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Elaboration d'un modèle détaillé d'une boucle diphasique gravitaire et développement d'un modèle réduit associé

Abstract : Today, electrical systems are becoming increasingly important in the air, rail and automotive sectors.The immediate consequence of this progress is the miniaturization of systems (converters) requiring very important cooling means. Whereas conventional cooling solutions are reaching their limit, an alternative one can be sought in two-phase loops based on the liquid-vapor phase change of a working fluid, in particular two-phase loop thermosyphon. The objective of this thesis is twofold : to propose a detailed model of a two phase loop thermosyphon as well as a reduced model able to calculate the variables at any location of the loop at any time with a much smaller computing time. First, the equation of the transient one-dimensional compressible one-phase and two-phase fluid flow is solved using the explicit Euler method of order 1 and the finite volume method. The liquid-vapor mixture is modeled as a homogeneous mixture at mechanical and thermal equilibrium. The closure laws of the model are deduced from the "Stiffened Gas" state laws. For the reduced model, an extension of the modal identification method is proposed. The structure of the reduced model is first determined carrying out the Galerkin projection of the continuous conservation equations.Then the parameters of the model are identified by the resolution of an optimization problem. The reduced model thus constructed is then validated on several cases with different dynamics
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Submitted on : Wednesday, August 2, 2017 - 1:01:58 AM
Last modification on : Wednesday, November 3, 2021 - 5:58:20 AM


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  • HAL Id : tel-01571268, version 1



Hèzièwè Serge Bodjona. Elaboration d'un modèle détaillé d'une boucle diphasique gravitaire et développement d'un modèle réduit associé. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2017. Français. ⟨NNT : 2017ESMA0005⟩. ⟨tel-01571268⟩



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