Accession Number : ADA190485

Title :   Advanced Diagnostics for Reacting Flows.

Descriptive Note : Annual rept. 1 Oct 86-30 Sep 87,

Corporate Author : STANFORD UNIV CA HIGH TEMPERATURE GASDYNAMICS LAB

Personal Author(s) : Hanson, R K

PDF Url : ADA190485

Report Date : 30 Oct 1987

Pagination or Media Count : 53

Abstract : Progress is reported for the past year of an interdisciplinary program to establish advanced optical diagnostic techniques applicable to combustion and plasma flows. The primary effort is on digital flowfield imaging techniques, which offer significant potential for a wide range of spatially resolved 2-d and 3-d measurements. The imaging is accomplished by recording light scattered from a planar laser-illuminated region using a modern solid-state camera. The scattering process is generally laser-induced fluorescence, though Mie scattering is also used in connection with sizing particles. Activities reported herein include: (1) single-photon fluorescence imaging of molecular oxygen; (2) two-photon fluorescence imaging of CO and H2O; (3) photofragmentation-based fluorescence imaging; (4) mutiple particle sizing by imaging of Mie-scattered light; (5) fluorescence-based velocity and pressure imaging; (6) 3-d imaging; (7) laser and solid-state camera development; and (8) processing/display of image data using a specialized image computer. Other diagnostics topics discussed in this report include research on laser wavelength modulation spectroscopy and development of plasma diagnostics based on laser-induced fluorescence and Stark broadening. Finally, initial work to develop a laser photolysis shock tube, for fundamental studies of chemical kinetics and spectroscopy in high temperature gases, is described.

Descriptors :   *LASER INDUCED FLUORESCENCE, *MIE SCATTERING, *PLASMA DIAGNOSTICS, *REACTIVE GASES, *COMBUSTION CHAMBER GASES, CAMERAS, COMBUSTION, COMPUTERS, DIAGNOSIS(GENERAL), FLOW, FREQUENCY MODULATION, GASES, HIGH TEMPERATURE, ILLUMINATION, IMAGES, METHODOLOGY, OPTICS, OXYGEN, PARTICLE SIZE, PHOTOLYSIS, PLANAR STRUCTURES, PLASMAS(PHYSICS), PRESSURE, PROCESSING, RANGE(EXTREMES), REACTION KINETICS, SCATTERING, SHOCK TUBES, SOLID STATE ELECTRONICS, SPECTROSCOPY, TUBES

Subject Categories : Physical Chemistry
      Fluid Mechanics
      Plasma Physics and Magnetohydrodynamics
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE