Direct numerical simulations of mack-mode damping on porous coated cones

Abstract

The §ow ¦eld over a 3 degree blunt cone is investigated with respect to a hypersonic stability analysis of the boundary-layer §ow at Mach 6 with porous as well as smooth walls by comparing local direct numerical simulations (DNS) and linear stability theory (LST) data. The original boundary-layer pro¦le is generated by a ¦nite volume solver, using shock capturing techniques to generate an axisymmetric §ow ¦eld. Local boundary-layer pro¦les are extracted from this §ow ¦eld and hypersonic Mack-modes are superimposed for cone-walls with and without a porous surface used as a passive transition-reduction device. Special care is taken of curvature e¨ects of the wall on the mode development over smooth and porous walls.

The Potential of Ultrasonically Absorptive TPS Materials for Hypersonic Vehicles

“…The experiments were accompanied by numerous numerical studies on surfaces with regular microstructure. [4][5][6][7][8][9][10][11][12][13] Further experimental studies successfully used materials such as felt metal with random microstructures, Fedorov et al and Maslov et al 14,15 Based on the promising results obtained on porous surfaces and based on the fact that the majority of the TPS materials exhibit a natural porosity, Wagner et al 16,17 and Wartemann et al 18 for the first time investigated a material with practical TPS potential for passive transition control. The applied carbon fiber reinforced carbon ceramic (C/C) offers a moderate temperature stability in absence of oxygen and is an intermediate state of C/C-SiC which has been used successfully as TPS on hypersonic vehicles.…”