Measurement of radical species concentrations and polycyclic aromatic hydrocarbons in flames by fluorescence and absorption using a tunable dye laser. Progress report, March 1, 1982-February 28, 1985. [NH and CN radicals]

Technical Report · Fri Mar 01 04:00:00 EST 1985

OSTI ID:5893443

Salmon, J T; Peterson, D L; Nagy, P A; Laurendeau, N M

The primary goal of this research is to develop quantitative laser fluorescence methods for measuring the concentrations of radical species and polycyclic aromatic hydrocarbons (PAH's) in flames. The accuracy of the fluorescence techniques is evaluated through comparison with independent diagnostic methods. The applicability of the techniques over a range of flame conditions is evaluated by performing the fluorescence experiments in a flat flame burner operated at a variety of flame pressures, temperatures and equivalence ratios. Previously we have demonstrated quantitative laser-saturated fluorescence (LSF) measurements of OH concentration in hydrogen/oxygen/argon flames over wide ranges of flame pressure and stoichiometry. Over the current period of the grant we have (1) extended the OH analysis to atmospheric pressure methane-air flames under both clean and sooting conditions; (2) conducted LSF measurements of NH in a subatmospheric methane-nitrous oxide flame; (3) improved the calibration procedure used to obtain number densities from the fluorescence measurements; (4) investigated the effects of non-uniform laser illumination on LSF measurements; (5) detected hydrogen atom fluorescence in a flame using laser-induced two-photon absorption; (6) developed a technique for measuring the concentrations of PAH's in vapor state mixtures; and (7) initiated the application of LSF to measurements of CN. 15 references, 7 figures, 1 table.

• Research Organization: Purdue Univ., Lafayette, IN (USA). School of Mechanical Engineering
• DOE Contract Number: AC02-78ER04939
• OSTI ID: 5893443
• Report Number(s): DOE/ER/04939-7; COO-4939-7; ON: DE85008624
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKANES
ARGON
AROMATICS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COMBUSTION
DATA
DYE LASERS
ELEMENTS
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
FLAMES
FLUIDS
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
GASES
HYDROCARBONS
HYDROGEN
HYDROXYL RADICALS
INFORMATION
LASERS
LIQUID LASERS
LUMINESCENCE
METHANE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLYCYCLIC AROMATIC HYDROCARBONS
RADICALS
RARE GASES
SPECTROSCOPY
THERMOCHEMICAL PROCESSES