CUED Publications database

LES-RANS of installed ultra-high bypass-ratio coaxial jet aeroacoustics with a finite span wing-flap geometry and flight stream – part 2: Chevron nozzles

Wang, ZN and Tyacke, J and Tucker, P (2017) LES-RANS of installed ultra-high bypass-ratio coaxial jet aeroacoustics with a finite span wing-flap geometry and flight stream – part 2: Chevron nozzles. In: 23rd AIAA/CEAS Aeroacoustics Conference. AIAA AVIATION Forum . American Institute of Aeronautics and Astronautics.

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Abstract

© 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. Chevrons are considered as an efficient passive way to reduce jet noise. Hybrid Large-Eddy Simulation (LES) and Reynolds-Averaged Navier-Stokes (RANS) is performed on an ultra-high bypass-ratio coaxial jet with chevrons on the outer nozzle. The Ffowcs Williams-Hawkings equation is used to predict farfield sound. Chevron effects are discussed with and without a finite span wing installation. The results are analyzed in terms of both near-field turbulence and far-field sound. Space-time correlations are also used to investigate turbulent spatio-temporal dynamics and sound sources. The results show that chevrons can reduce sound sources in the shear layer and the jet and wing/flap interactions, leading to noise reduction at both insolated and installed jets.

Item Type: Book Section
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Div A > Turbomachinery
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:55
Last Modified: 10 Aug 2017 01:35
DOI: