Artículos de revistas
Scattering Of Turbulent-jet Wavepackets By A Swept Trailing Edge
Registro en:
The Journal Of The Acoustical Society Of America. Acoustical Soc Amer Amer Inst Physics, v. 140, p. 4350 - 4359, 2016.
0001-4966
1520-8524
WOS:000390347900040
10.1121/1.4971425
Autor
Piantanida
Selene; Jaunet
Vincent; Huber
Jerome; Wolf
William R.; Jordan
Peter; Cavalieri
Andre V. G.
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) 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. 140 6 4350 4359 EU [FP7-AAT-2012-RTD-1, 314692] Airbus Fundacao de Amparo a Pesquisa do Estado de Sao Paulo, FAPESP [2013/03413-4] Science without Borders program [A073/2013] Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)