Applications of Rayleigh scattering to turbulent flows with heat transfer and combustion

The instrumentation and data processing techniques to apply single channel Rayleigh scattering and laser Doppler anemometry to turbulent premixed combustion has been completed. The propagation of a flame in a grid-generated turbulent and in otherwise laminar flow containing a Karman vortex street generated by a rod have been investigated. Three reports describing this work have been completed and are in the process of publication. The ratio of turbulent length scale to laminar flame thickness and the turbulent intensity predict that the wrinkled laminar flame model should be valid for the physical structure of the turbulent flame. The results appear to be in agreement with this model. They also indicate: reduction of turbulent intensities behind the flame and no evidence of combustion generated turbulence, appreciable volume of intermediate states (partially burned gas) in the combustion zone, perturbation and increase of the upstream turbulence flame, interference of the rod flame-holder wake with the flame for small angles of the flame front to the flow, and apparent disappearance of rod-generated vortices behind the flame.