Acoustic radiation of subsonic jets in the vicinity of an inclined flat plate
| Autor: | André V. G. Cavalieri, José Rodrigues de Lima Neto Sirotto, William Wolf, Julio A. Cordioli, Petrônio A. S. Nogueira, Renato Fuzaro Miotto |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Jet (fluid) Acoustics and Ultrasonics Angle of attack Turbulence Acoustics Rotation 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics symbols.namesake Arts and Humanities (miscellaneous) Mach number 0103 physical sciences symbols Trailing edge Acoustic radiation 010301 acoustics Noise (radio) |
| Zdroj: | The Journal of the Acoustical Society of America. 146(1) |
| ISSN: | 1520-8524 |
| Popis: | Acoustic measurements of turbulent jets in the vicinity of a flat plate, mimicking a neighbouring wing, were compared to results from two wavepacket-based source models previously studied in the literature: the Tailored Green's Function method, which considers the radiation of the turbulent structure in the vicinity of a semi-infinite flat plate, and the Boundary Element Method, which can represent the full geometry of the plate used in the experiments. Particular interest is given to analysing how the angle of attack of the plate (α) affects the sound radiated by an installed jet with trailing edge 6 diameters away from the nozzle and 1 diameter away from the centerline for 0° ≤ α ≤ 45°. The results herein confirm the behaviour identified by the models: the scattered acoustic field follows the rotation of the plate, shifting a silence region with negligible scattered sound, and creating regions with lower noise levels in positions that correspond to the ground for an aircraft with engines under its wings. This is further explored by means of a Mach number analysis for M = 0.5, 0.7, and 0.9, showing that this trend is present whenever trailing-edge scattering of jet disturbances is dominant in the acoustic field. |
| Databáze: | OpenAIRE |
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