On the structure and extinction dynamics of partially-premixed flames; Theory and experiment

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Combustion Science and Technology; (UK)

DOI:https://doi.org/10.1080/00102208908924031· OSTI ID:5046859

Law, C K; Zhu, D L ^[1]; Li, T X ^[2]; Chung, S H; Kim, J S ^[3]

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1. Princeton Univ., NJ (USA). Dept. of Mechanical and Aerospace Engineering
2. Dept. of Engineering Thermophysics, Univ. of Science and Technology, Hefei (CN)
3. Dept. of Mechanical Engineering, Seoul National Univ., Seoul (KR)

The interaction and extinction dynamics of a partially-premixed flame ensemble, consisting of a premixed flame and a nonpremixed flame, are theoretically and experimentally studied for the counterflow configuration generated by a premixed fuel/oxidizer/inert stream and a fuel/inert stream. Separate asymptotic analyses are performed for the structure and extinction of a single merged flame, a binary premixed-nonpremixed flame, and a binary premixed-premixed flame; in the last case it is recognized that under certain situations a nonpremixed flame can exhibit the characteristics of a premixed flame. Theoretical results show that the extinction of a binary flame always occurs in a single stage, with the individual flames separated. The extent of separateness can be further modified by the preferential diffusion nature of the mixture. These predictions are completely substantiated by experimental results obtained by using mixtures consisting of methane, ethane or propane as the fuel and O/sub 2//N/sub 2/ as the oxidizer.

• OSTI ID: 5046859
• Journal Information: Combustion Science and Technology; (UK), Journal Name: Combustion Science and Technology; (UK) Vol. 64:4-6; ISSN 0010-2202; ISSN CBSTB
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKANES
ASYMPTOTIC SOLUTIONS
BINARY MIXTURES
CALCULATION METHODS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION KINETICS
DATA
DISPERSIONS
DYNAMICS
ETHANE
EXPERIMENTAL DATA
FLAME PROPAGATION
FLAMES
FUEL-AIR RATIO
HYDROCARBONS
INFORMATION
KINETICS
MECHANICS
METHANE
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
PROPANE
REACTION KINETICS
THEORETICAL DATA