Abstract
An air flow going through an axisymmetric cavity can interact with the acoustic modes of this cavity and produce loud self-sustained acoustic oscillations. Acoustic measurements reveal that the nature of the acoustic mode undergoes complex dynamics, alternating between phases where we observe a spinning wave with periodic inversions of its rotation direction, and phases where a high-amplitude mode is constantly spinning in the same direction. Stereoscopic particle image velocimetry gives the 3 velocity components in a 2D plane, allowing to identify the main hydrodynamic structures involved in the instability and the interactions of these structures with the mean flow and the acoustic oscillations.
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