Scattering of turbulent-jet wavepackets by a swept trailing edge

Autor(es)

Piantanida, Selene ; Jaunet, Vincent ; Huber, Jerome ; Wolf, William R. ; Jordan, Peter ; Cavalieri, Andre V. G.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA; v. 140, n. 6, p. 4350-4359, DEC 2016.
• Citações Web of Science: 8

Resumo

Installed jet noise is studied by means of a simplified configuration comprising a flat plate in the vicinity of a round jet. The effects of Mach number, jet-plate radial distance, and trailing-edge sweep angle are explored. Acoustic measurements are performed using a traversable 18-microphone azimuthal array, providing pressure data at 360 points on a cylindrical surface surrounding the jet-plate system. Key observations include a decrease, with increasing Mach number, of the relative level of the scattered field in comparison to the uninstalled jet; an exponential dependence of the scattered sound pressure level on the radial jet-plate separation; and considerable sideline noise reductions with increasing sweep angle, with which there is an overall reduction in acoustic efficiency. The measurements are compared with results obtained using a kinematic wave-packet source model, whose radiation is computed in two ways. A TGF for a semi-infinite flat plate is used to provide a low-order approximation of the scattering effect. Use of a more computationally intensive boundary element method provides additional precision. Good agreement between model predictions and experiment, encouraging from the perspective of low-cost prediction strategies, demonstrates that the models comprise the essential sound generation mechanisms. (C) 2016 Acoustical Society of America. (AU)

• Processo FAPESP: 13/03413-4 - Investigação da geração e propagação de ruído em configurações aerodinâmicas utilizando aeroacústica computacional
• Beneficiário: William Roberto Wolf
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores