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NEAR-INFRARED EMISSION SPECTROMETRY MEASUREMENTS FOR NONINTRUSIVE SOOT DIAGNOSTICS IN FLAMES

DOI: 10.1615/ICHMT.2007.RadTransfProc.460
page 11

Isil Ayranci
Department of Chemical Engineering, Middle East Technical University, 06531 Ankara, TURKEY; Centre de Thermique de Lyon (CETHIL CNRS-INSA Lyon-UCBL), Bât. Sadi Carnot, INSA-Lyon, F-69621, France

Rodolphe Vaillon
Centre de Thermique de Lyon (CETHIL, CNRS/INSA Lyon/UCBL), Domaine Scientifique de La Doua, 20 av. A. Einstein, 69621 Villeurbanne Cedex, France

Nevin Selcuk
Chemical Engineering Department, Middle East Technical University, 06531 Ankara, Turkey


SCHLÜSSELWÖRTER: soot, tomography, diagnostics, FTIR, spectroscopy, diffusion flames, noise, calibration

Abstrakt

Present study focuses on measurement of line-of-sight emission intensity spectra in the near-infrared range by Fourier Transform Infrared spectrometry for use in tomographic soot diagnostics. Measurements were carried out on an axisymmetric, laboratory grade, ethylene/air diffusion flame within 1.1−1.7 μm (9000−6000 cm−1) spectral range. Description of the measurement and calibration methodology is followed by description of noise and uncertainty assessment procedures. A novel noise characterization approach which accounts for both spectral and spatial fluctuations was introduced. Measured intensities were utilized to infer soot temperature and volume fraction profiles from an inversion technique based on gray refractive index assumption. Predictions at flame axis are found to be in reasonable agreement with properties reported in literature for similar flames but steep volume fraction peaks at the flame edges are not sufficiently captured due to expected effects of large beam diameter, suggesting that present configuration requires improvement in terms of spatial resolution.

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