Accession Number : ADA326207

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

Descriptive Note : Final rept. 1 Feb 94-31 Jan 97,

Corporate Author : YALE UNIV NEW HAVEN CT DEPT OF APPLIED PHYSICS

Personal Author(s) : Chang, Richard K. ; Long, Marshall B.

PDF Url : ADA326207

Report Date : 22 APR 1997

Pagination or Media Count : 23

Abstract : Significant progress has been made in the following two research areas: (1) Nonlinear spectroscopy of micrometer-sized multicomponent droplets; and (2) Two- and three-dimensional scalar and velocity mapping. Optical diagnostics that have the potential of providing information on chemical species and temperature of multicomponent liquid droplets have been developed. A brief summary of the research accomplishments in the following three areas: (1) droplet temperature determination with thermochromic dyes; (2) enhancement of stimulated Raman scattering from droplets for identifying chemical species; and (3) modification of droplet lasing characteristics by injection seeding and Q-switching. Progress has been made in developing and applying a technique for obtaining mixture fraction and scalar dissipation in a variety of turbulent nonpremixed flames. The data from these experiments are of use for modeling these complex systems. In premixed flames, simultaneous velocity/scalar images were obtained, along with full three-dimensional gradient and OH information.

Descriptors :   *RAMAN SPECTROSCOPY, *LASER APPLICATIONS, *FLAME PROPAGATION, LASER CAVITIES, LIGHT SCATTERING, SOLUTIONS(MIXTURES), TWO DIMENSIONAL, TURBULENT FLOW, NONLINEAR OPTICS, THREE DIMENSIONAL, FUEL AIR RATIO, COMBUSTION STABILITY, THERMOCHROMIC MATERIALS, TURBULENT DIFFUSION.

Subject Categories : Lasers and Masers
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE