Achieving axial fan sound reduction with micro-perforated absorbers

Floss S, Czwielong F, Krömer F, Becker S, Kaltenbacher M (2019)

Publication Language: English

Publication Type: Conference contribution, Conference Contribution

Publication year: 2019

Pages Range: 1410-1413

Conference Proceedings Title: Fortschritte der Akustik - DAGA 2019 45. Deutsche Jahrestagung für Akustik, 18.-21. März 2019 in Rostock

Event location: Rostock

Abstract

Aeroacoustic noise sources, especially under distorted flow conditions,
are one of the main causes of sound emissions on an axial fan geometry
layout in a complex ventilation system scenario. To attenuate sound,
one can either modify the aeroacoustic sources by changing the fan blade
geometry, or one can use passive absorbing mechanisms which are
applied as wall lined structures up- and downstream of the fan. We propose
the application of MPAs (micro-perforated absorbers) in the tipflow
region of the fan to account for tonal components of the emitted sound
pressure spectrum. Possible near-field effects on the absorbing structure
will be investigated by simulating MPAs with the Johnson-Champoux-
Allard approach in a Finite Element (FE) - framework . This is followed
by measurements at an experimental test section where we will investigate
the effect of the MPA structure on pressure drop, performance and
the overall emitted sound pressure level of the fan.

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

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

How to cite

APA:

Floss, S., Czwielong, F., Krömer, F., Becker, S., & Kaltenbacher, M. (2019). Achieving axial fan sound reduction with micro-perforated absorbers. In Deutsche Gesellschaft für Akustik - DEGA (Eds.), Fortschritte der Akustik - DAGA 2019 45. Deutsche Jahrestagung für Akustik, 18.-21. März 2019 in Rostock (pp. 1410-1413). Rostock.

MLA:

Floss, Sebastian, et al. "Achieving axial fan sound reduction with micro-perforated absorbers." Proceedings of the DAGA - Deutsche Jahrestagung für Akustik 2019, Rostock Ed. Deutsche Gesellschaft für Akustik - DEGA, 2019. 1410-1413.

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