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Rayleigh Light Scattering for Concentration Measurements in Turbulent Flows.

pdf icon Rayleigh Light Scattering for Concentration Measurements in Turbulent Flows. (893 K)
Pitts, W. M.

National Aeronautics and Space Administration/Lewis Research Center. Rayleigh Scattering Diagnostics Workshop. Scientific and Technical Information Program. NASA Conference Publication 10186. July 25-26, 1995, Cleveland, OH, 69-87 pp, 1996.


light scattering; concentration measurements; concentration fluctuations; flow fields; flow measurement; line cameras; rayleigh light scattering; turbulent jets; axisymmetric jets; scalar dissipation


Despite intensive research efforts over a number of years, an understanding of scalar mixing in turbulent flows remains elusive. An understanding is required because turbulent mixing has a pivotal role in a wide variety of natural and technologically important processes. As an example, the mixing and transport of pollutants in the atmosphere and bodies of water are often dependent on turbulent mixing processes. Turbulent mixing is also central to turbulent combustion which underlies most hydrocarbon energy utiliztion in modern socities as well as unwanted fire behavior. Development of models for combusting flows is crucial for more efficient utilization of limited hydrocarbon fuel resources, reduction in environmentally harmful pollutants, more efficient chemical processes, and for the prediction of hazard associated with unwanted fire. However, an understanding of scalar mixing is required before useful models of turbulent mixing and, ultimately, turbulent combustion can be developed.