Accession Number : ADA299535

Title :   Advanced Diagnostics for Reacting Flows.

Descriptive Note : Final rept. 1 Oct 90-31 Oct 94,

Corporate Author : STANFORD UNIV CA HIGH TEMPERATURE GASDYNAMICS LAB

Personal Author(s) : Hanson, R. K.

PDF Url : ADA299535

Report Date : 12 JAN 1995

Pagination or Media Count : 148

Abstract : Progress is summarized for the past four years of a research program on advanced diagnostic techniques for combustion gases and plasmas. The parameters of interest are species concentrations, temperature, density, pressure, velocity, mass flow rate and thrust. The techniques studied are based on laser spectroscopy, particularly laser absorption and laser-induced fluorescence. Sources include tunable cw diode lasers and tunable pulsed lasers. The cw lasers are spectrally narrow, allowing study of new 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 use of diode lasers for absorption and fluorescence measurements in combustion gases and plasmas; development of an optical diagnostic for mass flux and thrust; the first use of laser absorption to monitor atomic nitrogen and oxygen; development of wavelength-multiplexing to allow multiple-species absorption measurements along a common optical path; demonstration of quantitative PLIF methods for temperature and velocity imaging in supersonic flows; development of acetone seeding for improved PLIF imaging; and the first application of PLIF to shock tunnel flows.

Descriptors :   *LASER INDUCED FLUORESCENCE, *PLASMAS(PHYSICS), *COMBUSTION PRODUCTS, VELOCITY, LIGHT SCATTERING, TUNABLE LASERS, ELECTRON DENSITY, SEMICONDUCTOR LASERS, HIGH PRESSURE, OPTICAL IMAGES, SEMICONDUCTOR DIODES, PULSED LASERS, FLOW VISUALIZATION, FOUR WAVE MIXING, GAS DYNAMICS, NITROGEN, OXYGEN, MASS FLOW, FLOW RATE, DIAGNOSIS(GENERAL), ABSORPTION SPECTRA, COMBUSTION STABILITY, SUPERSONIC FLOW, MULTIPLEXING, ACETONES, ENTHALPY, CONTINUOUS WAVE LASERS, PLASMA DIAGNOSTICS, HIGH SPEED PHOTOGRAPHY, SHOCK TUNNELS.

Subject Categories : Lasers and Masers
      Plasma Physics and Magnetohydrodynamics
      Combustion and Ignition
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE