Permeable Leading Edges for Airfoil and Fan Noise Reduction in Disturbed Inflow

Ocker C, Geyer T, Czwielong F, Krömer F, Pannert W, Merkel M, Becker S (2021)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2021

Journal

AIAA Journal American Institute of Aeronautics and Astronautics

DOI: 10.2514/1.J060396

Abstract

A detailed experimental study on the aerodynamic performance and noise emission of airfoils and fan blades with permeable leading edges under disturbed inflow conditions was performed. The airfoils and fan blades with permeable leading edges were made of an aluminum alloy using a powder bed fusion-based additive manufacturing process. In a first step, a wind-tunnel study was carried out. This consisted of detailed aerodynamic and aeroacoustic measurements on 16 airfoils with different permeable leading-edge designs that were performed for various flow speeds and geometric angles of attack. Based on the results from that study, unskewed fan blades with four different permeable leading-edge designs were manufactured in a second step. With the aim of reducing turbulence interaction noise of axial fans, the fans were examined with regard to their aerodynamic and acoustic properties under grid-generated turbulent inflow conditions. In a third step, a possible transfer of the observed noise emission from airfoils with permeable leading edge to that of fan blades was investigated. It was found that a notable broadband noise reduction can be transferred from airfoil applications to the sound spectra of axial fans. At the same time, the porous modifications can reduce the aerodynamic performance, and hence the fan efficiency.

Authors with CRIS profile

Felix Czwielong Lehrstuhl für Prozessmaschinen und Anlagentechnik Florian Zenger Lehrstuhl für Prozessmaschinen und Anlagentechnik Stefan Becker Lehrstuhl für Prozessmaschinen und Anlagentechnik

Additional Organisation(s)

Lehrstuhl für Prozessmaschinen und Anlagentechnik

Involved external institutions

Hochschule Aalen DE Germany (DE) Brandenburgische Technische Universität Cottbus-Senftenberg (BTU) DE Germany (DE)

How to cite

APA:

Ocker, C., Geyer, T., Czwielong, F., Krömer, F., Pannert, W., Merkel, M., & Becker, S. (2021). Permeable Leading Edges for Airfoil and Fan Noise Reduction in Disturbed Inflow. AIAA Journal. https://doi.org/10.2514/1.J060396

MLA:

Ocker, Christof, et al. "Permeable Leading Edges for Airfoil and Fan Noise Reduction in Disturbed Inflow." AIAA Journal (2021).

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