Optical determination of temperature and concentrations of homogeneous turbulent gas mixtures

Abstract

In this study, we present an inverse radiation model to reconstruct time-averaged temperature, species concentrations and their root mean square (rms) values for turbulent gas mixtures, based on line-of-sight spectral transmissivity measurements. Time-averaged transmissivities and their rms values are successfully related to timeaveraged temperatures, species concentrations and their rms values by considering interactions between turbulence and radiation (TRI). The turbulence length scale is retrieved simultaneously with the turbulent scalars. Optimal wavenumber ranges for retrieving temperature and species concentrations of the gas mixtures are discussed. To validate the models, measured spectra are synthesized by calculations from HITEMP 2010 for turbulent gas mixtures of CO 2 , H 2 O and CO.