| Full text | |
| Author(s): |
Piantanida, Selene
;
Jaunet, Vincent
;
Huber, Jerome
;
Wolf, William R.
;
Jordan, Peter
;
Cavalieri, Andre V. G.
Total Authors: 6
|
| Document type: | Journal article |
| Source: | JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA; v. 140, n. 6, p. 4350-4359, DEC 2016. |
| Web of Science Citations: | 8 |
| Abstract | |
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) | |
| FAPESP's process: | 13/03413-4 - Investigation of noise generation and propagation by aerodynamic configurations using computational aeroacoustics |
| Grantee: | William Roberto Wolf |
| Support Opportunities: | Research Grants - Young Investigators Grants |