The spontaneous Raman scattering technique applied to nonpremixed flames of methane

Journal Article · Sun Mar 01 00:00:00 EST 1987 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(87)90095-2· OSTI ID:6985086

Dibble, R W; Masri, A R; Bilger, R W

Simultaneous space- and time-resolved measurements of the concentrations of CH/sub 4/, O/sub 2/, N/sub 2/, H/sub 2/O, H/sub 2/, CO, and CO/sub 2/ have been made using spontaneous Raman scattering, in the blue regions of CH/sub 4/ turbulent nonpremixed flames. The temperature is measured from the Rayleigh scattered signal. A ''fluorescence'' interference, which is broadband and contaminates in varying degrees the Rayleigh and all the Raman lines, is believed to be due to a number of molecules or flame radicals, including C/sub 2/ and CN or even incandescence of small particle nuclei. The ''fluorescence'' has been monitored at a bandhead of C/sub 2/(516.5 nm) and its effect reduced by placing a Polaroid filter at the entrance slit of the spectrometer. The remaining ''fluorescence'' has been corrected for, using correction curves generated from measurements made in a laminar counterflow CH/sub 4/ diffusion flame and a diluted CH/sub 4//N/sub 2/ = 1/2 (by vol.) laminar diffusion flame. Measurements of CO and CO/sub 2/ are not reliable in the rich regions of the flame where the ''fluorescence'' is intense. With minor modifications to the optical system, CO and CO/sub 2/ could also be measured with acceptable accuracy in regions of intense ''fluorescence'' and the ''fluorescence'' correction further refined. This work is considered to be an important extension of the applications of spontaneous Raman scattering as a measurement technique in flames.

• Research Organization: Sandia National Labs., Livermore, CA
• OSTI ID: 6985086
• Journal Information: Combust. Flame; (United States), Vol. 67:3
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FLAMES
RAMAN EFFECT
METHANE
COMBUSTION KINETICS
ACCURACY
CARBON DIOXIDE
CARBON MONOXIDE
FLAME PROPAGATION
FLUORESCENCE
HYDROGEN
NITROGEN
OPTICAL FILTERS
OXYGEN
QUANTITY RATIO
RAYLEIGH SCATTERING
SPATIAL RESOLUTION
SPECTROMETERS
TEMPERATURE MEASUREMENT
TIME RESOLUTION
WATER
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COHERENT SCATTERING
ELEMENTS
FILTERS
HYDROCARBONS
HYDROGEN COMPOUNDS
KINETICS
LUMINESCENCE
MEASURING INSTRUMENTS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
RESOLUTION
SCATTERING
TIMING PROPERTIES
034000* - Natural Gas- Combustion
400102 - Chemical & Spectral Procedures
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry