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Fluidic Actuators Non-linear Acoustic Waves in Resonators
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Fluidic Actuators
Diagram showing experiments done with fluidics devices in a cavity and a rectangular jet (click for larger version).
Graph showing the suppression effects of a fluidic device on cavity tones (click for larger version).
Fluidics is the technology of using fluid phenomena such as wall-attachment and stream interaction to perform the functions of sensing, logic, and control. The research in fluidics is for innovative technology development involving the uses of fluidic devices for flow and noise control. There are three different concepts of fluidic devices that are studied. The first, with dimensions on the order of 10cm, are useful for illustrating the principles, but are bulky, produce only low frequency oscillations (< 500 Hz), and are not easily integrated into applications. The second concept uses two fluidic nozzles, with dimensions on the scale of 1cm, on either side of a larger scale primary flow. This technique produces a large increase in primary jet mixing, however, the mass injection rates are too high for it to be practical. The third concept uses very small fluidic nozzles, with dimensions on the order of 1mm, to suppress jet-cavity interaction tones. The miniature scale nozzles are effective in suppression with very low injection requirements. Further work is being done to develop fluidic nozzles with dimensions on the order of 100 microns to produce signals at frequencies as high as 10kHz for use as devices for active noise and flow control.
Examples (movies): 1. Jet without any fluidic actuator. 2. Jet thrust vectoring (1 fluidic actuator at the bottom). 3. Jet mixing with 2 opposite fluidic actuators (screen plane) 4. Jet mixing with 2 opposite fluidic actuators (perpendicular to the screen). |
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