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International Heat Transfer Conference 11

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

ANALYSES OF EXTINCTION AND FLAMMABILITY LIMIT OF STRETCHED PREMIXED FLAMES USING THE STATISTICAL NARROW-BAND MODEL

Yiguang Ju
Dept. of Aeronautics and Space Engineering, Tohoku University Aiamaki Aoba, Aoba-ku, Sendai 980, Japan

Kenichi Takita
Tohoku University

Masuya Goro
Dept. of Aeronautics and Space Engineering, Tohoku University Aiamaki Aoba, Aoba-ku, Sendai 980, Japan

Fengshan Liu
National Research Council, Combustion Technology Group, Institute for Chemical Process & Environmental Technology, National Research Council Building M-9, 1200 Montreal Road, Ottawa, Ontario, Canada K1 A 0R6

Hongsheng Guo
Combustion Research Group Institute for Chemical Process and Environmental Technology National Research Council Canada, Building M-9, Montreal Road, Ottawa, Kl A 0R6

DOI: 10.1615/IHTC11.4280
pages 301-306

Abstrakt

Extinction and flammability limit of nonadiabatic stretched premixed methane-air flame are numerically investigated using the statistical narrow-band model. Attention is paid to the radiation induced non-linear phenomena and to the effeet of radiation reabsorption. It is found that even for a mixture at an equivalence ratio lower than the standard lean flammability limit (lean limit of one-dimensional unstrained flame), a moderate stretch can makes the mixture burn. The flammable region of this sub-limit NSF (Near Stagnation plane Flame) is bounded by the stretch extinction limit and the radiation extinction limit. For equivalence ratio larger than a critical value, it is found that the closed NSF branch opens up and yields two stable flame branches, a weak flame branch and a normal flame branch. A G-shaped curve showing the flammable regions of the weak flame and the normal flame is obtained. The effect of radiation reabsorption on flame extinction is examined by comparing the G-shaped extinction curve predicted by the narrow-band model with that calculated by optically thin model. Finally, a qualitative agreement between the experimental data and the predicted results is shown.

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