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Simulation numérique des écoulements turbulents dans les canaux de refroidissements : application aux moteurs-fusées

Abstract : This research deals with the numerical simulation of compressible turbulent flows with heat transfers, applied to rocket engines. It relates more particularly the cooling of combustion chambers, in which a fluid flows in a supercritical state (high pressure and low temperature) inside millimeter channels. These problems involve complex physical phenomena and coupling between compressible aspects and heat transfer phenomena as well as supercritical thermodynamics. From a numerical point of view, two specific solvers have been used in the context of this thesis. The first code (CHOC-WAVES) has been developed in the CORIA lab for compressible flows and shock waves. The second one (PPMBFS) has been developed at the Pennsylvania University for applications with supercritical thermodynamics variables. In terms of physical modeling, the LES approach has been widely used in support of DNS. In this context, a thermal subgrid model using a variable turbulent Prandtl number has been integrated and validated. A supersonic cooled channel has been simulate dusing both LES and DNS techniques and its results have been carefully analysed through the aerothermics correlations and coherent structures. In particular, it has been shown that the Strong Reynolds Analogy hypothesis (SRA), in the case of a strongly anisothermal flow is not valid anymore. The wall heat flux had an impact on the coherent structures. The issue of real gases was then examined through the industrial channel flow simulation (EH3C). This study has high lighted the difficulties (both numerical and physical) associated with this type of flow. The various investigations have provided useful information, especially regarding the phenomenology of coherent structures and various aerothermodynamics correlations.
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David Taieb. Simulation numérique des écoulements turbulents dans les canaux de refroidissements : application aux moteurs-fusées. Autre. INSA de Rouen, 2010. Français. ⟨NNT : 2010ISAM0033⟩. ⟨tel-00925522⟩

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