Detailed structure study of a low pressure, stoichiometric H[sub 2]/N[sub 2]O/Ar flame
- Army Research Lab., Aberdeen, MD (United States)
A combined experimental and detailed chemical modeling study has been performed on a 20 torr, stoichiometric H[sub 2]/N[sub 2]O/Ar burner stabilized flame. Species concentration profiles were measured using molecular beam sampling with mass spectrometric detection and laser-induced fluorescence, while temperature profiles were measured with coated Pt/Pt-Rh(10%) thermocouples. The burned gases of the flame contain about 2 mol.% of NO and H[sub 2], a concentration of approximately ten times more than that of their equilibrium. This formation prevents full energy release of the system within or near the flame zone. Experimental flame profiles of the major species, H[sub 2], N[sub 2]O, N[sub 2], and H[sub 2O], as well as the minor species, NO, O[sub 2], OH, H, O, and NH, are presented and compared to calculated profiles generated by PREMIX, a one-dimensional premixed laminar flame code. The chemical mechanism used in the flame code was derived from a critical literature review and consists of 38 reactions and 14 species. Rate and sensitivity analyses performed reveal the intricacies of the mechanism as well as reactions important in the modeling of the experimental results. Several key reactions, including N[sub 2]O + OH = HO[sub 2] + N[sub 2] and N[sub 2]O + H = NO + NH, whose rate coefficients have been controversial, are discussed in detail. In addition, the importance of various collision partners in the key initiation step, N[sub 2]O + M = N[sub 2] + O + M, is presented and discussed.
- OSTI ID:
- 6130914
- Journal Information:
- Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 94:4; ISSN CBFMAO; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparisons of the structure of stoichiometric CH sub 4 -N sub 2 O-Ar and CH sub 4 O sub 2 -Ar flames by molecular beam sampling and mass spectrometric analysis
Experimental and modeling studies of a rich H{sub 2}/CO/N{sub 2}O/Ar flame
Related Subjects
083000 -- Hydrogen-- Combustion-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ARGON
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION KINETICS
COMPUTER CODES
DISPERSIONS
ELEMENTS
FLAMES
FLUID FLOW
FLUIDS
FLUORESCENCE
FUELS
GAS ANALYSIS
GASES
HYDROGEN FUELS
KINETICS
LAMINAR FLOW
LUMINESCENCE
MASS SPECTROSCOPY
MATHEMATICAL MODELS
MIXTURES
MORPHOLOGY
NITRIC OXIDE
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
ONE-DIMENSIONAL CALCULATIONS
OXIDES
OXYGEN COMPOUNDS
P CODES
PROPELLANTS
RADICALS
RARE GASES
REACTION KINETICS
SPECTROSCOPY
SYNTHETIC FUELS
TEMPERATURE DISTRIBUTION
VAPORS
WATER VAPOR