The effect of three different modes of acoustic excitation on an unsteady separating flow over a circular cylinder at a Reynolds number (Red) of about 1.5×105 has been investigated. The acoustic exciters included (I) a speaker mounted inside the cylinder and blowing through a narrow spanwise slot; (II) a circular piezo-electric acoustic transducer mounted flush with the surface; and (III) strip shaped flush mounted acoustic transducers. The first mode of excitation was judged most effective at about 1.3 kHz, based on changes in the time-averaged surface pressure distribution on the cylinder. The corresponding frequencies for (II) and (III) were 7 kHz and 2.25 kHz respectively. The transducers (II) and (III) did not introduce the blowing and suction effects of transducer (I). Transducer (II) increased the mean surface pressure slightly, while (I) and (III) reduced it.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    On the Differences Between the Effect of Acoustic Perturbation and Unsteady Bleed in Controlling Flow Separation Over a Cylinder


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Aerospace Technology Conference and Exposition ; 1993



    Publication date :

    1993-09-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    The mechanism of flow control on a cylinder with the unsteady bleed technique

    WILLIAMS, DAVID / ACHARYA, MUKUND / BERNHARDT, JOHN et al. | AIAA | 1991


    Controlling unsteady separation with acoustic active surfaces

    Sinha, Sumon / Pal, Dipankar | AIAA | 1994



    BLEED PERTURBATION TO FORE-BODY ASYMMETRIC VORTICES

    Deng, X. / Chen, X. / Wang, Y. et al. | British Library Conference Proceedings | 2004