Accession Number:



Nonlinear Spectroscopy of Multicomponent Droplets and Two- and Three Dimensional Measurements in Flames.

Descriptive Note:

Final technical rept. 1 Feb 91-31 Jan 94,

Corporate Author:


Personal Author(s):

Report Date:


Pagination or Media Count:



Significant progress has been made in the following two research areas L Nonlinear spectroscopy of micrometer-sized multicomponent droplets and II. Two- and three-dimensional scalar and velocity mapping. I. Chemical species and physical properties of multicomponent liquid droplets in a spray combuster can be determined by a nonintrusive in-situ optical diagnostics techniques. A brief summary of the research accomplishments in the three areas related to the nonlinear optical interactions inside micron-sized droplets and the applications of such spectroscopy to determine the chemical and physical properties of the droplets 1 Model for Nonlinear Optical Processes in Droplets, 2 Fluorescence Seeding of Simulated Raman Scattering SRS of the Minority Species, and 3 Detection of Slight Shape Distortion by Spectroscopic Means. II. A review of the progress in our multi-dimensional scalar and velocity measurements in turbulent flames is also given. Among the accomplishments during the funding period are the following 1 Scalar field measurements of differential diffusion effects in turbulent flows 2 Development of a digital particle image velocimetry PIV technique for velocity field measurements in reacting and nonreacting flows 3 Combination of the new digital PIV technique with previously developed fluorescence imaging techniques to allow simultaneous vector and scalar imaging in turbulent flames, and 4 Development of new mixture fraction imaging techniques for studying turbulent nonpremixed hydrocarbon flames. Multicomponent droplets, Nonlinear optical effect, Lasing, Stimulated Raman scattering, Evaporation, Shape distortion, Interacting droplets, Particle image velocimetry, Flow and flame imaging, Laser diagnostics, Mixture fraction.

Subject Categories:

  • Physical Chemistry
  • Fluid Mechanics
  • Optics
  • Combustion and Ignition

Distribution Statement: