Industrial Prediction of Jet-Flap Interaction Noise with Advanced Hybrid RANS-LES Methods

Mockett, Charles; Fuchs, Marian; Knacke, Thilo; Krämer, Felix; Michel, U.; Steger, Mathias; Thiele, Frank

doi:10.1007/978-3-030-27607-2_24

Cited by 1 publication

(1 citation statement)

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“…14 Hybrid LES-RANS has been successfully developed to simulate installed jets from canonical 15 to industrial levels. 16,17 In the above, turbulence statistics and dynamics are captured in the jet plume by LES from first principles. The far-field sound was accurately predicted by performing Ffowcs William-Hawkings (FW-H) integration using near-field LES flow data.…”

Section: Introductionmentioning

confidence: 99%

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

2021

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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, LES-RANS is performed to investigate the serration effects on installed jet flows and acoustics in an industrially relevant configuration, an Ultra-High-Bypass Ratio (UHBR) 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. Nomenclature c Sound speed, m/s Cp Surface pressure fluctuation coefficient, p /(ρ a u 2 a ) D Bypass nozzle diameter, m d wall distance, m f Frequency, Hz m Azimuthal mode number ṁ Mass flow rate, kg/s M a Mach number, |u|/c a p Pressure, Pa St Strouhal number (nondimensional frequency), f D/U

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Section: Introductionmentioning

confidence: 99%