Next Article in Journal
An Enhanced Temporal Feature Integration Method for Environmental Sound Recognition
Previous Article in Journal
Study on the Output Performance of a Nonlinear Hybrid Piezoelectric-Electromagnetic Harvester under Harmonic Excitation
Open AccessArticle

Self Noise Reduction and Aerodynamics of Airfoils with Porous Trailing Edges

1
Technical Acoustics Group, Brandenburg University of Technology Cottbus-Senftenberg, 03046 Cottbus, Germany
2
Institute of Fluid Mechanics and Engineering Acoustics, Technical University of Berlin, 10587 Berlin, Germany
*
Author to whom correspondence should be addressed.
Acoustics 2019, 1(2), 393-409; https://doi.org/10.3390/acoustics1020022
Received: 28 January 2019 / Revised: 28 March 2019 / Accepted: 14 April 2019 / Published: 24 April 2019
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. View Full-Text
Keywords: porous airfoils; trailing edge; noise reduction; aerodynamics; wind tunnel; microphone array porous airfoils; trailing edge; noise reduction; aerodynamics; wind tunnel; microphone array
Show Figures

Figure 1

MDPI and ACS Style

Geyer, T.F.; Sarradj, E. Self Noise Reduction and Aerodynamics of Airfoils with Porous Trailing Edges. Acoustics 2019, 1, 393-409.

Show more citation formats Show less citations formats

Article Access Map by Country/Region

1
Back to TopTop