Hydrodynamic Stability of a Supersonic Laminar Boundary Layer over a Rough Wall.

摘要

The purpose of this research is to see how surface roughness affects the hydrodynamic stability of a supersonic laminar boundary layer. The outcome of the first year of the program had been: (1) to demonstrate the great resistance of the supersonic flow to destabilization and tripping by roughness; (2) to choose a final roughness capable of such destabilization and tripping; and (3) to complete boundary layer surveys on an axisymmetric body so roughened as a prerequisite to the stability measurements. In the present report period the geometry was changed to a planar (flat plate) one to correct deficiencies found in the axisymmetric flow which, however, uses the same roughness geometry as before. The flow field measurements on this model have been completed, as have about 30% of the final stability measurements.