Passive air-jet blowing is an effective yet simple technique to control flow-induced noise due to vortex shedding of bluff bodies. The current study investigates the effect of the specific slot angles of passive jets in connection with the suppression capabilities of vortex shedding and the byproduct of vortex-induced noise in the wake region of a circular cylinder. Aeroacoustic tests for a baseline case and 10 different slotted cases with slot angles of 80 ° θ 125 ° are performed for Reynolds numbers 6.6 × 10 3 R 3.3 × 10 4 . This is supplemented by numerical computational fluid dynamics (CFD) analyses to identify the underlying aerodynamic mechanisms. The results obtained reveal that using the current passive control method results in a significant reduction of the vortex shedding tonal noise for slot angles of 90 ° θ 125 ° and high Reynolds numbers. The numerical results showed good agreement with a remarkably reduced kinetic energy for slot-end angles of 115 ° θ 125 ° . At low Reynolds numbers, however, the identified aeroacoustic benefits tend to cease.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Passive Control of Vortex Shedding Noise of Circular Cylinders by Passive Air-Jet Blowing


    Contributors:

    Published in:

    Publication date :

    2021-06-11




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown