Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
The Effects of a Poroelastic Plate Extension in the Sound Scattering of a NACA0012 Airfoil
Submission Author:
Cristiano Pimenta , SP
Co-Authors:
William Wolf, André Cavalieri
Presenter: Cristiano Pimenta
doi://10.26678/ABCM.ENCIT2016.CIT2016-0074
Abstract
The scattering of sound from a NACA0012 airfoil with a poroelastic plate extension is investigated through a numerical methodology. The boundary element method is applied to solve the Helmholtz equation subjected to the boundary conditions associated to the vibration of the plate. The poroelastic plate is considered as a cantilever configuration installed in the trailing edge of a NACA0012 airfoil. A pseudospectral method is implemented to obtain the structural modal basis subjected to the boundary conditions of a clamped-free plate. The modal basis of the plate is then used as a boundary condition to couple the interaction between sound scattering and the structural phenomenon. The scattered sound is produced by a point quadrupole source which represents the sound from a turbulent vortex. Different Helmholtz numbers based on the chord are investigated. A model is employed to represent the effects of perforations in the plate surface. A parametric study is performed for a two-dimensional case where the effects of porosity, elasticity and length of the plate extension is investigated in terms of scattered sound level.
Keywords
Aeroacoustics, wind noise, Sound-Structure Interaction
