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Record 79 of 21032
Structure of the Soot Growth Region of Laminar Premixed Methane/Oxygen Flames. Appendix I
Author and Affiliation:
Xu, F.(Michigan Univ., Dept. of Aerospace Engineering, Ann Arbor, MI United States)
Faeth, G. M.(Michigan Univ., Dept. of Aerospace Engineering, Ann Arbor, MI United States)
Urban, D. L. [Technical Monitor]
Yuan, Z.-G. [Technical Monitor]
Abstract: The structure of the soot growth region of laminar premixed methane/oxygen flames (fuel-equivalence ratios of 1.60-2.77) was studied both experimentally and computationally. Measurements were carried out in flames stabilized on a flat flame burner operated at standard temperature and pressure, and included velocities by laser velocimetry, soot volume fractions by laser extinction, soot temperatures by multiline emission, gas temperatures (where soot was absent) by corrected fine-wire thermocouples, major gas species concentrations by sampling and gas chromatography, and hydrogen atom concentrations by the Li/LiOH technique in conjunction with atomic absorption to find the proportion of free lithium in the flames. The measured concentrations of major gas species were in reasonably good agreement with predictions based on the detailed mechanisms of Leung and Lindstedt, and Frenklach and coworkers. The measurements also confirmed predictions of both these mechanisms that H-atom concentrations are in local thermodynamic equilibrium throughout the soot growth region even through the concentrations of major gas species are not. Thus, present findings support recent evaluations of the hydrogen-abstraction/carbon-addition (HACA) soot growth mechanism in similar flames, where the approximation that H-atom concentrations were in local thermodynamic equilibrium was adopted, based on predictions using the two mechanisms, due to the absence of direct H-atom concentration measurements.
Publication Date: Dec 15, 2001
Document ID:
20020088426
(Acquired Nov 29, 2002)
Subject Category: INORGANIC, ORGANIC AND PHYSICAL CHEMISTRY
Document Type: Reprint
Publication Information: Soot Formation in Freely-Propagating Laminar Premixed Flames (ISSN 0010-2180); 272-283; (GDL-GMF-01-01)
Contract/Grant/Task Num: NAG3-1245; NAG3-2048; NAG3-1878
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH United States
Organization Source: Michigan Univ.; Dept. of Aerospace Engineering; Ann Arbor, MI United States
Description: 11p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: SOOT; STRUCTURAL ANALYSIS; CRYSTAL GROWTH; LAMINAR FLOW; METHANE; PREMIXED FLAMES; OXYGEN; ATOM CONCENTRATION; BURNERS; CARBON; CONCENTRATION (COMPOSITION); GAS CHROMATOGRAPHY; GAS COMPOSITION; GAS TEMPERATURE
Imprint And Other Notes: Repr. from Combustion and Flame (Elsevier Science, Inc.), v. 121, 2000 p 640-650
Availability Source: Other Sources
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