Combustion of a Spherical Diffusion Flame in a Radiative Field.
Combustion of a Spherical Diffusion Flame in a Radiative
Field.
(492 K)
Zhang, Z.; Ezekoye, O. A.
American Society of Mechanical Engineers. Fire,
Combustion, and Hazardous Waste Processing. HTD-Vol.
296. November 6-11, 1994, Chicago, IL, American Society
of Mechanical Engineers, NY, Acharya, S.; Annamalai, K.;
Presser, C.; Skocypec, R. D., Editor(s)(s), 7-13 pp,
1994.
Sponsor:
National Institute of Standards and Technology,
Gaithersburg, MD
Keywords:
combustion; hazardous materials; waste disposal;
predictive models; diffusion flames; combustion; flow;
soot
Abstract:
One methodology for modeling fire induced flow fields is
based upon a Lagrangian view of the fire. Large scale
processes are modeled using a Large Eddy Simulation
(LES) method and are then appropriately coupled to a
subgird scale model of the small scale combustion
processes. The subgrid scale combustion model utilizes
Lagrangian flamelets. On the subgrid scale, detailed
computations are performed to calculate the combustion
history of an individual fuel element with prescribed
initial conditions. In this paper, the soot evolution
and burning characteristics within a spherical diffusion
flame element are phenomenologically model and the
possibility of radiation quenching for certain soot
loadings is noted. A comparison is made between finite
rate chemistry effects and fast or diffusion limited
chemistry results.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899