Simultaneous high-speed displacement and surface pressure measurements of a compliant panel under a Mach 2 compression ramp interaction

In this presentation we will discuss a new study of the dynamic response of a compliant panel under a shock wave/boundary layer interaction produced by a compression ramp in a Mach 2 flow. The experiments were conducted in the High-Speed Wind Tunnel at the J.J. Pickle Research Campus at The University of Texas at Austin. The tunnel has a cross-sectional area of 150 mm by 150 mm, and the compliant panel is 127 mm by 68 mm and located at the spanwise centerline of the floor of the test section. The compliant panels are made of polycarbonate and have thicknesses of 2 mm, 1.5 mm and 1 mm. The compression ramp, which was located at the downstream end of the compliant panel, has a 20 degree compression angle and is 102 mm wide and 28 mm high. Side fences were used to maintain quasi-two dimensionality of the mean separated flow. Fast-response (Kulite) pressure transducers were located immediately upstream of the compliant panel. The primary measurements that will be reported are simultaneous surface displacements by using the stereo digital image correlation (DIC) technique, and fast pressure sensitive paint (PSP). Both techniques were performed at 6.4 kilohertz acquisition rates. The DIC gives the displacement of the compliant panel in the vertical direction, and the PSP gives the surface pressure over the entire panel. The combination of pressure and displacement measurements allows the characterization of the structural response of the panel due to the unsteady pressure loading caused by the shock-induced turbulent separated flow