Other
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.563..145o&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
This paper addresses a numerical study associated with the design of a set of inserts for in-flight measurement of the catalytic behaviour of TPS materials. To this end it is planned to use the conical leading edges of the EXPERT vehicle and to mount a series of temperature elements embedded in different materials each with different degrees of catalysis. In this paper the study focuses on the location as well as on the extend of length of the inserts. Since the location and the length of the gauges are not defined, a first assumption is made using a gauge length of 4 and 8 cm. The gauges are assumed to be fully catalytic, while the body surface non-catalytic. The impact of the full-catalytic gauges is enormous, the temperature as well as the heat flux overshoots the complete full-catalytic surface resulting in a high peak at the leading edge of the gauge. Along the insert these values relax very fast and after the trailing edge of the insert the levels decrease rapidly back towards the non-catalytic values. High heat fluxes are predicted at the edge of the inserts potentially compromising the integrity of the PM1000 depending on the trajectory flown. For the present study, the wall temperature and heat flux downstream of the inserts on the leading edges of the gauges are reduced to the non-catalytic levels. The relaxation of the species concentrations however is too slow on the non-catalytic surfaces between the inserts so that the composition of the boundary layer is different than in the case of no insert. The only way to get similar leading edge conditions is to put the gauges not serial but parallel.
Muylaert J.-M.
Ottens Harald
Walpot Louis
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