Bibliographic Details
| Title: |
Experimental Study of Trailing-Edge Bluntness Noise Reduction by Porous Plates. |
| Authors: |
Kershner, John R.1, Jaworski, Justin W.2, Geyer, Thomas F.3 |
| Source: |
AIAA Journal. Oct2024, Vol. 62 Issue 10, p3813-3824. 12p. |
| Abstract: |
The acoustic and aerodynamic fields of blunt porous plates are examined experimentally in an effort to mitigate trailing-edge bluntness noise. The plates are characterized by a single dimensionless porosity parameter identified in previous works that controls the influence of porosity on the sound field. Hot-wire anemometry interrogates the velocity field to connect turbulence details of specific regions to flow noise directivity and beamforming source maps. Porous plates are demonstrated to reduce the bluntness-induced noise by up to 17 dB and progressively suppress broadband low-frequency noise as the value of the porosity parameter increases. However, an increase in this parameter also increases the high-frequency noise created by the pores themselves. The same highly perforated plate characterized by a large value of the porosity parameter reduces the bluntness-induced vortex shedding that is present in the wake of the impermeable plate. Lastly, pore shape and positional alignment are shown to have a complex effect on the acoustic field. Among the porosity designs considered, plates with circular pores are most effective for low-frequency noise reductions but generate high-frequency noise. No meaningful difference is found between the acoustic spectra from plates of the same open-area fraction with pores aligned along or staggered about the flow direction. [ABSTRACT FROM AUTHOR] |
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| Database: |
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