Fluidic Oscillator with Active Phase Control

This paper demonstrates the closed-loop control of frequency and phase a fluidic oscillator using acoustic excitation. It is shown experimentally that use excitation modifies passive feedback mechanism slows down jet switching process. Closed-loop employed to vary oscillation at fixed flow rate track sinusoidal reference target without error, measurements from pitot probe in device. The controller demonstrated be effective rejecting disturbances, which illustrated with both time domain data. controller’s ability step changes signal tested, bandwidth around 20% frequency, close agreement theoretical prediction.