NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 85 of 21032
Structure of the Soot Growth Region of Laminar Premixed Methane/Oxygen Flames. Appendix G
External Online Source: doi:10.1016/S0010-2180(99)00170-4
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)
Yuan, Z.-G. [Technical Monitor]
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: Jan 01, 2000
Document ID:
20030016527
(Acquired Mar 07, 2003)
Subject Category: INORGANIC, ORGANIC AND PHYSICAL CHEMISTRY
Document Type: Reprint
Publication Information: Combustion and Flame (ISSN 0010-2180); Volume 121; 640-650
Publisher Information: Elsevier Science, Inc., Unknown
Contract/Grant/Task Num: NAG3-1245; NAG3-1878; NAG3-2048
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH United States
Organization Source: Michigan Univ.; Dept. of Aerospace Engineering; Ann Arbor, MI United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: PREMIXED FLAMES; FLAME PROPAGATION; CHEMICAL REACTIONS; COMBUSTION PHYSICS; SOOT; HYDROGEN ATOMS; THERMODYNAMIC EQUILIBRIUM; MATHEMATICAL MODELS; LASER DOPPLER VELOCIMETERS; THERMOPILES; GAS CHROMATOGRAPHY; PERFORMANCE PREDICTION; COMPUTERIZED SIMULATION; APPLICATIONS PROGRAMS (COMPUTERS)
Availability Source: Other Sources
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 22, 2011
Contact Us