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Applications of FTIR spectroscopy on the combustion study and in shock tunnels

Abstract

The FTIR (Fourier Transform Infrared) techniques are appropriate for characterizing substances, like H2O, CO2 and CO, as well as for the spectroscopic determination of temperature of flames in combustion processes. This is possible because these substances, present in the exhaustion gas mixtures, absorb and emit electromagnetic radiation in the infrared region (2-5 micrometers) in the conditions of temperature and pressure of those systems. For this reason, this spectroscopic activity may be used for flame temperature measurements. Additionally, FTIR techniques have the advantage of chemical selectivity, as well as high signal-to-noise ratios. The FTIR techniques may be, therefore, employed on the studies related to sub- and supersonic combustion processes, especially shock tunnels and aeronautic turbine experiments. This project is part of a pioneer study carried out in Brazil and supported by FAPESP, which is the development of a propulsion system to be applied to satelite launching vehicles, at the Laboratório de Aerotermodinâmica e Hipersônica from the Instituto de Estudos Avançados - IEAv/CTA (project nmb. 04/00525-7), which aims to measure the spectral emission in the infrared (employing FTIR techniques) of subsonic combustion systems (reactor and turbine), as well as of the gases that flow on the surface of an aerodynamic model in a hypersonic shock tunnel. The composition as well the temperature over the test and exhaustion gases in these systems are going to be estimated. (AU)

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