Jet noise is amplified at low frequencies when the jet is installed under a wing. Serrations are designed at the nozzle exit to mitigate installation noise generation. In this paper, hybrid large-eddy simulation (LES) and Reynolds-averaged Navier–Stokes (RANS) is performed to investigate the serration effects on installed jet flows and acoustics in an industrially relevant configuration: an ultra-high-bypass-ratio aeroengine mounted under a three-dimensional wing. The results show that the serrations are able to weaken jet and wing interactions, and consequently reduce far-field installation noise. The noise reduction mechanisms have been sought through the quadrupole sources in the jet plume and evanescent pressure wave scattering at the wing trailing edge.


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    Title :

    LES–RANS Study of Serrated Nozzle Jet Aeroacoustics for an Installed Ultra-High-Bypass-Ratio Aeroengine


    Contributors:

    Published in:

    AIAA Journal ; 59 , 10 ; 4155-4165


    Publication date :

    2021-10-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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