Comparison of slit tube probe and multi-port method for the acoustical characterisation of ducted axial fans

Riedel J, Heinemann C, Becker S (2023)

Publication Type: Conference contribution

Publication year: 2023

Publisher: European Acoustics Association, EAA

Conference Proceedings Title: Proceedings of Forum Acusticum

Event location: Torino IT

ISBN: 9788888942674

Abstract

In industrial applications, axial-fans are often not used as free air-intake and exhaust units, but are integrated into a duct system, especially for building ventilation. On the one hand, the installation of the fan in a duct system shifts the operating point of the fan on the characteristic curve; on the other hand, the sound spectrum emitted by the fan is also influenced. Classically, the acoustical characterisation of axial-fans in duct flows is carried out with the slit-tube-probe. On the one hand, this method does not allow the emitted sound spectrum to be decomposed according to acoustic modes, and on the other hand, it can only suppress hydrodynamic pressure fluctuations, which mask the useful signal, to a limited extent. With the so-called multi-port-method, the sound field can be decomposed into the individual duct modes by using several microphones mounted flush with the wall upstream and downstream of the fan. In this contribution, the advantages and disadvantages of the two measurement methods shall be elaborated using the example of a medium-pressure axial-fan integrated in a duct test-rig. The primary objective of this work is to derive measures for noise reduction of the overall system consisting of axial-fan and duct.

Authors with CRIS profile

Jörg Riedel Lehrstuhl für Strömungsmechanik (LSTM) Stefan Becker Lehrstuhl für Strömungsmechanik (LSTM)

How to cite

APA:

Riedel, J., Heinemann, C., & Becker, S. (2023). Comparison of slit tube probe and multi-port method for the acoustical characterisation of ducted axial fans. In Proceedings of Forum Acusticum. Torino, IT: European Acoustics Association, EAA.

MLA:

Riedel, Jörg, Constantin Heinemann, and Stefan Becker. "Comparison of slit tube probe and multi-port method for the acoustical characterisation of ducted axial fans." Proceedings of the 10th Convention of the European Acoustics Association, EAA 2023, Torino European Acoustics Association, EAA, 2023.

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