Abstract
To explore the influence mechanism of initial turbulence on propagation speed of wrinkled flames, the turbulent combustion behavior of wrinkled stoichiometric hydrogen premixed flames was studied in a spherical fanstirred closed vessel under standard temperature and pressure. The variations on flame structure were first observed; turbulent flames first were distorted and then became cellular, and both first and second critical flame radii of cellularity declined with a increased rate as turbulent intensity rose. Then, the variations of stretch effects were compared to laminar flame; the global stretch rate on turbulent flame at a same flame size was raised while the enhancement extent was obviously enlarged with the increase of initial turbulent intensity and/or the growth of flame size. Finally, the variation regulations of propagation speed induced by varying turbulent intensity were analyzed; the nexus between propagation speed and initial turbulence was discussed with the considerations of cellularity phenomenon and stretch effects.
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The paper will be reported in the 11th China-Korea Clean Energy Workshop.
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Sun, ZY., Li, GX. Propagation speed of wrinkled premixed flames within stoichiometric hydrogen-air mixtures under standard temperature and pressure. Korean J. Chem. Eng. 34, 1846–1857 (2017). https://doi.org/10.1007/s11814-017-0084-3
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DOI: https://doi.org/10.1007/s11814-017-0084-3