Flame balls - Past, present and futureThis paper discusses analytical and numerical work that has been carried out in order to understand flame-balls and related phenomena that have been observed in microgravity experiments. The importance of heat losses is identified, whether from conduction, convection, or radiation. Accurate numerical simulations for hydrogen-air mixtures with radiation losses reveal a flammability limit of 3.5 percent of hydrogen by volume, a value close to the experimental one. The important role of stability analyses is emphasized, with particular attention to the role of three-dimensional instabilities in explaining unsteady spheroidal flames and flame-strings, objects that are observed in the experiments. We speculate that the dynamics of flame-strings is affected by in-depth radiation absorption for mixtures containing SF6, and report on some preliminary calculations in which this phenomenon is accounted for.
Document ID
19930040810
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Buckmaster, J. (Illinois Univ. Urbana, United States)
Ronney, P. (Princeton Univ. NJ, United States)
Smooke, M. (Yale Univ. New Haven, CT, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
AIAA PAPER 93-0712
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit