Soot agglomeration in isolated, free droplet combustionUnder the conditions of an isolated, free droplet experiment, hollow, carbonaceous structures, called soot spheres, were observed to form during the atmospheric pressure, low Reynolds number combustion of 1-methylnaphthalene. These structures which are agglomerates composed of smaller spheroidal units result from both thermophoretic effects induced by the envelope flame surrounding each drop and aerodynamic effects caused by changes in the relative gas/drop velocities. A chemically reacting flow model was used to analyze the process of sootshell formation during microgravity droplet combustion. The time-dependent temperature and gas property field surrounding the droplet was determined, and the soot cloud location for microgravity combustion of n-heptane droplets was predicted. Experiments showed that the sooting propensity of n-alkane fuel droplets can be varied through diluent substitution, oxygen-index variations, and ambient pressure reductions.
Document ID
19930040896
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Choi, M. Y. (NASA Lewis Research Center Cleveland, OH, United States)
Dryer, F. L. (Princeton Univ. NJ, United States)
Green, G. J. (Mobil Research and Development Corp. Central Research Lab., Princeton, NJ, United States)
Sangiovanni, J. J. (United Technologies Research Center East Hartford, CT, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
AIAA PAPER 93-0823
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit