Acoustic liners for jet-installation noise reduction

Rego, Leandro F.; Avallone, Francesco; Ragni, Daniele; Casalino, Damiano; Denayer, Hervé

doi:10.1016/j.jsv.2022.117189

Cited by 9 publications

(1 citation statement)

References 30 publications

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“…Porous media inserted in the flap trailing edge can yield up to 10 dB noise reduction when the flap is located in the hydrodynamic region of the jet [23][24][25][26]. Acoustic liners on the flap [27] showed also noise reductions in the order of 7 dB and 10 dB on the far-field spectra, at the resonant frequency of single and double degree-of-freedom liners, respectively. A flexible trailing edge [28] yields also a decrease of the installed jet noise by about 2 dB on the overall sound pressure level.…”

Section: Introductionmentioning

confidence: 99%

Jet noise and wing installation effects of circular, beveled and rectangular nozzles

Christophe

Decker

Schram

2023

Preprint

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With the growth of modern turbofan engines, their integration under the wing becomes challenging and induces aerodynamic and acoustic interactions between the jet exhaust and the airframe. Jet noise reduction techniques have been widely studied over the past decades but their efficiency has still to be demonstrated once installed. The present lab-scale jet experiments at Mach 0.6 compare the noise radiated by beveled and rectangular installed nozzles to circular ones on a quarter-sphere radiation map using a microphone antenna. For all radiation angles, modified nozzles show an amplitude decrease of the jet-plate interaction tones of the noise spectra attributed to a strong coupling between the jet shear layers and the sound scattering at the plate trailing edge. Circular nozzles achieve a noise reduction for all radiation angles with a maximum decrease up to 2~dB at receiver locations perpendicular to the plate. While rectangular nozzles show a similar behavior, a sound increase is observed for listeners parallel to the plate when the height-to-width ratio is small.

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Section: Introductionmentioning

confidence: 99%

Jet noise and wing installation effects of circular, beveled and rectangular nozzles

Christophe

Decker

Schram

2023

Preprint

View full text Add to dashboard Cite

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Jet Noise and Wing Installation Effects of Circular, Beveled and Rectangular Nozzles

Christophe,

de Decker,

Schram

2024

Flow Turbulence Combust

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With the growth of modern turbofan engines, their integration under the wing becomes challenging and induces aerodynamic and acoustic interactions between the jet exhaust and the airframe. Jet noise reduction techniques have been widely studied over the past decades but their efficiency has still to be demonstrated once installed. The present lab-scale jet experiments at Mach 0.6 compare the noise radiated by beveled and rectangular installed nozzles to circular ones on a quarter-sphere radiation map using a microphone antenna. For all radiation angles, modified nozzles show an amplitude decrease of the jet-plate interaction tones of the noise spectra attributed to a strong coupling between the jet shear layers and the sound scattering at the plate trailing edge. Beveled nozzles achieve a noise reduction for all radiation angles with a maximum decrease up to 2 dB at receiver locations perpendicular to the plate. While rectangular nozzles show a similar behavior, a sound increase is observed for listeners parallel to the plate when the height-to-width ratio is small.

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Optimal ultra-broadband sound-absorption performance design for coiled up space structures with nonlinear robustness

Wang,

Chen,

Liu

2025

Applied Acoustics

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Acoustic liners for jet-installation noise reduction

Cited by 9 publications

References 30 publications

Jet noise and wing installation effects of circular, beveled and rectangular nozzles

Jet noise and wing installation effects of circular, beveled and rectangular nozzles

Jet Noise and Wing Installation Effects of Circular, Beveled and Rectangular Nozzles

Optimal ultra-broadband sound-absorption performance design for coiled up space structures with nonlinear robustness

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