A Study on Flame Structures in CH₄ Counterflow Partially Premixed Flame

Abstract:

An experimental and simulation work had been conducted to study a one-dimensional partially premixed methane/air counterflow flame in this paper. Flame images are obtained through experiments and computations using GRIMech 3.00 chemistry were performed for the flames studied. The partially premixing effects upon the flame were revealed by comparing the flame structures and emissions with premixed flames at the same equivalence ratio. The results show the premixed flame only has a single flame structure. However, PPF has distinct double flame structures at present equivalence ratio. Temperature is relatively high in the whole combustion zone for premixed flame, while, for PPF, there are two temperature peaks in a rich premixed reaction zone on the fuel side and a nonpremixed reaction zone on the oxidizer side respectively. For PPF, NO concentration in the nonpremixed zone is much higher compared to that in the rich premixed zone because of higher OH concentration in the nonpremixed zone.

• Periodical: Applied Mechanics and Materials (Volume 694)
• Pages: 474-477
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.694.474
• Online since: November 2014
• Authors: Jing Luo*, Lian Sheng Liu, Zi Zhong Chen
• Keywords: Flame Structures, NO Emission, Partially Premixed Flame (PPF)

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