Transonic dip mechanism of flutter of a sweptback wing. II

Conclusions An experimental investigation of the RR—-MR and MR-*RR transitions over concave and convex, smooth and rough wedges revealed that 1) as the surface roughness increases, the wedge angle at which transition takes place (for a given Mach number) decreases and 2) for a mesh 40 sand paper type surface roughness, it seems that the transition angle becomes independent of the incident shock wave Mach number, i.e., a) MR—>RR transition occurs at 6W =^54 deg and b) RR-MR transition takes place at Ow-21 deg. These results should be of great importance to those dealing with reflections of blast waves, since this type of problem involves nonstationary flows and high degrees of surface (ground) roughness.