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.
LES–RANS Study of Serrated Nozzle Jet Aeroacoustics for an Installed Ultra-High-Bypass-Ratio Aeroengine
AIAA Journal ; 59 , 10 ; 4155-4165
2021-10-01
Conference paper , Article (Journal)
Electronic Resource
English
Advanced RANS/LES methods for aeroacoustics
British Library Conference Proceedings | 2013
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