Abstract
The interaction of grid-generated turbulence with premixed, V-shaped ethylene/air flames has been studied using laser Doppler anemometry and Rayleigh scattering as optical diagnostics, respectively, for the streamwise component of elocity and the density. Turbulent flame propagation was studied for three upstream flow velocities, U ∞ = 245, 500, and 684 cm/s with fuel/air equivalence ratios ranging from 0.55 to 0.75. The angle of the flame with the flow axis was varied from 12° to 24°. Profiles of mean values and the turbulence intensity of velocity and density were obtained through the flame. For all conditions, the turbulence intensity of velocity was observed to decrease behind the flame, indicating the dominance of dilatation effects. In addition, profiles of the mean streamwise velocity component indicate streamlines to be significantly deflected at the flame for the case of the most oblique flame. For the conditions in which the flame angle was 12°, the wake of the flame holder dominates the flow field behind the flame and vortices are observed. This suggests that results for these conditions are not typical of the interaction of a flame with grid-induced turbulence. Probability density functions of Rayleigh scattering in the flame and turbulent intensities indicate that intermediate states of chemical species are likely to be significant in determining density statistics.
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