO2 dilution rate (from 0% to 60%), were accurately measured using a Teflon coated Heat Flux burner and OH-PLIF based Bunsen flame method. Experiments were carried out at atmospheric pressure and room temperature, with fuel/air equivalence ratios ranging from fuel-lean to fuel-rich. Coupled with experimental data, three chemical kinetic mechanisms, namely GRI-Mech 3.0, USC Mech II and Davis H-2-CO mechanism, were validated. All of them can provide good prediction for the laminar burning velocity. The laminar burning velocity variations with H-2 and dilution gas contents were systematically investigated. For given dilution gas fraction, the laminar burning velocity reduction rate was enhanced as H-2/CO ratio increasing. Effects of the syngas components and equivalence ratio variation on the concentrations of radical H and OH were also studied. It appears that there is a strong linear correlation between the laminar burning velocity and the maximum concentration of the H radical in the reaction zone for syngas. This characteristic is exclusively different from that in methane air premixed flame. These findings indicated that the high thermal diffusivity of the H radical played an important role in the laminar burning velocity enhancement and affected the laminar burning velocity reduction rate under dilution condition. (C) 2014 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Laminar burning velocity, Heat flux method, OH-PLIF, H radical, concentration
in
Fuel
volume
141
pages
285 - 292
publisher
Elsevier
external identifiers
  • wos:000345698800032
  • scopus:84910671322
ISSN
1873-7153
DOI
10.1016/j.fuel.2014.10.040
language
English
LU publication?
yes
id
22cd97f2-d277-424b-bb15-5a64dc02427a (old id 4962542)
date added to LUP
2015-01-29 11:45:58
date last changed
2017-06-04 03:49:34
@article{22cd97f2-d277-424b-bb15-5a64dc02427a,
  abstract     = {Laminar burning velocities of syngas/air premixed flames, varying with H-2/CO ratio (from 5/95 to 75/25) and N-2 or CO2 dilution rate (from 0% to 60%), were accurately measured using a Teflon coated Heat Flux burner and OH-PLIF based Bunsen flame method. Experiments were carried out at atmospheric pressure and room temperature, with fuel/air equivalence ratios ranging from fuel-lean to fuel-rich. Coupled with experimental data, three chemical kinetic mechanisms, namely GRI-Mech 3.0, USC Mech II and Davis H-2-CO mechanism, were validated. All of them can provide good prediction for the laminar burning velocity. The laminar burning velocity variations with H-2 and dilution gas contents were systematically investigated. For given dilution gas fraction, the laminar burning velocity reduction rate was enhanced as H-2/CO ratio increasing. Effects of the syngas components and equivalence ratio variation on the concentrations of radical H and OH were also studied. It appears that there is a strong linear correlation between the laminar burning velocity and the maximum concentration of the H radical in the reaction zone for syngas. This characteristic is exclusively different from that in methane air premixed flame. These findings indicated that the high thermal diffusivity of the H radical played an important role in the laminar burning velocity enhancement and affected the laminar burning velocity reduction rate under dilution condition. (C) 2014 Elsevier Ltd. All rights reserved.},
  author       = {Wang, Z. H. and Weng, W. B. and He, Y. and Li, Zhongshan and Cen, K. F.},
  issn         = {1873-7153},
  keyword      = {Laminar burning velocity,Heat flux method,OH-PLIF,H radical,concentration},
  language     = {eng},
  pages        = {285--292},
  publisher    = {Elsevier},
  series       = {Fuel},
  title        = {Effect of H-2/CO ratio and N-2/CO2 dilution rate on laminar burning velocity of syngas investigated by direct measurement and simulation},
  url          = {http://dx.doi.org/10.1016/j.fuel.2014.10.040},
  volume       = {141},
  year         = {2015},
}