Computational Study of State Relationships for Acetylene-Air Diffusion Flames With Soot Radiation.
Computational Study of State Relationships for
Acetylene-Air Diffusion Flames With Soot Radiation.
Zhang, Z.; Ezekoye, O. A.
American Society of Mechanical Engineers (ASME).
National Heat Transfer Conference, 1995. Proceedings,
30th. Combustion and Fire Research. Heat Transfer in
High Heat-Flux Systems. Volume 2. HTD-Vol. 304. August
6-8, 1995, Portland, OR, Peterson, R. B.; Ezekoye, O.A.;
Simon, T., Editor(s)(s), 45-51 pp, 1995.
Sponsor:National Institute of Standards and Technology,
heat transfer; combustion; fire research; heat flux;
diffusion flames; soot; acetylene; kinetics; reaction
kinetics; experiments; reaction kinetics
Time history effects are suspected to affect the
dynamics of soot evolution within heavily sooting
non-premixed flames. The majority of soot chemistry
calculations have been conducted for steady flame
configurations. In this study, the combustion processes
for a spherical acetylene-air diffusion flame element
are computed using two fundamentally different
approaches. In the first case, the state relationship
data from experiments are used to specify the major gas
species distributions, while in the second case, a
finite rate reaction mechanism is used. A simplified
soot mechanism which incorporates the effects of soot
nucleation, surface growth, oxidation and agglomeration
processes is used to specify the soot species evolution.
It is found that as the net radiative losses for the
diffusion flame element approach zero, the predictions
of the state relationships match the results from the
finite rate calculations.