Descripción del proyecto
El conocimiento de las interacciones acústico-fluidales podría conducir a materiales de aislamiento acústico más eficaces
Los métodos de caracterización de los materiales de aislamiento acústico se ven afectados por la falta de descripción de las interacciones entre las ondas acústicas y la capa límite turbulenta sobre la superficie del material. El equipo del proyecto LINING, financiado por el Consejo Europeo de Investigación, investigará hallazgos experimentales inexplicables descubiertos cuando una onda sonora encuentra corrientes de aire turbulento sobre superficies tratadas con revestimientos acústicos. Los investigadores medirán las velocidades acústica e hidrodinámica cerca de una superficie tratada acústicamente con nuevos experimentos y simulaciones numéricas de alta fidelidad. Describir cómo interactúan el flujo y la acústica en las tecnologías de reducción del ruido de los motores de los aviones podría allanar el camino para el desarrollo de futuras superficies de insonorización con mayor reducción del ruido y menor resistencia aerodinámica.
Objetivo
The lack of fundamental knowledge of the interaction between an acoustic wave and a turbulent boundary layer grazing an acoustically treated surface, such as an acoustic liner, is the cause of unexpected and unphysical results found when performing the acoustic characterization of the sound absorbing surface with inverse eduction methods. This is because, in this field, acoustic and aerodynamic have never been fully coupled.
To fill this knowledge gap, the acoustic and hydrodynamic velocities near an acoustically treated surface must be measured. Since it cannot be done only with state-of-the-art experiments, because of hardware and field-of-view limitations, I propose to complement experiments with scale-resolved high-fidelity numerical simulations based on the lattice-Boltzmann very-large-eddy simulation method.
Numerical results will be used to explain the physics of the acoustic-flow interaction. Advanced data analysis methodologies will be developed and applied to separate the acoustic-induced velocity near the wall from the hydrodynamic one. At the same time, the numerical database will be used to compare inverse methods, employed to acoustically characterize the sound absorbing surfaces, in order to explain the physical reasons behind the unexpected results, and propose physics-based corrections. Furthermore, by describing the flow-acoustic interaction, it will be possible to model and predict the drag increase caused by the coupling between the acoustic-induced velocity and the free-stream one.
My description of the flow-acoustic interaction will solve the scientific debate about the unexpected results and pave the way towards future broadband low-noise low-drag acoustic meta-surfaces to increase propulsion efficiency and reduce noise of future, more sustainable, aircraft engines.
Ámbito científico
- engineering and technologymechanical engineeringvehicle engineeringaerospace engineeringaircraft
- natural sciencesphysical sciencesclassical mechanicsfluid mechanicsfluid dynamics
- natural sciencesphysical sciencesacoustics
- engineering and technologymechanical engineeringvehicle engineeringaerospace engineeringaeronautical engineering
Palabras clave
Programa(s)
- HORIZON.1.1 - European Research Council (ERC) Main Programme
Régimen de financiación
ERC - Support for frontier research (ERC)Institución de acogida
10129 Torino
Italia