On the Adjoint-based Control of Trailing-Edge Turbulence and Noise Minimization via Porous Material

2015 ◽  
Author(s):  
Beckett Yx Zhou ◽  
Nicolas R. Gauger ◽  
Seong Ryong Koh ◽  
Matthias H. Meinke ◽  
Wolfgang Schroeder
Keyword(s):  
Porous Material ◽  
Trailing Edge

scholarly journals Self Noise Reduction and Aerodynamics of Airfoils With Porous Trailing Edges

Acoustics ◽  
2019 ◽  
Vol 1 (2) ◽  
pp. 393-409 ◽  
Author(s):  
Thomas Fritz Geyer ◽  
Ennes Sarradj
Keyword(s):  
Porous Material ◽  
Porous Materials ◽  
Microphone Array ◽  
Aerodynamic Performance ◽  
Aerodynamic Noise ◽  
Trailing Edge ◽  
Suitable Material ◽  
Trailing Edge Noise ◽  
Negative Effect ◽  
Noticeable Reduction

The application of open-porous materials is a possible method to effectively reduce the aerodynamic noise of an airfoil. However, the porous consistency may have a negative effect on the aerodynamic performance of the airfoil, since very often the lift is decreased while the drag increases. In a recent investigation, the generation of trailing edge noise of a set of airfoil models made from different porous materials was examined experimentally. The materials were characterized mainly by their airflow resistivity. Besides the material, the chordwise extent of the porous material was varied, which was done by covering the front part of the porous airfoil with a thin, impermeable adhesive foil. Acoustic measurements were performed in an open jet wind tunnel using microphone array technology, while the aerodynamic performance was measured simultaneously using a six-component balance. In general, both the airflow resistivity and the extent of the porous material have an influence on the trailing edge noise. However, if a suitable material is chosen, the results show that a noticeable reduction of trailing edge noise is possible even with only a small chordwise extent of the porous material.

Effect of porous material on trailing edge sound sources of a lifting airfoil by zonal Overset-LES

2020 ◽  
Vol 480 ◽  
pp. 115386 ◽  
Author(s):  
V.B. Ananthan ◽  
P. Bernicke ◽  
R.A.D. Akkermans ◽  
T. Hu ◽  
P. Liu
Keyword(s):  
Porous Material ◽  
Trailing Edge ◽  
Sound Sources

Adjoint-based Trailing-Edge Noise Minimization using Porous Material

2014 ◽  
Author(s):  
Beckett Yx Zhou ◽  
Nicolas R. Gauger ◽  
Seong Ryong Koh ◽  
Matthias H. Meinke ◽  
Wolfgang Schroeder
Keyword(s):  
Porous Material ◽  
Trailing Edge ◽  
Trailing Edge Noise

A Discrete Adjoint Framework for Trailing-Edge Turbulence Control and Noise Minimization via Porous Material

2016 ◽  
Author(s):  
Beckett Yx Zhou ◽  
Nicolas R. Gauger ◽  
Seong R. Koh ◽  
Matthias H. Meinke ◽  
Wolfgang Schroeder
Keyword(s):  
Porous Material ◽  
Trailing Edge ◽  
Turbulence Control ◽  
Discrete Adjoint

A discrete adjoint framework for trailing-edge noise minimization via porous material

2018 ◽  
Vol 172 ◽  
pp. 97-108 ◽  
Author(s):  
Beckett Y. Zhou ◽  
Seong Ryong Koh ◽  
Nicolas R. Gauger ◽  
Matthias Meinke ◽  
Wolfgang Schöder
Keyword(s):  
Porous Material ◽  
Trailing Edge ◽  
Trailing Edge Noise ◽  
Discrete Adjoint

Random pseudo promptings applied to the thermal characterization of a wet porous material

1999 ◽  
Vol 6 (1) ◽  
pp. 101-108 ◽  
Author(s):  
E. Delacre ◽  
D. Defer ◽  
E. Antczak ◽  
B. Duthoit
Keyword(s):  
Porous Material ◽  
Thermal Characterization
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