Descrizione del progetto
Indizi sulle interazioni tra onde acustiche e flussi aerodinamici per materiali fonoassorbenti più efficaci
I metodi intesi alla caratterizzazione dei materiali fonoassorbenti sono privi di una descrizione delle interazioni che avvengono tra onde acustiche e lo strato limite turbolento al di sopra della superficie di un materiale. Finanziato dal Consiglio europeo della ricerca, il progetto LINING approfondirà i misteriosi risultati sperimentali che si ottengono quando un’onda acustica incontra correnti d’aria turbolenta su superfici trattate con rivestimenti acustici. I ricercatori misureranno le velocità acustiche e idrodinamiche in prossimità di una superficie trattata acusticamente svolgendo nuovi esperimenti e simulazioni numeriche ad alta fedeltà. La descrizione delle modalità di interazione tra onde acustiche e flussi aerodinamici nell’ambito delle tecnologie per la riduzione del rumore generato dai motori aeronautici potrebbe spianare la strada allo sviluppo delle superfici fonoassorbenti del futuro, in grado di offrire una diminuzione del rumore e una minore resistenza.
Obiettivo
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.
Campo scientifico
- engineering and technologymechanical engineeringvehicle engineeringaerospace engineeringaircraft
- natural sciencesphysical sciencesclassical mechanicsfluid mechanicsfluid dynamics
- natural sciencesphysical sciencesacoustics
- engineering and technologymechanical engineeringvehicle engineeringaerospace engineeringaeronautical engineering
Parole chiave
Programma(i)
- HORIZON.1.1 - European Research Council (ERC) Main Programme
Argomento(i)
Meccanismo di finanziamento
ERC - Support for frontier research (ERC)Istituzione ospitante
10129 Torino
Italia