NDLI: Sooting limits of microgravity spherical diffusion flames. [conducted in the nasa glenn 2.2-second drop tower]

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Sooting limits of microgravity spherical diffusion flames. [conducted in the nasa glenn 2.2-second drop tower]

Content Provider	NASA Technical Reports Server (NTRS)
Author	Sunderland, P. B. Urban, D. L. Stocker, D. P. Chao, B.-H. Axelbaum, Richard L.
Copyright Year	2001
Description	Limiting conditions for soot-particle inception were studied in microgravity spherical diffusion flames burning ethylene at atmospheric pressure. Nitrogen was supplied in the fuel and/or oxidizer to obtain the broadest range of stoichiometric mixture fraction. Both normal flames (oxygen in ambience) and inverted flames (fuel in ambience) were considered. Microgravity was obtained in the NASA Glenn 2.2-second drop tower. The flames were observed with a color video camera and sooting conditions were defined as conditions for which yellow emission was present throughout the duration of the drop. Sooting limit results were successfully correlated in terms of adiabatic flame temperature and stoichiometric mixture fraction. Soot free conditions were favored by increased stoichiometric mixture fractions. No statistically significant effect of convection direction on sooting limits was observed. The relationship between adiabatic flame temperature and stoichiometric mixture fraction at the sooting limits was found to be in qualitative agreement with a simple theory based on the assumption that soot inception can occur only where temperature and local C/O ratio exceed threshold values (circa 1250 K and 1, respectively).
File Size	7752258
Page Count	19
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20020027073
Archival Resource Key	ark:/13960/t85j2gj6p
Language	English
Publisher Date	2001-01-01
Access Restriction	Open
Subject Keyword	Inorganic, Organic And Physical Chemistry Stoichiometry Diffusion Flames Flame Temperature Soot Ethylene Combustion Products Drop Towers Microgravity Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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