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Cartographie d’espèces chimiques en combustion par tomographie et spectroscopie d’absorption multifaisceaux

Abstract : Chemical species densities like H₂O, CO₂, CO, K, HCl and thermodynamic data like pressure and temperature are keys parameters to understand combustion. Measurements of these parameters are great help to validate or complement numerical simulations aiming at improving engine design and efficiency. The current thesis presents the development of an optical characterization method leading to two dimensional maps of chemical densities, pressure and temperature in combustion flames. This method consists to acquire absorption spectra at different positions and angles around the reactive flow. The spectral inversion of these data can be used to recover quantitatively chemical densities, pressure and temperature. In this thesis, we have chosen to combine this spectral inversion with a tomographic algorithm in order to obtain results with improved spatial resolution. The developed method is called Tunable Diode Laser Absorption Tomography (TDLAT).Two research directions have been followed during the thesis. The first consisted to develop several absorption spectrometers associated with a mechanical scanning device of the flame. In a second time, we have searched to develop a non-linear tomographic algorithm in order to process absorption spectra series in order to obtain spatial resolution. The main results obtained in simulations have led to an optimization of the tomographic algorithm in order to adapt its functioning to measurements configurations characteristics of combustion benches. The main measurements results have been acquired in a laboratory flame and in a solid propellant combustion bench.
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Vincent Corbas. Cartographie d’espèces chimiques en combustion par tomographie et spectroscopie d’absorption multifaisceaux. Optique [physics.optics]. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLS491⟩. ⟨tel-02413238⟩

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