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Reduction of Turbulence Interaction Noise Through Airfoils With Perforated Leading Edges

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With the aim of reducing turbulence interaction noise of axial fans, a wind tunnel study was performed on airfoils equipped with a flow permeable leading edge. The leading edges were realized as bulk materials with round pores and manufactured using rapid prototyping. The inflow turbulence was generated by a turbulence grid. Acoustic measurements were performed using microphone array technology, while simultaneously the aerodynamic performance was captured with a wind tunnel balance. In order to provide insight on the flow phenomena at the perforated leading edges, a RANS simulation was performed. The results show that a noticeable noise reduction up to 8 dB is possible in a frequency range between 1 kHz and 4 kHz, while for leading edges with large pores additional high frequency noise is generated. At low geometric angles of attack from 0° to 8°, the aerodynamic performance of the modified airfoils is the same as for a reference airfoil with solid leading edge. At higher angles of attack the perforated leading edges lead to an aerodynamic penalty.
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Document Type: Research Article

Publication date: January 1, 2019

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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