Experimental Study of a Compliant Panel under a Mach 2 Compression Ramp Interaction

The dynamic response of a compliant panel under a shock wave/boundary layer interaction produced by a compression ramp is studied in a Mach 2 flow. The compliant panel, made of polycarbonate, is 2 mm thick and gives a fundamental-mode frequency of about 700 Hz. The compression ramp, located at the downstream end of the compliant panel, is double-sided with compression angles of 20 and 21 degrees. Side fences are used to maintain quasi-two dimensionality of the mean separated flow. The primary diagnostic techniques are high-speed stereo digital image correlation (DIC) and high-speed pressure sensitive paint (PSP). The DIC will give time resolved measurements of the displacement of the compliant panel in the vertical direction, and the PSP will give the surface pressure over the entire panel. The combination of pressure and displacement measurements will allow the characterization of the structural response of the panel due to the unsteady pressure loading caused by the shock-induced turbulent separated flow.