NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A Theoretical Study of Propagation and Extinction of Nonsteady Spherical Flame FrontsFreely propagating expanding spherical flame fronts are studied analytically using the method of activation energy asymptotics. Effects of Lewis number (Le), curvature, heat loss, and thermal expansion on propagation rates and extinction conditions are examined. The behavior of spherical flame fronts is found to be determined primarily by the values of Le and a heat-loss parameter. Results are compared to recent experimental observations of spherical flame fronts in mixtures near the flammability limits; for Le less than 1, it is found that many of the features of these experimental results are described by the analysis presented here. For Le greater than 1, however, unrealistic dynamic behavior is predicted due to the nature of diffusive-thermal instabilities under these conditions.
Document ID
19890061205
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ronney, P. D.
(Princeton University NJ, United States)
Sivashinsky, G. I.
(Princeton University NJ; Tel Aviv University, Israel)
Date Acquired
August 14, 2013
Publication Date
August 1, 1989
Publication Information
Publication: SIAM Journal on Applied Mathematics
Volume: 49
ISSN: 0036-1399
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
E-8379
E-8383
Accession Number
89A48576
Funding Number(s)
CONTRACT_GRANT: NSF ISI-85-21252
CONTRACT_GRANT: DE-FG02-88ER-13822
CONTRACT_GRANT: NSF CBT-86-57228
CONTRACT_GRANT: N00014-86-K-0759
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available