A novel actuator concept is evaluated in a series of active flow control experiments on a resonant high-speed cavity flow. The actuator generates pulsed supersonic microjets by using the resonance of an impinging microjet source, and with smart materials incorporated into its design, the actuator’s resonant frequency can be actively controlled. The actuator was designed such that its resonant frequency would lie within the range of predicted cavity resonance. Results from Mach 1.5 flow over a cavity of length are presented, and the actuator’s performance is evaluated across three modes of operation: pulsed, active pulsed, and steady. In the active pulsed mode, the smart materials are used to actively vary the actuator’s resonant frequency, enabling frequency modulation of the actuator’s output. When the actuator operates in both pulsed modes, the amplitude of the dominant peak in the cavity’s unsteady pressure spectra is reduced by as much as 7 dB. However, steady microjet injection yields more effective control. The dominant peak is substantially attenuated (by 25 dB) in this mode of operation. The effectiveness of the steady mode is attributed to higher momentum flux that can be attained in contrast to the pulsed modes of operation.
Using High-Frequency Pulsed Supersonic Microjets to Control Resonant High-Speed Cavity Flows
AIAA Journal ; 58 , 8 ; 3378-3392
2020-06-11
15 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Control of supersonic impinging jet flows using supersonic microjets
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