Experimental characterisation of the internal flow field of a fluidic oscillator*

We report on the characterization of a fluidic jet oscillator using PIV, PTV, and pressure measurements. The fluidic actuator has a single feedback channel configuration originally studied by Spyropoulos (1964) that incorporates acoustic excitation for phase synchronization. The device contains a splitter to produce a pulsed jet with potential applications in flow control problems. The synchronization of an array of such devices is of particular interest in many applications. Recent work has demonstrated that acoustic excitation can change the oscillation frequency in a fluidic oscillator and control the oscillation phase (Nicholls & Bacic, 2023). The goal is to understand the physical mechanism associated with synchronous vs. asynchronous mode of operation.