Response of a Compliant Panel to Shock Boundary Layer Interaction at Mach 2
Akriti Tripathi, Jonas Gustavsson, Kourosh Shoele, Rajan Kumar
Abstract
View Video Presentation: https://doi.org/10.2514/6.2021-0489.vid An experimental investigation has been carried out to understand the effects of the coupling between an unsteady impinging oblique shock and a compliant panel at Mach 2 across two shock impingement locations and three cavity pressures. High-speed shadowgraph and surface oil flow visualization techniques were used to visualize the interaction region, measure the separation length on the rigid plate, and compare it with the respective interaction on the compliant panel. Single point capacitive probe measurement beneath the panel at its mid-point were carried out to measure the mean and time-resolved panel deflection. Steady PSP results provided an insight into the pressure distribution over the rigid plate and its comparison with the compliant panel. Particle Image Velocimetry was used to extract the mean velocity profile to provide a comparison between the baseline and panel interaction. Results show that the length of the separation bubble is modified in the presence of the panel. The predominantly 2D interaction over a rigid plate was modified to a three-dimensional interaction in the presence of the panel. A reduction in the cavity pressure from ambient resulted in a reduction of the separation bubble length for central shock impingement location, while increasing the interaction length at the 3/4th impingement location. Thus, the static deflection shape resulting from the combined effects of the impingement location and the cavity pressure governs the characteristics of the interaction.