Aeroacoustic Noise Management in Aerodynamic Systems
Summary
Aeroacoustic noise arises when turbulent flow interacts with solid surfaces or edges, generating pressure fluctuations that radiate as sound. In aerodynamic systems such as aircraft wings, wind‐turbine blades and turbomachinery, the dominant noise mechanisms include turbulent boundary‐layer scattering at trailing edges, laminar–turbulent transition tones and separation‐bubble instabilities. Noise management encompasses prediction and mitigation, utilising theoretical models (for example, acoustic analogies and Green’s function approaches), high‐fidelity numerical simulations (large eddy simulation and direct numerical simulation) and controlled experiments (particle image velocimetry, microphone phased arrays). Passive treatments—trailing‐edge serrations, poroelastic coatings, perforated fairings and biomimetic features inspired by owl feathers—modify flow structures or promote destructive interference. Active techniques, such as adaptive surfaces and flow control actuators, offer dynamic noise suppression. Improvements in prediction fidelity and the integration of mitigation measures are driving quieter designs that meet increasingly stringent environmental and regulatory standards, while sustaining aerodynamic performance in both transport and renewable energy applications.
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Aeroacoustic Noise Management in Aerodynamic Systems publication trend
The graph below shows the total number of articles in aeroacoustic noise management in aerodynamic systems across all publications each year (not limited to Nature Index journals).
Technical terms
Aeroacoustics: The study of noise generation and propagation in fluid flows around aerodynamic bodies.
Turbulent boundary layer: The region of chaotic fluid motion adjacent to a surface, where fluctuations in velocity and pressure interact strongly.
Trailing-edge serrations: Engineered tooth-like modifications at an aerofoil’s rear edge designed to break up coherent turbulence and induce destructive interference.
Acoustic analogy: A theoretical framework that reformulates the Navier–Stokes equations into equivalent acoustic source terms, enabling prediction of far-field sound from turbulent flows.
References
- Low-cost wind turbine aeroacoustic predictions using actuator lines. Renewable Energy (2024).
- Turbulent boundary layer trailing-edge noise: Theory, computation, experiment, and application. Progress in Aerospace Sciences (2021).
- Noise reduction mechanisms of an open-cell metal-foam trailing edge. Journal of Fluid Mechanics (2020).
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