Flamelet characteristics at the leading edge and through the flame brush of statistically steady incompressible turbulent premixed flames

Kwon, Jun-Young; Park, Yeongdo; Huh, Kang Y.

doi:10.1016/j.combustflame.2015.11.003

Cited by 8 publications

(1 citation statement)

References 31 publications

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“…In this respect, it is worth mentioning that probability density function (PDF) models of scalar mixing requires the expected values of the molecular fluxes conditional upon the scalar value [12] and the micro-mixing term must be modeled; the curvature-related diffusion must be described in terms of calculable statistical moments, or, alternatively, a rigorous criteria to neglect it must be proposed. In addition, the flame curvature affects both the leading edge and flamelet characteristics in statistically steady incompressible turbulent premixed flames [43]. Moreover, curvature contributions can dominate diffusion rates and displacement speed for ignition kernels of small radii [44,45] and determine their probability of survival.…”

Section: Introductionmentioning

confidence: 99%

Analysis of flame curvature evolution in a turbulent premixed bluff body burner

et al. 2018

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The physical mechanisms responsible for flame curvature evolution of a methane-air premixed flame attached to a bluff-body burner have been investigated using a high-fidelity flame-resolved three-dimensional simulation database. The contributions to the mean curvature generation due to the fluid flow motion and to a combination of flow and flame propagation induced strain rates have been analyzed in detail and dominant contributions in different zones (reactants, flame and products) of the flame have been identified. The effect of fluid flow on the mean curvature evolution is important on the unburned gas side, whereas the flame propagation dominates the mean curvature evolution in the reaction region and towards the hot products. The statistical contributions of the mean curvature transport equation have been analysed in terms of the iso-scalar surface geometry, characterized by the mean and Gauss curvatures. This information has subsequently been used to provide physical insights into the dominant mechanisms of curvature evolution for different flame topologies.

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