In-flight source noise of an advanced large-scale single-rotation propeller

Woodward, Richard P.; Loeffler, I. J.

doi:10.2514/3.46435

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…[39,40]). Full-scale in-flight campaign [14,15] using the SR-7L advance propeller [16,17]: acoustic measurements, near and far from the propeller, to map the noise source directivity pattern under a wide set of operating conditions (altitude,…”

Section: Introductionmentioning

confidence: 99%

Propeller installation effects on turboprop aircraft acoustics

Chirico

Barakos

Bown³

2018

Journal of Sound and Vibration

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Section: Introductionmentioning

confidence: 99%

Propeller installation effects on turboprop aircraft acoustics

Chirico

Barakos

Bown³

2018

Journal of Sound and Vibration

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“…at a higher advance ratio, further increasing the blade pitch. Therefore, this design will also benefit from the decrease in the tip Mach number, which results in a significant propeller noise reduction (refer to (62,63) that report wind tunnel or in-flight experimental data showing a decrease in the noise levels of the first tones with decreasing tip speed). The main idea behind the different hub designs is instead a modulation of the noise spectra by changing the geometric periodicity of the propeller, thus to redistribute the acoustic energy on more frequencies.…”

Section: Hmb3 Validation For Propellersmentioning

confidence: 99%

Numerical aeroacoustic analysis of propeller designs

Chirico

Barakos

Bown³

2017

Aeronaut. j.

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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 CFD method is able to reproduce the tonal content of all blades and its dependence on hub and blade design features.

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“…Significant efforts have also been made to understand noise sources of aircraft propellers, [5][6][7][8] which, conversely to helicopters (except in ascending and descending flight) typically operate under axial flow conditions and usually feature more than two blades. Nevertheless, aircraft propellers and helicopter rotors share some similarities in their operating conditions, with comparable rotation speeds, characteristic Reynolds and Mach numbers.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis of the influence of solidity on rotor aeroacoustics at low Reynolds numbers

Jardin

Gojon

Doué

et al. 2023

International Journal of Aeroacoustics

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We compare medium and high fidelity numerical simulations to experiments conducted on low Reynolds number rotors typical of small scale Unmanned Aircraft Systems (UAS). We first show that these numerical approaches provide reasonable estimates of the aerodynamic performance and farfield tonal noise and hence apply them for the investigation of the influence of solidity ratio on the aerodynamics and acoustics of small scale rotors operating under hovering, iso-thrust conditions. We show that while solidity ratio has a weak impact on aerodynamic performance, it may help drastically reduce farfield tonal noise. This reduction is however found to depend on the interplay between thickness and loading noise such that increasing the solidity by increasing the number of blades at constant blades’ aspect ratio or by decreasing the blades’ aspect ratio keeping the number of blades constant may yield very different, sometimes opposite, trends.

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In-flight source noise of an advanced large-scale single-rotation propeller

Cited by 4 publications

References 6 publications

Propeller installation effects on turboprop aircraft acoustics

Propeller installation effects on turboprop aircraft acoustics

Numerical aeroacoustic analysis of propeller designs

Numerical and experimental analysis of the influence of solidity on rotor aeroacoustics at low Reynolds numbers

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