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Main Title: Active control of the aerodynamic performance and tonal noise of axial turbomachines
Author(s): Neuhaus, L.
Schulz, J.
Neise, W.
Möser, M.
Type: Article
Language Code: en
Abstract: Two projects on axial fans are presented in this paper. The first aims at improving the aerodynamic performance and reducing the tip clearance noise caused by the rotating instability. This is achieved by injecting air into the radial gap between the impeller blade tips and the fan casing. Steady air injection with small mass flows results in remarkable reductions in the noise level along with improved aerodynamic performance. Larger injected mass flows give significant improvements in the aerodynamic performance at the expense of an increased overall noise level. The second project uses flow control actively to reduce the blade passage frequency (BPF) level. Experimental results are presented for steady jets injected into the main flow and cylindrical rods at axial positions downstream of the impeller blades. The method is successful for higher-order mode sound fields where the BPF level is reduced by up to 20.5 dB.
Issue Date: 2003
Date Available: 8-Jan-2019
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): active noise control
active flow control
rotating instability
tip clearance noise
axial fan
fan noise
axial turbomachine
tonal noise components
vortex generator jets
air injection
Sponsor/Funder: DFB, SFB 557, Beeinflussung komplexer turbulenter Scherströmungen
Journal Title: Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
Publisher: SAGE Publications
Publisher Place: Washington, DC
Volume: 217
Issue: 4
Publisher DOI: 10.1243/095765003322315432
Page Start: 375
Page End: 383
EISSN: 2041-2967
ISSN: 0957-6509
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:FG Experimentelle Strömungsmechanik » Publications

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