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Contribution à l'étude numérique des jets supersoniques sous-détendus

Abstract : This study stems in particular from the need to control, during the integration stage of an aeronautical engine, the hazards related to the possible discharge of hot and highly pressurized gases issued from an orifice accidentally created at the combustion chamber wall. After a review of the phenomenology of such a flow, a strategy is proposed to overcome the difficulties encountered when such jets are to be dealt with numerically in order to obtain converged solutions at a moderate computing cost / accuracy ratio. The chosen method relies on i) a mixed finite volume / finite element approach to integrate the axisymmetrical formulation of the compressible Navier-Stokes equations, ii) upwind schemes (TVD) to evaluate the convective fluxes, iii) an anisotropic readaptation algorithm for unstructured meshes and iv) a modified k-ε turbulence model including compressibility effects. The analysis of the results demonstrate the efficiency of the proposed strategy which leads us to correctly forecast the overall jet structure which proved to be very sensitive to the inlet conditions prescription. Such a feature strongly suggests that the corresponding certification tests definition should be updated accordingly.
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https://tel.archives-ouvertes.fr/tel-00010669
Contributor : Guillaume Lehnasch <>
Submitted on : Monday, October 17, 2005 - 7:16:40 PM
Last modification on : Wednesday, November 4, 2020 - 10:44:06 AM
Long-term archiving on: : Friday, November 25, 2016 - 9:42:20 AM

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  • HAL Id : tel-00010669, version 1

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Guillaume Lehnasch. Contribution à l'étude numérique des jets supersoniques sous-détendus. Modélisation et simulation. Université de Poitiers, 2005. Français. ⟨tel-00010669⟩

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