Experimental Investigation of the Impact of 3D-Metal-Printed Perforated Leading Edges on Airfoil and Axial Fan Noise

Ocker C, Pannert W, Merkel M, Geyer T, Czwielong F, Krömer F, Becker S (2020)

Publication Language: English

Publication Type: Conference contribution, Conference Contribution

Publication year: 2020

Event location: Virtual Event

DOI: 10.2514/6.2020-2529

Abstract

An experimental investigation of the aerodynamic performance and noise emission of airfoils
and fan blades with perforated leading edges is presented. In a first step, a detailed
wind tunnel study was carried out. Therefore, measurements on sixteen airfoils with different
leading edge designs were performed for various flow speeds and geometric angles of attack.
The airfoils with perforated leading edges were made of an aluminum alloy using a powder
bed fusion based additive manufacturing process. For the measurements, two turbulence grids
were used to generate different inflow turbulence conditions. The aerodynamic performance
was captured with a wind tunnel balance and the acoustic measurements were performed using
a planar microphone array. Based on the results from that study, unskewed fan blades with
four different perforated leading edge designs were manufactured in a second step. With the
aim of reducing turbulence ingestion noise of axial fans, the axial fans were examined with
regard to their aerodynamics, total-to-static efficiency and sound emissions under free inflow
and grid-generated turbulent inflow conditions. The investigations on airfoils and fan blades
with perforated leading edge show a notable frequency-dependent noise reduction, but also a
loss of aerodynamic performance.

Authors with CRIS profile

Felix Czwielong Lehrstuhl für Prozessmaschinen und Anlagentechnik (iPAT) Florian Zenger Lehrstuhl für Prozessmaschinen und Anlagentechnik (iPAT) Stefan Becker Technische Fakultät

Additional Organisation(s)

Lehrstuhl für Prozessmaschinen und Anlagentechnik (iPAT)

Involved external institutions

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

How to cite

APA:

Ocker, C., Pannert, W., Merkel, M., Geyer, T., Czwielong, F., Krömer, F., & Becker, S. (2020). Experimental Investigation of the Impact of 3D-Metal-Printed Perforated Leading Edges on Airfoil and Axial Fan Noise. In Proceedings of the AIAA AVIATION 2020 FORUM. Virtual Event.

MLA:

Ocker, Christof, et al. "Experimental Investigation of the Impact of 3D-Metal-Printed Perforated Leading Edges on Airfoil and Axial Fan Noise." Proceedings of the AIAA AVIATION 2020 FORUM, Virtual Event 2020.

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