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Analyse expérimentale et modélisation de caloducs oscillants en contexte aéronautique

Abstract : The continuous increase of heat flux densities involved in aeronautic context, and their evacuation, represent a major issue nowadays. The solutions used until now are no longer sufficient to ensure the thermal maintenance of these systems, requiring new technologies. Among them, the pulsating heat pipe induces a growing interest. Thus, the French FUI project Optimal suggests employing this technology in order to optimize the cooling of new electric turbomachines. The work led in this PhD aims to evaluate the performances of such a system in this context, by experimental and numerical means.The experimental study which has been conducted consisted in the development of a prototype, starting from which experiments have been led. These tests allowed characterizing the thermal performances of the system through parametric investigations. Thereby, it has been observed an obvious improvement of these performances under some operating conditions, but also several particular behaviors. In addition to that approach, one adds a theoretical study based on the development of a numerical model. Given the complexity of the mechanisms governing the pulsating heat pipe’s operation, this model focuses on a simplified system, characterized by the motion of vapor bubble-liquid slug structure, in which a liquid film, deposited downstream, is subjected to evaporation. This model has conducted to highlight the physical phenomena associated to the thin film evaporation in a capillary tube, and to establish a cartography of its applicability fields, according to the considered assumptions.
Keywords : Liquid film
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Jean-François Bonnenfant. Analyse expérimentale et modélisation de caloducs oscillants en contexte aéronautique. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2013. Français. ⟨NNT : 2013ESMA0013⟩. ⟨tel-02402062⟩

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