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Experimental investigation of three-dimensional flame-front structure in premixed turbulent combustion—I: hydrocarbon/air bunsen flames

Chen, Yung-Cheng ; Bilger, Robert W

Combustion and Flame, 2002, Vol.131(4), pp.400-435 [Periódico revisado por pares]

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  • Título:
    Experimental investigation of three-dimensional flame-front structure in premixed turbulent combustion—I: hydrocarbon/air bunsen flames
  • Autor: Chen, Yung-Cheng ; Bilger, Robert W
  • Assuntos: Engineering ; Chemistry
  • É parte de: Combustion and Flame, 2002, Vol.131(4), pp.400-435
  • Descrição: OH concentrations and three-dimensional gradients of the reaction progress variable have been measured in turbulent liquefied petroleum gas/air and compressed natural gas/air premixed flames stabilized on a Bunsen-type burner with a combined two-sheet Rayleigh scattering and planar LIF-OH imaging technique. The progress variable is observed to undergo a transition from lamella-like to non-flamelet front structure with increasing turbulence. This is consistent with the recently proposed change of the combustion regimes from complex-strain to turbulent flame front regime on a recently proposed premixed combustion diagram. The anisotropy of local flame-front orientation in three-dimensional space is explained by the forward propagation ability of the planar turbulent flame brush. Weighting functions have thus been derived for the isotropic pdf distributions of the in-plane and out-of-plane orientation angles to agree better with the experimental data. A linear scaling is found between...
  • Idioma: Inglês

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