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Analyse expérimentale et contrôle actif de l'écoulement dans un compresseur axial mono-étagée durant la transition vers le décrochage tournant

Abstract : Over the past decades, the aviation sector has continuously grown, and the number of passengers carried has increased considerably. At the same time, increasingly restrictive policies have been put in place to reduce our environmental impact, especially by reducing CO2 emissions. In this context, engine manufacturers try to design more efficient engines, leading to the use of operating points closer to the stability limits and to higher loading of the compressor stages. However, these regions are more sensitive to the onset of rotating stall, and manufacturers seek to avoid them by using large security margins. Two major problems must therefore be addressed, extending the operating range of the compressor by moving its stability limit and being able to know precisely the position of its operating point to reduce the security margin.Moreover, even if the phenomenon of rotating stall is now globally well understood, recent studies have highlighted new onset mechanisms. Thus, in order to correctly handle the two main challenges cited before, it is necessary to improve our knowledge of the underlying mechanisms of the phenomenon inception. This PhD thesis follows this approach by proposing a study of the rotating stall onset, and then the development and analysis of a surveillance and active flow control system, using continuous or pulsed jets, which aims at warning of the approach of sensitive areas and expanding the operating range of the compressor by preventing the onset of stall.
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Gabriel Margalida. Analyse expérimentale et contrôle actif de l'écoulement dans un compresseur axial mono-étagée durant la transition vers le décrochage tournant. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2019. Français. ⟨NNT : 2019ENAM0039⟩. ⟨tel-02481474⟩

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