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 L / D = 5.43 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.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Using High-Frequency Pulsed Supersonic Microjets to Control Resonant High-Speed Cavity Flows


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 58 , 8 ; 3378-3392


    Erscheinungsdatum :

    2020-06-11


    Format / Umfang :

    15 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Control of Supersonic Impinging Jet Flows Using Supersonic Microjets

    F. S. Alvi / C. Shih / R. Elavarasan et al. | AIAA | 2003


    Control of supersonic impinging jet flows using supersonic microjets

    Alvi, F.S. / Shih, C. / Elavarasan, R. et al. | Tema Archiv | 2003


    Control of supersonic impinging jet flows using microjets

    Alvi, F. / Elavarasan, R. / Shih, C. et al. | AIAA | 2000



    Principles of a High-Bandwidth Microacutator Producing Supersonic Pulsed Microjets

    T Solomon, John / Kumar, Rajan / S Alvi, Farrukh et al. | AIAA | 2010