Numerical aeroacoustic analysis of propeller designs

As propeller-driven aircraft are the best choice for short/middle-haul flights but their acoustic emissions may require improvements to comply with future noise certification standards, this work aims to numerically evaluate the acoustics of different modern propeller designs. Overall sound pressure...

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Bibliographic Details
Published in:Aeronautical journal 2018-02, Vol.122 (1248), p.283-315
Main Authors: Chirico, G., Barakos, G. N., Bown, N.
Format: Article
Language:English
Subjects:
Acoustic emission testing
Acoustic noise
Acoustics
Aerodynamics
Aircraft
Aircraft compartments
Aircraft design
Aircraft noise
Airframes
Aviation
Computational fluid dynamics
Fourier transforms
Fuselages
Laboratories
Noise
Noise spectra
Numerical analysis
Reynolds number
Sound pressure
Transfer functions
Turboprop aircraft
Velocity
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Summary:As propeller-driven aircraft are the best choice for short/middle-haul flights but their acoustic emissions may require improvements to comply with future noise certification standards, this work aims to numerically evaluate the acoustics of different modern propeller designs. Overall sound pressure level and noise spectra of various blade geometries and hub configurations are compared on a surface representing the exterior fuselage of a typical large turboprop aircraft. Interior cabin noise is also evaluated using the transfer function of a Fokker 50 aircraft. A blade design operating at lower RPM and with the span-wise loading moved inboard is shown to be significantly quieter without severe performance penalties. The employed Computational Fluid Dynamics (CFD) method is able to reproduce the tonal content of all blades and its dependence on hub and blade design features.
ISSN:0001-9240
2059-6464
DOI:10.1017/aer.2017.123