NORTH CAROLINA STATE UNIVERSITY Raleigh United States
Inlet unstart is initiated and sustained by avalanche growth of separated flows resulting from the interaction between different shock boundary layer interaction SBLI units within rectangular isolators. In this study, an experimental campaign is undertaken to investigate the primary and corner SBLI dynamics to provide unprecedented insights into the flow interactions that precede and propagate rectangular inletisolator unstart. Surface streakline visualization, high-frequency wall pressure measurements, and dynamic streakline visualization were performed to delineate how corner and primary separated flow units mutually interact with one another with an increasing imposed steady back pressure, and how this interaction results in the avalanche growth of separated flows. Our results provided unique insights into the dynamics of the primary and corner separated flows and the sources that drive these separation units. Further our results suggest that the corner separation is indeed an integral driving component of the separated flow dynamics of the entire isolator flow.