Vabrational CARS thermometry in sooty flames; Quantitative evaluation of C sub 2 absorption interference

Journal Article · Thu Nov 01 00:00:00 EST 1990 · Combustion and Flame; (USA)

DOI:https://doi.org/10.1016/0010-2180(90)90098-C· OSTI ID:5758988

Bengtsson, P E; Alden, M; Kroll, S; Nilsson, D ^[1]

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1. Combustion Centre, Lund Institute of Technology, S-221 00 Lund (SE)

The application of nitrogen vibrational CARS thermometry to sooty, premixed, atmospheric pressure flames has been investigated using a Nd:YAG laser based system. It was found that laser-produced C{sub 2} radicals strongly absorb part of the fundamental band peak in the CARS spectrum. This was the most severe interference to the CARS signal. A quantitative investigation of temperature errors caused by the C{sub 2} absorption effect is presented. The correlation between the absorption interference and the soot volume fraction was examined for different flame conditions. Also, the increase of the nonresonant susceptibility in sooty flame regions is clearly illustrated and its effect on the evaluated temperature is quantitatively determined. The single-shot temperature standard deviation has also been investigated in flames with different soot loadings. Finally, other interference effects to the CARS signals in sooty flames are described and discussed.

• OSTI ID: 5758988
• Journal Information: Combustion and Flame; (USA), Vol. 82:2; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FLAMES
RAMAN SPECTRA
ABSORPTION SPECTRA
CARBON
NEODYMIUM LASERS
NITROGEN
SOOT
TEMPERATURE MEASUREMENT
ELEMENTS
LASERS
NONMETALS
SOLID STATE LASERS
SPECTRA
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry
400102 - Chemical & Spectral Procedures