European Experimental Reentry Testbed Winglet: From In-Flight Characterization to SCIROCCO Test

This work is dedicated to the aerothermodynamic characterization, both in flight and at wind-tunnel conditions, of the ultrahigh temperature ceramic winglet that will embark on the European Experimental Reentry Testbed of the European Space Agency. The experimental test has been executed in the Centro Italiano Ricerche Aerospaziali SCIROCCO plasma wind tunnel conditions on a winglet qualification model. The aim of the test was to reproduce the total thermal load, which the winglet will be subjected to during the reentry trajectory, allowing preflight qualification and verification of materials and sensing equipment. Detailed-three dimensional computations in plasma-wind-tunnel conditions have allowed the verification of the test requirement and provided information about the physical phenomena that can cause dangerous local overpressures and overheatings on the capsule thermal protection system. The actual test condition has been rebuilt after the test by means of three-dimensional simulations; particular attention has been paid in modeling surface catalysis and emissivity. Finally the aerothermodynamic code has been coupled with a thermal code to account for material thermal conduction. Numerical results have been compared in terms of pressure and temperature with experimental measurements showing good agreement. [PUBLICATION ABSTRACT]