An unswept fin is placed in Mach 2 flow at an angle () of 15 deg, creating a fully separated interaction of strength, . The time-averaged behavior of the interaction is characterized by mean surface pressure measurements inside the inception zone and in the quasi-conical region. The interaction dynamics are explored through unsteady surface pressure measurements, where the highest unsteadiness is observed near the intermittent separation and underneath the open separation bubble. Further insights into the unsteadiness are sought by examining the contributions to the total pressure fluctuations in three spectral regimes: low-frequency (), mid-frequency (), and high-frequency (). Mid-frequency fluctuations dominate the current 3-D SBLI, in contrast to 2-D interactions where low-frequency disturbances are shown to be prominent. Finally, the interaction is visualized using high-frame-rate conical shadowgraphy (24,000 fps), where a shock identification scheme is used. The PDF of the separation shock locations revealed that it travels the farthest compared with the other two shock features. It is inferred that the smaller extent of the -shock is more probable, which is further confirmed by conditionally sampling the shock slope based on the movement of the separation shock.
Unsteady Characteristics of a Swept-Shock/Boundary-Layer Interaction at Mach 2
AIAA Journal ; 57 , 10 ; 4548-4559
01.10.2019
Aufsatz (Konferenz) , Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch