Fluidic oscillator with active phase control
This paper demonstrates the closed-loop control of the frequency and phase of a fluidic oscillator using acoustic excitation. It is shown experimentally that the use of acoustic excitation modifies the passive feedback mechanism and slows down the jet switching process. Closed-loop control is employ...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Institute of Aeronautics and Astronautics
2023
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| Summary: | This paper demonstrates the closed-loop control of the frequency and phase of a fluidic
oscillator using acoustic excitation. It is shown experimentally that the use of acoustic excitation
modifies the passive feedback mechanism and slows down the jet switching process. Closed-loop
control is employed to vary the oscillation frequency at a fixed flow rate and track a sinusoidal
reference target without phase error, using measurements from a pitot probe in the device.
The controller is demonstrated to be effective at rejecting disturbances, which is illustrated
with both time and frequency domain data. The controller’s ability to track step changes to
the reference signal phase is tested and the closed-loop bandwidth is shown to be around 20%
of the oscillation frequency, in close agreement with the theoretical prediction. |
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