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Computational Study of State Relationships for Acetylene-Air Diffusion Flames With Soot Radiation.


pdf icon Computational Study of State Relationships for Acetylene-Air Diffusion Flames With Soot Radiation. (673 K)
Zhang, Z.; Ezekoye, O. A.

HTD-Vol. 304;

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, Gaithersburg, MD

Keywords:

heat transfer; combustion; fire research; heat flux; diffusion flames; soot; acetylene; kinetics; reaction kinetics; experiments; reaction kinetics

Abstract:

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.