Burning velocity in a turbulent stream of a homogeneous mixture

Kozachenko, L. S.; Kuznetsov, I. L.

doi:10.1007/bf00757148

Cited by 26 publications

(1 citation statement)

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“…Experimental setups to measure S T differ from one study to another, and many challenges remain-unsteadiness and inhomogeneity of the flow, influence of the ignition source on the flame propagation, difficulties in quantifying heat losses and length scales-leading to a large scattering in the dataset of the latter for a fixed root-mean-square (rms) velocity to laminar flame velocity ratio, u ′ /S L ; an accurate measurement of S T is still difficult (see e.g., [3,4] and references therein). Considering the correlation of the ratio of turbulent to laminar burning velocities S T /S L and u ′ /S L [5], old experimental data reveal a steady linear increase of S T /S L with u ′ /S L [6] for the higher range of turbulence Reynolds number Re t = u ′ l t /ν, where l t is the integral length scale and ν is the kinematic viscosity. This is contrary to the seminal investigations in, for instance, [2,7] for a lower range of Re t .…”

Section: Introductionmentioning

confidence: 99%

Impact of Turbulence Intensity and Equivalence Ratio on the Burning Rate of Premixed Methane–Air Flames

Fru¹,

Thévenin²,

Janiga³

2011

Energies

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Direct Numerical Simulations (DNS) have been conducted to study the response of initially laminar spherical premixed methane-air flame kernels to successively higher turbulence intensities at five different equivalence ratios. The numerical experiments include a 16-species/25-step skeletal mechanism for methane oxidation and a multicomponent molecular transport model. Highly turbulent conditions (with integral Reynolds numbers up to 4 513) have been accessed. The effect of turbulence on the physical properties of the flame, in particular its consumption speed S c , which is an interesting measure of the turbulent flame speed S T has been investigated. Local quenching events are increasingly observed for highly turbulent conditions, particularly for lean mixtures. The obtained results qualitatively confirm the expected trend regarding correlations between u ′ /S L and the consumption speed: S c first increases, roughly linearly, with u ′ /S L (low turbulence zone), then levels off (bending zone) before decreasing again (quenching limit) for too intense turbulence. For a fixed value of u ′ /S L , S c /S L varies with the mixture equivalence ratio, showing that additional parameters should probably enter phenomenological expressions relating these two quantities.

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