H2 vibrational spectral signatures in binary and ternary mixtures: theoretical model, simulation and application to CARS thermometry in high pressure flames

Abstract

A summary of the main results obtained by the two groups in the field of H₂ vibrational spectral line signatures for various mixtures, in connection with CARS diagnostics of H₂–O₂ combustion systems, is presented. H₂–X systems may have specific large inhomogeneous spectral features, due to the dependence of the line broadening and line shifting on the (H₂) radiator speed, particularly at high temperature. Thus, careful attention has to be paid to rigorously analyze such features, both from the experimental point of view (Dijon) and from the theoretical one (Besançon). Applications of the present results to high-pressure H₂/air flame thermometry are also briefly described. They present an approach aiming to include the more recent basic results on coherent Raman line shape in CARS diagnostics, in order to improve the accuracy of temperature measurements.