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Theses

Analyse et modélisation de la dynamique de jets décollés en tuyère supersonique

Abstract : This thesis, conducted in collaboration with CNES and Pprime Institut, has the objective of enhancing the dynamic phenomena understanding present in supersonic rocket nozzle. These phenomena may cause lateral loads that can damage the nozzle.The study focused on an ideal nozzle geometry and 3 operating points. The work is based on the exploitation and analysis of experimental and numerical data. The experimental data come from a campaign carried out within the Pprime Institute involving measurements of wall pressure synchronized with measurements of velocity fields by PIV. In addition, a numerical part reproducing the experimental tests using high-performance numerical simulations based on hybrid RANS/LES approaches is carried out.The experimental and numerical data show a particular organization of the wall pressure fluctuations observed in some work whose origin remains unknown. The study shows that this organisation is also present in the velocity field of the jet where links with wall pressure have been established by correlation calculations. Numerical simulations show that such a coordination of the pressure field drives the lateral force dynamics. Some scenarios on the origin of this organised fluctuation are discarded by the use of reduced flow models.
Keywords : Side loads
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Florian Bakulu Natungadio. Analyse et modélisation de la dynamique de jets décollés en tuyère supersonique. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2019. Français. ⟨NNT : 2019ESMA0020⟩. ⟨tel-02860044⟩

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