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Theses

Simulation du rayonnement de l'entrée atmosphérique sur les planètes gazeuses géantes

Abstract : Exploration of the four gas giant planets, Jupiter, Saturn, Uranus, and Neptune, is important for understanding the evolution of both our solar system and the greater universe. Due to their size, flight into the gas giants involves atmospheric entry velocities between 20 and 50 km/s. This is a complex issue because the entry conditions are harsh but the related velocities are mostly beyond the capabilities of current ground testing facilities. As such, this thesis examines the possibility of experimentally simulating proposed Uranus and Saturn entries at 22.3 and 26.9 km/s in a free piston driven expansion tube, the most powerful type of impulse wind tunnel. Initially, the possibility of simulating the conditions directly by re-creating the true flight velocity was investigated. It was found to be possible to simulate the 22.3 km/s Uranus entry, but not without large uncertainties in the test condition. For this reason, it was proposed to use an established test gas substitition where the percentage of helium in the H2/He atmosphere is increased, or the helium is substituted for the heavier noble gas neon. This allows just the post-shock conditions of the entries to be simulated. Theoretically it was found that these substitutions allowed both Uranus or Saturn entry to be simulated, which was confirmed experimentally using helium. Noting the current interest in sending atmospheric entry probes to both of these planets, this study has demonstrated that the required experimental capabilities are available for performing simulated experiments using test models.
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https://tel.archives-ouvertes.fr/tel-01998442
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Submitted on : Tuesday, January 29, 2019 - 4:02:27 PM
Last modification on : Friday, July 3, 2020 - 9:28:04 AM
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  • HAL Id : tel-01998442, version 1

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Christopher James. Simulation du rayonnement de l'entrée atmosphérique sur les planètes gazeuses géantes. Autre. Université Paris-Saclay; University of Queensland, 2018. Français. ⟨NNT : 2018SACLC085⟩. ⟨tel-01998442⟩

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