ARTICLE:

• TEMPERATURE AND SPECIES CONCENTRATION PROFILES USING HIGH RESOLUTION INFRARED TRANSMISSION DATA BY INVERSE RADIATIVE ANALYSIS  download article

Farchid Yousefian
Laboratoire d'Etudes Thermiques, (U.M.R 6608 C.N.R.S) Ecole Nationale Superieure de Mecanique et Aerotechnique, 86960 Poitiers, Futuroscope Cedex, France

M. Lallemand
LET, UMR CNRS 6608, ENSMA, 86960 Futuroscope, FRANCE

ABSTRACT

The presented paper deals with the restitution of temperature and species concentration profiles in a flame from high resolution infrared synthetic data by means of inverse radiative methods. The inverse problem is performed in a one-dimensional axisymmetric geometry for transmission or emission data stemming from a given cross-section of the semi-transparent object. Applications are concerning pollutants of combustion gases (CO) in a premixed flame. In transmission, the observation of two lines of a diatomic molecules belonging to the same lower and same upper vibrational states is simulated and inversions are carried out from the ratio of high resolution line intensity data. The microscopic expression of the absorption coefficient for ro-vibrational lines in terms of local species and temperature distributions is developed. The domain of validity of assumptions which renders possible the inversion of transmission data with respect to line intensity is discussed.
This high resolution inverse technique proceeds by a generalized Abel transform developed by Simmoneau et al. The recovered results are compared with those obtained from ordinary Abel inversion and the conjugated gradient technique.

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