Special Issue “Aeroacoustics and Noise Mitigation”

Yao, Huadong

doi:10.3390/aerospace10070594

Cited by 1 publication

(2 citation statements)

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“…In specific cases, quadrupole sources are approximated by modeling permeable surfaces around physical noise sources to compute the far-field acoustic pressure [36]. To create a dispersed wave equation with sound sources, the FW-H equation revamps the Navier-Stokes equations and the continuity formula [37]. This equation adds arbitrary convective motion to the Lighthill-Curle theory of aerodynamic noise [32] to relate the fluctuating surface pressure distribution on an aerodynamic body or surface to the far-field Sound Pressure Level (SPL) it generates [38].…”

Section: Methodsmentioning

confidence: 99%

“…Green's function [40][41][42][43] was also introduced as a solution for the FW-H equation [37] for computing the correlation of elastic or acoustic propagation in ideal lossless mediums [44]. Furthermore, Amiet [45][46][47] and Howe [48,49] simplified the process of defining sound dispersion by explaining the variation in the disturbance in the BL.…”

Section: Methodsmentioning

confidence: 99%

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Recent Advances in Airfoil Self-Noise Passive Reduction

Amirsalari,

Rocha

2023

Aerospace

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Airflow-induced noise prediction and reduction is one of the priorities for both the energy and aviation industries. This review paper provides valuable insights into flow-induced noise computation, prediction, and optimization methods with state-of-the-art efforts in passive noise reduction on airfoils, blades, and wings. This review covers the combination of several approaches in this field, including analytical, numerical, empirical, semi-empirical, artificial intelligence, and optimization methods. Under passive noise reduction techniques, leading and trailing edge treatments, porous materials, controlled diffusion airfoils, morphing wings, surface treatments, and other unique geometries that researchers developed are among the design modification methods discussed here. This work highlights the benefits of incorporating multiple techniques to achieve the best results concerning the desired application and design. In addition, this work provides an overview of the advantages and disadvantages of each tool, with a particular emphasis on the possible challenges when implementing them. The methods and techniques discussed herein will help increase the acoustic efficiency of aerial structures, making them a beneficial resource for researchers, engineers, and other professionals working in aviation noise reduction.

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