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EFFECTS OF SIMPLIFIED CHEMICAL KINETIC MODEL ON THE MICRO-FLAME STRUCTURE AND TEMPERATURE OF THE LEAN PREMIXED METHANE-AIR MIXTURES


JUNJIE CHEN *, XUHUI GAO
Henan Polytechnic University, School of Mechanical and Power Engineering, 454000, Jiaozuo, China
*Corresponding author: comcjj@163.com

Issue:

SCSCC6, Volume XVI, No. 2

Section:

Volume XVI, No. 2 (2015)

Abstract:

The effect of simplified chemical kinetic model on the micro-flame structure, central axis and wall temperatures were investigated with different one-step global chemical kinetic mechanisms following Mantel, Duterque and Fernández-Tarrazo models. Numerical investigations of the premixed methane-air flame in the micro-channel and lean conditions were carried out to compare and analyze the effect of the comprehensive chemical kinetic mechanisms. The results indicate that one-step global chemical kinetic mechanism affects both the micro-flame shape and the combustion temperature. Among three simulation models, Mantel model allows a stable micro-flame with a bamboo shoot form, which anchor at the inlet. Duterque model gives a stable elongated micro-flame with a considerable ignition delay, and a dead zone with fluid accumulation is observed at the entrance, which may explain the very high combustion temperature and the fast reaction rate obtained, despite the micro-flame development presents a very hot spot and causes a broadening of the combustion zone. Fernández-Tarrazo model results in a rapid extinction and doesn't seem to take all the kinetic behavior into account for the appropriate micro-combustion simulations.

Keywords:

flame structure, flame temperature, micro-combustion, micro-flame, simplified chemical kinetic model.

Code [ID]:

CSCC6201502V02S01A0001 [0004230]

DOI:

Full paper:

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