Numerical analysis of the impact of variable porosity on trailing-edge noise

被引:15
|
作者
Koh, Seong Ryong [1 ,2 ]
Zhou, Beckett [4 ]
Meinke, Matthias [1 ,2 ,3 ]
Gauger, Nicolas [4 ]
Schroeder, Wolfgang [1 ,2 ,3 ]
机构
[1] Rhein Westfal TH Aachen, Inst Aerodynam, Wullnerstr 5a, D-52062 Aachen, Germany
[2] Rhein Westfal TH Aachen, Chair Fluid Mech, Wullnerstr 5a, D-52062 Aachen, Germany
[3] Forschungszentrum Julich, JARA High Performance Comp, D-52425 Julich, Germany
[4] TU Kaiserslautern, Chair Sci Comp, D-67663 Kaiserslautern, Germany
关键词
Porous material; Trailing-edge noise; Darcy drag; Noise reduction; Optimization; FINITE-DIFFERENCE SCHEMES; POROUS-MEDIA; TURBULENT-FLOW; MOMENTUM-TRANSFER; PROPAGATION; BOUNDARY; SIMULATION; PERMEABILITY; COMPUTATION; EQUATION;
D O I
10.1016/j.compfluid.2018.02.015
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
The impact of porous material with variable properties on trailing-edge noise is analyzed by a high resolution large-eddy simulation/computational aeroacoustics (LES/CAA) approach. Two trailing edge shapes, i.e., a sharp edge and a rounded edge, with solid and porous surfaces are considered. The numerical solution of the rounded corner trailing edge is validated by experimental data of surface pressure and acoustic spectra. The viscous dissipation in the porous structures directly influences the acoustic attenuation by reducing the correlation length of the turbulent eddies and the flow acceleration near the trailing edge. At zero angle-of-attack the porous surface is extremely effective to reduce the tone and the broadband noise. An optimized porosity distribution further decreases the tone amplitude. At increasing angle-of-attack the enhanced flow momentum in the direction of streamline curvature enlarges the turbulent length scale and the maximum turbulence intensity. The acoustic field of the porous trailing edges is dominated by a large turbulent scale enhanced by the streamline curvature variation. The low-frequency acoustics increases and its wave propagation is more pronounced in the downstream direction. Nevertheless, the porous trailing edge is an effective means to lower the noise by 4 dB reduction in the upstream direction. (C)2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:66 / 81
页数:16
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