Étude expérimentale de l’évaporation à haute température de gouttes de combustible en régime de fortes interactions à l'aide de méthodes optiques

Abstract : The study of heat and mass transfers during the evaporation of moving and interacting droplets remain a complex field because of the various mechanisms in action. The main parameters influencing the evaporation of droplets have been studied separately thanks to non intrusive optical diagnostics that have been used on a monodisperse droplet stream. A technique based on two colors laser induced fluorescence (LIF) was developed to measure the temperature of mono and multicomponent evaporating fuel droplets. The liquid fuel is seeded by a non-fluorescent absorber to eliminate the effect of morphological dependant resonances. The size evolution was obtained thanks to shadow imaging which allowed precise measurements of evaporation rates. A hot chamber was conceived to create controlled ambient conditions around the droplets. Thereby, the Nusselt and Sherwood numbers, characterizing the heat and mass transfers, were deduced from the experimental data for various experimental conditions. The studies allowed confirming the influence of the volatility of the fuel regarding heat and mass transfers. The results also exhibit an influence of the Reynolds number. Finally, the study of multicomponent droplets had shown different heating and evaporating phases during the droplet transit time. Effects of various compositions have also been investigated
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Lionel Perrin. Étude expérimentale de l’évaporation à haute température de gouttes de combustible en régime de fortes interactions à l'aide de méthodes optiques. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0307⟩. ⟨tel-01751472⟩

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