Large-Scale, Low-Frequency Phenomena Ahead of a Supersonic Wing-Body Junction

Wing-body junctions are a geometric feature commonly observed in aircraft. At supersonic speeds, they exhibit shock-induced flow separation (SIFS) which are associated with detrimental phenomena including separating shocks and the subsequent flow separation. SIFS is also characterized by low-frequency phenomena. In the current study, a supersonic wing-body junction flow is investigated using time-resolved Schlieren. Experiments are conducted in a Mach 1.4 blowdown wind tunnel. The large-scale events in the flow are studied using Proper Orthogonal Decomposition (POD) and these events are expected to exhibit low-frequency phenomena.