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Record Details

Record 40 of 47519
Soot Formation in Laminar Premixed Methane/Oxygen Flames at Atmospheric Pressure
External Online Source: doi:10.1016/S0010-2180(98)00017-0
Author and Affiliation:
Xu, F.(Michigan Univ., Dept. of Aerospace Engineering, Ann Arbor, MI United States)
Lin, K.-C.(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)
Abstract: Flame 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.
Publication Date: Jan 01, 1998
Document ID:
20000032154
(Acquired Apr 21, 2000)
Subject Category: INORGANIC, ORGANIC AND PHYSICAL CHEMISTRY
Document Type: Journal Article
Publication Information: Combustion and Flame (ISSN 0010-2180); Volume 115; 195-209
Publisher Information: Elsevier Science Inc., United States
Contract/Grant/Task Num: NAS3-1245; NAS3-1878; NAS3-2048; RTOP 101-12-0A
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH United States
Organization Source: Michigan Univ.; Dept. of Aerospace Engineering; Ann Arbor, MI United States
Description: 16p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ATMOSPHERIC PRESSURE; GAS TEMPERATURE; METHANE; OXYGEN; PREMIXED FLAMES; SOOT; COMBUSTION PRODUCTS; GAS CHROMATOGRAPHY; LASER DOPPLER VELOCIMETERS; HYDROCARBONS; TRANSMISSION ELECTRON MICROSCOPY
Availability Source: Other Sources
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