Rayleigh/Raman/LIF measurements in a turbulent lean premixed combustor

Technical Report · Wed May 01 04:00:00 EDT 1996

OSTI ID:225981

Nandula, S P; Pitz, R W ^[1]; Barlow, R S; Fiechtner, G J ^[2]

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1. Vanderbilt Univ., Nashville, TN (United States). Dept. of Mechanical Engineering
2. Sandia National Labs., Livermore, CA (United States). Combustion Research Facility

Simultaneous, time resolved measurements of major species (CH{sub 4}, O{sub 2}, N{sub 2}, H{sub 2}, H{sub 2}O, and CO{sub 2}), temperature, OH, NO, and CO are obtained in turbulent lean premixed methane-air flames, using a combination of Rayleigh scattering, spontaneous Raman scattering, and laser induced fluorescence (LIF). The measurements are performed in a bluff-body stabilized turbulent combustor burning premixed methane/air at an equivalence ratio of 0.586.Results show that the combustion in the recirculation zone is nearly complete and the reaction progress variable based on temperature {l_brace}(T - T{sub 0})/(T{sub ad} - T{sub 0}){r_brace} is 0.92. Radial profiles of species concentrations and temperature are uniform at all downstream locations in the recirculation zone. The species concentrations and temperature in the exhaust plane of the combustor (6 diameters downstream) are at adiabatic equilibrium. The NO concentrations in the exhaust plane of the combustor are small ({approximately} 6 ppm), however the CO concentrations are relatively large ({approximately} 1,500 ppm). In the exhaust plane of the combustor, pollutants (NO and CO) are also measured with gas sampling probes. The probe and optical measurements of NO are in agreement, but the CO measurements with an uncooled gas sampling probe are about 10 times smaller than the optical measurements.

• Research Organization: Vanderbilt Univ., Nashville, TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FC21-92MC29061
• OSTI ID: 225981
• Report Number(s): DOE/MC/29061--96/C0684; CONF-960162--5
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
40 CHEMISTRY
AIR POLLUTION ABATEMENT
CALIBRATION
CARBON DIOXIDE
CARBON MONOXIDE
COMBUSTION KINETICS
EXPERIMENTAL DATA
FLAMES
FLUORESCENCE SPECTROSCOPY
GAS ANALYSIS
GAS TURBINE ENGINES
HYDROGEN
HYDROXYL RADICALS
LASER SPECTROSCOPY
METHANE
NITRIC OXIDE
NITROGEN
OXYGEN
RAMAN SPECTROSCOPY
TEMPERATURE MEASUREMENT
WATER VAPOR