Computational Analysis on Generic Forms in European Hypersonic Facilities: Standard Model Electre and Hyperboloid-Flare
Extensive experiments and associated numerical computations have been carried out on two generic forms. The first generic form is a blunt cone called Electre whose purpose is to serve as a standard model in hypersonic wind tunnel testing. The second form is a hyperboloid flare for the study of the separation and reattachment of the boundary layer in front of a deflected control flap. The Electre standard model does not only serve to improve the flow quality of hypersonic tunnels but also to improve the measurement techniques and data reduction procedures. Sensitivity computations with a finite rate catalytic model were performed in high-enthalpy wind tunnel conditions, in particular the influence of the wall temperature has been addressed. The hyperboloid flare turned out to be an excellent test case for CFD validation especially for the high Reynolds laminar perfect gas regime. This axisymmetric generic form provided also the possibility to study the influence of real gas effects on flap efficiency and heating. An increase in flap efficiency resulting from the shrinking of the separated boundary layer region in front of the flap combined with an increase of the pressure recovery on the flap has been computed when extrapolating from high-enthalpy wind tunnel to flight conditions according to the binary scaling law. In order to separate dissociation effects from Mach and Re effects perfect gas computations with variable γ were performed.
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