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Soot Formation in Laminar Premixed Methane/Oxygen Flames at Atmospheric PressureFlame structure and soot formation were studied within soot-containing laminar premixed mc1hane/oxygen flames at atmospheric pressure. The following measurements were made: soot volume fractions by laser extinction, soot temperatures by multiline emission, gas temperatures (where soot was absent) by corrected fine-wire thermocouples, soot structure by thermophoretic sampling and transmission electron microscope (TEM), major gas species concentrations by sampling and gas chromatography, and gas velocities by laser velocimetry. Present measurements of gas species concentrations were in reasonably good agreement with earlier measurements due to Ramer et al. as well as predictions based on the detailed mechanisms of Frenklach and co-workers and Leung and Lindstedt: the predictions also suggest that H atom concentrations are in local thermodynamic equilibrium throughout the soot formation region. Using this information, it was found that measured soot surface growth rates could be correlated successfully by predictions based on the hydrogen-abstraction/carbon-addition (HACA) mechanisms of both Frenklach and co-workers and Colket and Hall, extending an earlier assessment of these mechanisms for premixed ethylene/air flames to conditions having larger H/C ratios and acetylene concentrations. Measured primary soot particle nucleation rates were somewhat lower than the earlier observations for laminar premixed ethylene/air flames and were significantly lower than corresponding rates in laminar diffusion flames. for reasons that still must be explained.
Document ID
20000032154
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
Authors
Xu, F.
(Michigan Univ. Ann Arbor, MI United States)
Lin, K.-C.
(Michigan Univ. Ann Arbor, MI United States)
Faeth, G. M.
(Michigan Univ. Ann Arbor, MI United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1998
Publication Information
Publication: Combustion and Flame
Publisher: Elsevier Science Inc.
Volume: 115
ISSN: 0010-2180
Subject Category
Inorganic, Organic And Physical Chemistry
Funding Number(s)
PROJECT: RTOP 101-12-0A
CONTRACT_GRANT: NAS3-2048
CONTRACT_GRANT: NAS3-1245
CONTRACT_GRANT: NAS3-1878
Distribution Limits
Public
Copyright
Other

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