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Étude numérique et expérimentale des jets d’ergols cryogéniques autour d’un avion spatial et leurs conséquences sur le risque d’explosion

Abstract : ArianeGroup is developing new vehicles using innovative propulsion systems. One of them is a Spaceplane equipped with a rocket engine running with cryogenic methane and oxygen. During the atmospheric flight, rocket propellants can be dumped whereas turbojets are functioning. The gaseous cloud and the resulting explosion risk must be assessed. The draining leads to the formation of a cryogenic liquid jet in an air crossflow. The modeling of these jets is complex and requires consequently heavy computing resources. This aspect and the lack of representative experimental data guided us toward an approach without multiphasic flows. A densified gas law has thus been implemented. A wind tunnel experimental bench was developed and tested to validate the numerical model. For security reasons, liquid nitrogen was preferred over liquid methane. The experimental results were compared to the numerical ones with reasonable agreement which confirms hypothesis of our model. The ignition of the gaseous mixtures produced by the in-flight draining was then studied. The LIQUIM (Laser Ignition of QUIescent Mixtures) test bench was used for two different studies. Both were done with initial pressures representative of the flight conditions but the first one used air mixtures with 20 % of dioxygen and the second one with 30 % of dioxygen. The flammability limits and the minimal ignition energies were calculated in both cases. Explosion pressure and high-speed camera measurements were added for oxygen enriched mixtures. Experimental results were compared to simulations from GASEQ and CHEMKIN-PRO software.
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https://tel.archives-ouvertes.fr/tel-03128879
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Jérémy Dougal. Étude numérique et expérimentale des jets d’ergols cryogéniques autour d’un avion spatial et leurs conséquences sur le risque d’explosion. Autre. Université d'Orléans, 2019. Français. ⟨NNT : 2019ORLE3035⟩. ⟨tel-03128879⟩

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