Simultaneous temperature and multi-species measurement in a lifted hydrogen diffusion flame by a KrF excimer laser
An ultraviolet spontaneous vibrational Raman scattering technique has been developed and applied to a lifted hydrogen jet diffusion flame. Simultaneous, temporally and spatially resolved point measurements of temperature, major species concentrations (H{sub 2}, O{sub 2}, N{sub 2}, H{sub 2}O), and absolute hydroxyl radical concentration (OH) are obtained with a single excimer laser for the first time. For OH measurement, the use of laser-induced predissociative fluorescence makes quenching corrections unnecessary. In the center core of the lifted flame base, fuel and oxidizer are rich, premixed, and unignited. Combustion occurs in an intermittent annular turbulent flame brush with strong finite-rate chemistry effects. The OH radical exists in subequilibrium and superequilibrium concentrations. Major species and temperature are found with nonequilibrium values. Further downstream the superequilibrium OH radicals decay toward equilibrium through slow three-body recombination reactions. 32 refs.
- OSTI ID:
- 6377768
- Report Number(s):
- AIAA-Paper--91-0181; CONF-910117--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
083000* -- Hydrogen-- Combustion-- (1990-)
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMBUSTION PROPERTIES
ELEMENTS
EXCIMER LASERS
FLAMES
FUELS
GAS LASERS
HYDROGEN COMPOUNDS
HYDROGEN FUELS
HYDROXYL RADICALS
KINETICS
KRYPTON FLUORIDE LASERS
LASERS
MEASURING METHODS
NITROGEN
NONMETALS
OXYGEN COMPOUNDS
QUANTITY RATIO
RADICALS
RAMAN SPECTRA
REACTION KINETICS
SPECTRA
SYNTHETIC FUELS
TEMPERATURE MEASUREMENT
WATER