Velocity-Density Correlations and Favre Averages Measured in a Premixed Turbulent Flame

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Abstract
Laser velocimetry and Rayleigh scattering diagnostics are applied simultaneously to measure velocity-density correlations, Favre averaged velocities, and the conditioned velocities of reactants and products in a premixed turbulent flame. Details of the experimental procedure are described, as well as the effects of velocity biasing. The flamelets within the flame are visualized and a significant amount of “flame generated turbulence” is measured. A number of assumptions in the Bray-Moss-Libby theory are found to be valid which is in agreement with several previous experiments that employed different diagnostics. However, one difference between the measurements and theory is that the velocity PDF of products is found to be non-Gaussian because a significant amount of low speed products exist within the flame. The low speed products are believed to be due to non-uniform acceleration induced by the curved flamelets that are observed. This non-uniform acceleration appears to represent an additional source of turbulence within the flame and contributes to flame generated turbulence.

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