Computations of Enhanced Soot Production in Flickering Diffusion Flames.
Computations of Enhanced Soot Production in Flickering
Diffusion Flames.
(478 K)
Smyth, K. C.; Shaddix, C. R.; Kaplan, C. R.
NISTIR 6030; June 1997.
U.S./Japan Government Cooperative Program on Natural
Resources (UJNR). Fire Research and Safety. 13th Joint
Panel Meeting. Volume 2. March 13-20, 1996,
Gaithersburg, MD, Beall, K. A., Editor(s), 15-20 pp,
1997.
Available from:
National Technical Information Service
Order number: PB97-184204
Keywords:
fire safety; fire research; soot; diffusion flames;
simulation
Abstract:
Recent experimental measurements of soot volume fraction
in a flickering CH4/air diffusion flame show that for
conditions in which the tip of the flame is clipped,
soot production is ~5 times greater than that measured
for a steady flame burning with the same mean fuel flow
velocity. Numerical simulations of both steady and
time-varying flickering CH4/air diffusion flames are
used to examine the differences in combustion conditions
which lead to this observed enhancement in soot
production in the flickering flames. These simulations
successfully predict that the maximum soot concentration
increases by over four times compared to the steady
flame and show that flickering flames exhibit much
longer residence times during which the local
temperatures and stoichiometries are favorable for soot
production.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899