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The Burning of Large N-Heptane Droplets in MicrogravityExperimental results are presented on the burning and sooting behavior of large n-heptane droplets in air at atmospheric pressure under microgravity conditions. The experiments were performed at the Japanese Microgravity Center (JAMIC) 10 sec dropshaft in Hokkaido, Japan. Soot volume fraction, burning rate, flame standoff and luminosity were measured for droplets of 2.6 mm and 2.9 mm in initial diameter. These are the largest droplets for which soot volume fraction measurements have ever been performed. Previous measurements of soot volume fractions for n-heptane droplets, confined to smaller droplet sizes of less than 1.8 mm, indicated that maximum soot volume fraction increased monotonically with initial droplet size. The new results demonstrate for the first time that sooting tendency is reduced for large droplets as it has been speculated previously but never confirmed experimentally. The lower soot volume fractions for the larger droplets were also accompanied by higher burning rates. The observed phenomenon is believed to be caused by the dimensional influence on radiative heat losses from the flame. Numerical calculations confirm that soot radiation affects the droplet burning behavior.
Document ID
20020028056
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Manzello, Samuel L. (Illinois Univ. Chicago, IL United States)
Choi, Mun Young (Illinois Univ. Chicago, IL United States)
Kazakov, Andrei (Princeton Univ. NJ United States)
Dryer, Frederick L. (Princeton Univ. NJ United States)
Dobashi, Ritsu (Tokyo Univ. Japan)
Hirano, Toshisuke (Tokyo Univ. Japan)
Ferkul, Paul
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Propellants And Fuels
Meeting Information
Meeting: 28th International Symposium on Combustion
Location: Edinburgh, Scotland
Country: United Kingdom
Start Date: August 2, 2000
Sponsors: Illinois Univ., Tokyo Univ., Princeton Univ., NASA Glenn Research Center
Funding Number(s)
PROJECT: RTOP 101-32-0D
CONTRACT_GRANT: NCC3-655
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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