Coupling of vortex shedding with a cavity

A pulsating flow within a tube with one end sealed and the other end open, facing a low-velocity wind tunnel flow, may be generated by using a wedge trip placed upstream of the open end of the tube. However, a reasonable explanation about the generating mechanism of the pulsating flow within the resonator coupled with a tripping device has not been given yet.

In order to get a better understanding of the coupling of the flow around the wedge trip and the flow oscillation within the resonator, the interaction between the wedge wake and the pulsating flow has been experimentally investigated by means of the hydraulic analogy. The results of flow visualization with shadow-graph technique have provided a good understanding of the coupling phenomena of vortex shedding on the wedge with the flow at the resonator mouth.