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Simulation numérique de jets liquides cisaillés par une phase rapide : dynamique de battement à grande échelle et intéraction avec les structures tourbillonnaires

Abstract : Fuel injection in an aircraft engine or in a rocket engine involves a liquid jet sheared by a high-velocity gas. The liquid jet can display, under some specific conditions, a flapping motion. This flapping motion, the basic mechanisms of which are still poorly understood, can significantly impact the combustion process. We perform in this work a numerical study of liquid jets interacting with a high-speed stream and focus on the interactions between the vortical structures in this high-speed stream and the liquid jet. A plane liquid jet surrounded by two high-speed streams is first analysed. The mechanisms leading to the flapping motion are studied, as well as the passive control of this instability. A liquid coaxial jet, sheared by an annular high speed stream, is next analysed. The mechanisms leading to the flapping motion are also analysed, as well as passive and active strategies for controlling this instability. Finally, we perform simulations of an experimental set-up studied at LEGI, focusing on the flow inside the nozzle.
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https://tel.archives-ouvertes.fr/tel-01147882
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  • HAL Id : tel-01147882, version 2

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STAR | CNRS | LEGI | UGA

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Nicolas Odier. Simulation numérique de jets liquides cisaillés par une phase rapide : dynamique de battement à grande échelle et intéraction avec les structures tourbillonnaires. Génie des procédés. Université de Grenoble, 2014. Français. ⟨NNT : 2014GRENI068⟩. ⟨tel-01147882v2⟩

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