Abstracts

Topic: Y. R. Sivathanu, M. E. Kounalakis, and G. M. Faeth (1990),

“Soot and Continuum Radiation Statistics of Luminous Turbulent Diffusion Flames,”

Twenty-third Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, pp. 1543-1550.

The statistics of soot and spectral radiation intensities in the continuum were measured for horizontal radiation paths through the axis of highly-buoyant propylene flames burning in still air. Radiation statistics were also analyzed using a stochastic simulation of soot properties that matched soot statistics along the radiation path. Predictions and measurements of radiation statistics were generally in good agreement, aside for difficulties in predicting spikes of the measured PDF’s and temporal power spectra due to release of coherent structures near the source for low burner Reynolds numbers. Radiation fluctuation intensities up to 100 percent were observed while temporal power spectra decayed proportional to the –5/3 power of frequency at high frequencies, suggestion strong turbulent/radiation interactions and a close relationship between turbulent mixing and continuum radiation statistics in turbulent flames.