Accession Number : ADA118576

Title :   Applications of Rayleigh Scattering to Turbulent Flows with Heat Transfer and Combustion.

Descriptive Note : Final rept. 1 Mar 80-30 Apr 82,


Personal Author(s) : Talbot,L ; Robben,F

PDF Url : ADA118576

Report Date : 18 May 1982

Pagination or Media Count : 18

Abstract : Rayleigh scattering has been developed as a diagnostic tool and used in conjunction with Laser Doppler velocimetry to study two reacting flows; the interaction of a Karman vortex street with a flame, and the interaction of grid-produced turbulence with a flame. Vortex street interaction is characterized by radical distortion of the flame front. Dilatation effects downstream of the flame front dominate, and vortices are not discernible in this region. Numerical modeling gave qualitative agreement with the experimental results. For the grid-induced turbulence, the measured density and velocity statistics were compared with the predictions of the Bray-Moss-Libby model. It was found that intermediate states had to be taken into account. Two-point density correlation measurements, the first ever reported, showed that the length scales of turbulence within the reaction zone were the same in all three orthogonal directions. Space-time correlation measurements in the flow direction were in accord with the Taylor hypothesis. (Author)

Descriptors :   *Rayleigh scattering, *Turbulent flow, *Flame propagation, *Combustion, Heat transfer, Laser velocimeters, Doppler systems, Density, Velocity, Diagnosis(General), Correlation techniques, Measurement, Chemical radicals, Mathematical models

Subject Categories : Fluid Mechanics
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE