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Simultaneous temperature and multispecies measurement in a lifted hydrogen diffusion flameUV spontaneous vibrational Raman scattering and laser-induced predissociative fluorescence (LIPF) techniques are combined and applied to a lifted hydrogen jet diffusion flame. Simultaneous, temporally and spatially resolved point measurements of temperature, major species concentrations (H2, O2, N2, H2O), and absolute hydroxyl radical concentration (OH) are obtained with a 'single' excimer laser for the first time. For OH measurements, the use of LIPF makes quenching corrections unnecessary. Results demonstrate that fuel and oxidizer are in a rich, premixed, and unignited condition in the center core of the lifted flame base. In the lifted zone, combustion occurs in an intermittent annular turbulent flame brush and strong finite-rate chemistry effects result in nonequilibrium values of temperature, major species, and OH radicals. Downstream in the slow three-body recombination zone, the major species concentrations are in partial equilibrium, the OH concentrations are in superequilibrium, and the temperatures are in subequilibrium. Far downstream in the flame, equilibrium values of temperature, OH radical, and major species are found.
Document ID
19930032661
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Cheng, T. S.
(NASA Headquarters Washington, DC United States)
Wehrmeyer, J. A.
(NASA Headquarters Washington, DC United States)
Pitz, R. W.
(Vanderbilt Univ. Nashville, TN, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1992
Publication Information
Publication: Combustion and Flame
Volume: 91
Issue: 4-Mar
ISSN: 0010-2180
Subject Category
Inorganic And Physical Chemistry
Accession Number
93A16658
Funding Number(s)
CONTRACT_GRANT: NAG1-770
CONTRACT_GRANT: NSF CTS-86-57130
CONTRACT_GRANT: NGT-50263
Distribution Limits
Public
Copyright
Other

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