TITLE

Structure of lean premixed hydrogen-air flames in an annular microcombustor

AUTHOR(S)
Jejurkar, S.; Mishra, D.
PUB. DATE
September 2012
SOURCE
Combustion, Explosion, & Shock Waves;Sep2012, Vol. 48 Issue 5, p497
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Self-sustainable combustion and narrow stability limits are the most critical issues in microcombustors (length scale 1 mm) as increased heat losses can lead to thermal quenching of the flame. Hydrogen is a potential fuel for microcombustion due to its high specific energy and wide flammability limits. This work focuses on the lean premixed hydrogen-air flames stabilized in a newly developed annular microcombustor. Detailed axisymmetric numerical calculations involving multistep kinetics, multicomponent mass-heat transport, conjugate heat transfer, and thermal radiation in gas and solid media are performed. It has been shown that flame stabilization occurs by preheating even though wall temperatures are higher than the autoignition temperature. Results unravel the importance of H radical reactions in the kinetics of microflames in low- and high-temperature regions of the microcombustor.
ACCESSION #
82472167

 

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