Nitric oxide detection in turbulent premixed methane/air flames
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Author (Corporation)
Publication date
01.2005
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01A - Journal article
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Parent work
Proceedings of the Combustion Institute
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Volume
30
Issue / Number
1
Pages / Duration
1517-1525
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Elsevier
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Abstract
Investigations of the nitric oxide formation mechanisms of turbulent premixed methane/air flames, with regard to turbulence properties and equivalence ratio, are presented. An atmospheric burner with perforated turbulence generating grids allowed the realization of different turbulent flow conditions (Re = 8.5 × 103–1.7 × 104, u′/sL = 0.8–8.0), which were measured by PIV. Planar LIF was used to detect the OH radical (as a tracer for the flame front) and to visualize the distribution of NO in a two-dimensional area for the whole flame up to far downstream positions. A chemiluminescence detection (CLD) of the NO concentration in the post-flame gases was employed to quantify the NO-LIF measurements. The influence of the equivalence ratio on the spatial distribution of NO was similar to numerical predictions for laminar flames, while variations of turbulence conditions played a rather minor role. The statistical evaluation of local flame front locations enabled the determination of their fluctuation region and its probability distribution. Comparing ensemble-averaged and distribution width of the flame location along the burner axis with the spatial distribution of NO assisted in the understanding of the relative contributions of prompt- and thermal-NO formation paths for different values of the equivalence ratio and turbulence intensity in turbulent premixed flames. Furthermore, qualitative single shot NO-LIF measurements showed structural features, resembling those of the instantaneous turbulent flame front.
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ISBN
ISSN
1540-7489
1873-2704
1873-2704
Language
English
Created during FHNW affiliation
No
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Publication status
Published
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Peer review of the complete publication
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Closed
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Citation
Herrmann, K., & Boulouchos, K. (2005). Nitric oxide detection in turbulent premixed methane/air flames. Proceedings of the Combustion Institute, 30(1), 1517–1525. https://doi.org/10.1016/j.proci.2004.08.100