Effects of Passive Porous Walls on Hypersonic Boundary Layers

A theoretical linear stability analysis is used to consider the effect of a porous wall on the first mode of a hypersonic boundary layer on a sharp slender cone The effect of curvature and of the attached shock are included. The flow in the hypersonic boundary layer is coupled to the flow in the porous layer. The theoretical model of a porous wall developed by Fedorov and his co-workers is used for regular microstructures. The resulting transcendental equations are solved numerically Neutral solutions ale presented, indicating a destabilizing effect of the porous wall The spatial growth rates determined demonstrate that the porous wall leads to a significant increase in growth mates