Accession Number : ADA247059


Title :   Advanced Diagnostics for Reacting Flows


Descriptive Note : Annual rept. 1 Oct 1990-31 Oct 1991


Corporate Author : STANFORD UNIV CA HIGH TEMPERATURE GASDYNAMICS LAB


Personal Author(s) : Hanson, R K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a247059.pdf


Report Date : 20 Nov 1991


Pagination or Media Count : 42


Abstract : Progress is reported for the past year of an interdisciplinary program aimed at establishing advanced optical diagnostic techniques applicable to combustion gases and plasmas, with some emphasis on high speed flows. The primary flowfield parameters of interest are species concentrations (including electrons), temperature, mass density, pressure, and velocity, and quantities derivable from these parameters such as mass flow rate (from the product of density and velocity). The techniques under study are based on laser spectroscopy, particularly laser absorption and laser-induced fluorescence, with the latter capable of providing both single-point and multi-point (2-d and 3-d) measurements. Laser sources include tunable cw lasers (ring dye and semiconductor diode lasers) and tunable pulsed lasers (excimer-pumped dye and narrow-linewidth excimer). The cw lasers are spectrally narrow, allowing study of a new class of techniques based on spectral lineshapes and shifts, while the pulsed lasers provide intense bursts of photons needed for techniques based on light-scattering phenomena. Accomplishments of note include: the first optical measurement of mass flux in high speed air flows; the first applications of tunable semiconductor diode lasers to absorption and fluorescence measurements in high temperature plasmas and supersonic flows, and to the measurement of water vapor in high temperature combustion gases; the first application of the planar laser-induced fluorescence (PLIF) technique to nonequilibrium shock tunnel flows; and further advances in the development of shock tube diagnostics for rate constant measurements of elementary combustion reactions. Laser, Imaging, Combustion, Velocity, Pressure, Temperature, Fluorescence, Reacting, Flow, Plasma.


Descriptors :   *LIGHT SCATTERING , *OPTICAL DETECTION , *PLASMAS(PHYSICS) , *DIAGNOSTIC EQUIPMENT , *COMBUSTION , VELOCITY , DIODES , MEASUREMENT , SPECTROSCOPY , AIR , VAPORS , HIGH TEMPERATURE , MASS FLOW , GASES , LASERS , SEMICONDUCTORS , PULSED LASERS , SEMICONDUCTOR DIODES , RATES , LIGHT , MASS , SHOCK TUNNELS , SHOCK TUBES , WATER VAPOR , ABSORPTION , DYES , FLOW , PHOTONS , PRESSURE , CONSTANTS , SHOCK , WATER , PARAMETERS , LASER INDUCED FLUORESCENCE , FLUORESCENCE , TEMPERATURE , SOURCES , DENSITY


Subject Categories : Test Facilities, Equipment and Methods
      Optical Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE