Experimental Study of Trailing-Edge Bluntness Noise Reduction by Porous Plates

被引:1
|
作者
Kershner, John R. [1 ]
Jaworski, Justin W. [2 ]
Geyer, Thomas F. [3 ,4 ]
机构
[1] Lehigh Univ, Dept Mech Engn, Bethlehem, PA 18015 USA
[2] Virginia Polytech Inst & State Univ, Kevin T Crofton Dept Aerosp & Ocean Engn, Blacksburg, VA 24061 USA
[3] German Aerosp Ctr DLR, Inst Electrified Aero Engines, D-03046 Cottbus, Germany
[4] Brandenburg Univ Technol Cottbus Senftenberg, Tech Acoust Grp, D-03046 Cottbus, Germany
关键词
Aircraft Wing Design; Overall Sound Pressure Level; Boundary Layer Thickness; Turbulence Intensity; Free Stream Velocity; Porous Materials; Noise Reduction; Aeroacoustic Noise; Trailing Edge Noise; Vortex Shedding; DUCT ACOUSTIC PROPERTIES; AERODYNAMIC SOUND; GENERATION; SCATTERING; NUMBER; FLIGHT; FLOW;
D O I
10.2514/1.J064045
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
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.
引用
收藏
页码:3813 / 3824
页数:12
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