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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

OPTICAL DETERMINATION OF TEMPERATURE AND SPECIES CONCENTRATION FOR HOMOGENEOUS TURBULENT GAS MEDIUM

DOI: 10.1615/TFESC1.cbf.012546
pages 95-109

Tao Ren
School of Engineering, University of California, Merced, California 95343

Michael F. Modest
School of Engineering, University of California, Merced, USA


KEY WORDS: turbulence, radiation, temperature, concentration, transmissivity

Abstract

In this study, we present an inverse calculation model to reconstruct time-averaged temperature, species concentration and their root mean square (rms) values from optical measurements for a homogeneous turbulent gaseous medium. The model is based on line-of-sight spectral transmissivity measurements, and time-averaged transmissivities and their rms values are successfully related to time-averaged temperatures, species concentrations and their rms values by considering interaction between turbulence and radiation (TRI). The turbulence length scale is also retrieved simultaneously with the turbulent scalars. In order to validate the model, a stochastic approach is used to generate synthetic turbulent fields (fluctuations of temperature and species concentration), and measured spectra are synthesized through calculations from HITEMP 2010 for different spectral bands of CO2, H2O and CO.

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