Aerothermodynamics in the Heart of the Reentry Vehicles Shape Design and Mission Analysis Matters

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/RESUME On the path to a Reusable Space Transportation System, Europe first reviewed the gaps to fulfil. Then, a step-by-step master plan with both on-ground and in-flight tests was drawn up with the uppermost goal to secure the development of the future Reusable Launch Vehicle (RLV) and get proof of its economic efficiency. With the potential budgets and programmatics foreseeable milestones throughout Europe, CNES, the French Space Agency, has engaged since late 2000 a feasibility study of a low-cost experimental vehicle, dubbed Pre-X, with EADS SPACE Transportation as leading contractor. A System Concept Review was held in June 2002. Then, prior to a full-scale development and its integration within a European Programme, studies have been pursued in the way to deepen the feasibility level of the Pre-X vehicle and in order to enforce both the project objectives and the technical definition. During the so-called Phase A1 of the Pre-X project, from October 2003 to October 2004, the emphasis is notably put on the aeroshape consolidation and the mission analysis, whose goal is to decrease the heat fluxes. This paper aims at showing how aerothermodynamics studies can support and direct those two activities. As far as the shape design is concerned, aerothermodynamics (ATD) analyses have permitted for instance to bring out a critical issue related to the occurrence of a shock wave/shock wave interaction on the flaps, resulting in an unacceptable heating. ATD studies have moreover provided input data for the mission analysis by determining the re-entry corridor with the related thermal limits: oxidation process on the nosecap, as well as limit temperatures on the nosecap, the windward side and the flaps. For that purpose, both Euler + Boundary Layer computations and Navier-Stokes computations have been performed.

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