Exploration of Upstream Influence and the Role of Shock Generator Geometry in Shock Wave/Transitional Boundary Layer Interactions at Mach 1.8 Edge Conditions

摘要

This work expands on previous efforts that have observed spectral peaks in the dynamic shock motion generated by shock wave/boundary layer interactions with Mach 1.8 edge conditions when the inflow boundary layer is in transition. Specifically, this effort seeks to characterize the behavior of a thickening of the boundary layer upstream of the separation shock location that appears to strongly correlate with the motion of the upstream influence shock, and verify that the focused spectra observed in measurements with a cylinder on a flat plate are also observed in interactions generated by a blunt fin or on a cone with similar boundary layer edge conditions. The dynamic motion of the shock waves in the transitional interactions are characterized using high-speed schlierenand statistical information derived by tracking the location of various features of the interaction within the frame sequence.