SURFACE PRESSURE MEASUREMENTS IN SHOCK-WAVE BOUNDARY-LAYER INTERACTIONS

An experimental research program establishing a database of the surfac e pressure in swept shock wave/boundary-layer interactions is describe d. An equilibrium turbulent boundary-layer on a flat plate is subjecte d to impingement by swept planar shock waves genterated by a sharp fin . Various fin angles at 4 different freestream Mach numbers produce a variety of interaction strengths from weak to very strong. For each of different interaction cases, the surface flow patterns are obtained b y a kerosene-lampblack-adhesive transparent tape technique. Surface pr essures within the interactions are also measured from several streamw ise row of taps connected to a computer-controlled Scanivalve system. An extensive error analysis is carried out for the experiments yieldin g an uncertainty of about +/- 3%. From these measurements, high spatia l resolution surface pressure distributions for different interaction cases are obtained.