Influence of a micro-perforated duct absorber on sound emission and performance of axial fans

Czwielong F, Floss S, Kaltenbacher M, Becker S (2020)

Publication Language: English

Publication Type: Journal article

Publication year: 2020

Journal

Applied Acoustics Elsevier

URI: https://www.sciencedirect.com/science/article/pii/S0003682X20308501?via=ihub

DOI: 10.1016/j.apacoust.2020.107746

Open Access Link: https://authors.elsevier.com/a/1cBkP,5Mxf0GL

Abstract

In this article we investigate the influence of varying flow conditions on the acoustic behaviour of a
micro-perforated panel absorber (MPA), applied in the vicinity of an axial fan. The predesign of the
MPA was conducted by using the Finite Element Method (FE) in combination with porous material modelling
approaches. Experimental results of emitted sound spectra and fan characteristic of different fan
blade geometries, positioning of the fan to the absorber, as well as changes in turbulent intensity are presented.
The studies showed that the investigated MPA duct reduces the overall sound pressure level emitted
by the fan by up to 16 dB while maintaining the same efficiency and pressure build-up. From an
acoustic and aerodynamic point of view, it was more efficient if the fan operate downstream of the
MPA instead of within the MPA. This arrangement increased the efficiency and avoided high-frequency
sound generation, which is caused by the flow through the MPA. The results show that the function of
the MPA can be used for different fan geometries and that inlet turbulence improves the properties of
the absorber.

Authors with CRIS profile

Felix Czwielong Lehrstuhl für Prozessmaschinen und Anlagentechnik Stefan Becker Technische Fakultät

Additional Organisation(s)

Lehrstuhl für Prozessmaschinen und Anlagentechnik

Involved external institutions

Technische Universität Wien / Vienna University of Technology AT Austria (AT)

How to cite

APA:

Czwielong, F., Floss, S., Kaltenbacher, M., & Becker, S. (2020). Influence of a micro-perforated duct absorber on sound emission and performance of axial fans. Applied Acoustics. https://dx.doi.org/10.1016/j.apacoust.2020.107746

MLA:

Czwielong, Felix, et al. "Influence of a micro-perforated duct absorber on sound emission and performance of axial fans." Applied Acoustics (2020).

BibTeX: Download