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Etude de la propagation d’une onde de souffle en milieu non-homogène – étude expérimentale

Abstract : The study presented in this thesis concerns the evolution of a shock wave in a non-idealized environnment. The evolution of a free-field shock wave can be described by various empirical results found in the literature or by theoretical formulations. However, as soon as it is a question of approving the results of a simulation code describing the evolution of a shock wave in a complex environnment, knowledge about the development of waves in a free-field is no longer sufficient. Therefore, new experimental data must be acquired to validate the different simulation tools in-house. The results of this thesis are part of this project. Small-scale tests have been sized to fit a scenario with an explosive nature different from that used in the laboratory. The source used is gaseous and made of propane oxygen at a stoichiometric proportion. To measure the different characteristics of a shock wave and to acquire new results, two measurement systems were used. Pressure sensors have been installed on the ground, coupled with a visualization system with a high speed camera whose is close to shadowscopy. Several configurations allowed to have solid basis on the characteristics defining the incident and reflected shock waves in free field. The study focuses on Mach's reflection moreover on Mach stem. Subsequently isolated obstacles were installed on the path of an incident wave or Mach’s reflection to represent surface effects. The results showed a change in the characteristics and morphology of the waves downstream of the obstacles.
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Yohann Maillot. Etude de la propagation d’une onde de souffle en milieu non-homogène – étude expérimentale. Autre. Institut National des Sciences Appliquées - Centre Val de Loire, 2018. Français. ⟨NNT : 2018ISAB0010⟩. ⟨tel-02414248⟩

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