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Développement de la spectroscopie DRASC femtoseconde à sonde à dérive de fréquence pour la thermométrie haute cadence dans les milieux gazeux réactifs

Abstract : The experimental study of the physico-chemical processes of combustion requires the use of non-intrusive diagnostics. This manuscript reports the development of the CARS (Coherent Anti-Stokes Raman Scattering)) laser diagnostic in the femtosecond pulse regime for which the Chirped Pulse Probe (CPP) configuration enabled instantaneous measurements of temperature at 1kHz. A theoretical, numerical and experimental study allowed highlighting the possibility to measure temperature from the data processing of instantaneous DRASC spectra acquired in air/argon mixtures (300-600K) and in premixed flame CH4/Air with an accuracy of 1% at 2100 K. Validity of these results was obtained from numerical/experimental confrontations for different scalar parameters configurations. This study would enable in the near future the application of the CPP fs CARS diagnostic in turbulent flames representative of real flows observed in aeronautical combustion.
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Frédéric Berthillier. Développement de la spectroscopie DRASC femtoseconde à sonde à dérive de fréquence pour la thermométrie haute cadence dans les milieux gazeux réactifs. Mécanique des fluides [physics.class-ph]. Normandie Université, 2017. Français. ⟨NNT : 2017NORMIR24⟩. ⟨tel-01773119⟩

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