Other
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.563..139w&link_type=abstract
Proceedings of the Fifth European Symposium on Aerothermodynamics for Space Vehicles (ESA SP-563). 8-11 November 2004, Cologne,
Other
Scientific paper
The EXPERT vehicle is currently being designed to flight-test state-of-the-art instrumentation to measure transition, catalysis and real gas effects during hypersonic reentry. This paper focuses on two design issues of the EXPERT vehicle: the TPS heat flux predictions and the stability of the configuration in the transonic regime. For accuracy, the in-flight measurements require a clean, non-polluted flow field around the vehicle which motivates the use of nonablative high temperature TPS. Currently, the nose and flaps are covered with C-SiC materials, previously developed to fly on the X38 demonstrator. The rest of the vehicle is to be covered with a nickel-chromium alloy (dubbed PM1000), representative of state-of-the-art hot structure materials. The occurrence of different catalytic properties of both materials results in a significant heat flux overshoot at the C-SiC nose and PM1000 aft body junction. The magnitude of the computed overshoot justifies a thorough analysis of its implications for the design even at the current early stage of the study. Indeed, heat fluxes exceeding those computed by assuming a fully catalytic vehicle have been evidenced and are reported in this article. Aerothermal environment predictions for the EXPERT vehicle for the nominal 5 and 6 km/s re-entry trajectories, assuming radiative equilibrium, and the associated catalysis effects are presented. Finally, the static stability of the vehicle is addressed in the supersonic and transonic regime in order to assess the suitability of a transonic or supersonic descent system activation. Key words: transonic; catalysis; hypersonic.
Bayle O.
Caporicci Marco
Muylaert J.-M.
Ottens Harald
Saccoccia Giorgio
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