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Stockage d'ergol cryogénique pour l'exploration spatiale : étude expérimentale, modélisation et optimisation d'un système de contrôle thermodynamique à échappement

Abstract : Future operations in space exploration require the ability to store cryogens for long duration. Residual heat loads induce cryogenic propellant vaporization andtank self-pressurization (SP), eventually leading to storage failure for long enough mission duration.This thesis focuses on a control strategy, called Thermodynamic Venting System (TVS), based on a recirculating liquid subcooled injection. The injection results inan ullage condensation, a liquid bath destratification and thus a tank pressure reduction.Experimentally, an original active insulation technique has been set up, yielding a net zero heat flux wall boundary condition. A data base ofself-pressurisation and TVS control experiments has been gathered with this new aparatus.It was used to validate an homogeneous thermodynamic model providing a fast prediction of tank temperature and pressure during control.This model has been extended to discribe the TVS system behaviour including all its components. This full system design tool has been coupled with an optimisationplatform and an optimal TVS design has been established for a demonstration mission.Furthermore, a numerical study has evidenced the weakness of commercial CFD software to simulate phase change, for TVS configuration.A predictive phase change formulation has been set up in a home-made software and validated on a 1D academic case.
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Samuel Mer. Stockage d'ergol cryogénique pour l'exploration spatiale : étude expérimentale, modélisation et optimisation d'un système de contrôle thermodynamique à échappement. Thermique [physics.class-ph]. Université Grenoble Alpes, 2016. Français. ⟨NNT : 2016GREAI059⟩. ⟨tel-01591889⟩

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