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Active Control of Fan Tones by Means of Wake Filling: Variation of Partial Edge Blowing

Enghardt, L. and Moreau, Antoine and Koschel, St. and Oertwig, S. and Tapken, U. (2018) Active Control of Fan Tones by Means of Wake Filling: Variation of Partial Edge Blowing. In: 24th AIAA/CEAS Aeroacoustics Conference, 2018. AIAA/CEAS Aeroacoustics Conference, Atlanta, Georgia, USA. DOI: 10.2514/6.2018-4193 ISBN 978-162410560-9

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Abstract

Trailing Edge Blowing (TEB) injects air into the wake flow of the rotor blades to reduce the pressure and force fluctutations, which are responsible for the excitation of RSI noise. Previous Research has shown that in particular when trying to perfectly fill the Wakes by blowing out air along the full blade span the Approach was surprisingly disadvantageous in Terms of tonal noise reduction. In order to get more insight into the generation of the Sound sources, the present work focuses on the influence of the radial Position of TEB on the RSI tones by partly blocking the series of finve internral blade channels for all blades, causing circumferentially symmetrical blowing patterns with differing radial structures. A large variety of configurations and operating conditions were investigated by means of in-duct microphones as well as with hot-wire measurements in the inter-stage Region of the fan rig. The experimental setup is presented and Chosen acoustic results in the inlet are analysed as a function of different blowing configurations, Parameters, and operating conditions. A theoretical study on two chosed parmater sets of TEB reveals surprising similarities in their acoustics Performance, whereas the radial blowing patterns differ substantially

Item URL in elib:https://elib.dlr.de/126518/
Document Type:Conference or Workshop Item (Speech)
Title:Active Control of Fan Tones by Means of Wake Filling: Variation of Partial Edge Blowing
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Enghardt, L.DLR AT-TRAUNSPECIFIED
Moreau, AntoineDLR AT-TRAUNSPECIFIED
Koschel, St.DLR AT-TRAUNSPECIFIED
Oertwig, S.DLR AT-TRAUNSPECIFIED
Tapken, U.DLR AT-TRAUNSPECIFIED
Date:2018
Journal or Publication Title:24th AIAA/CEAS Aeroacoustics Conference, 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI :10.2514/6.2018-4193
ISBN:978-162410560-9
Status:Published
Keywords:Trailing Edge Blowing, rotor blades, Active control of Fan Tones
Event Title:AIAA/CEAS Aeroacoustics Conference
Event Location:Atlanta, Georgia, USA
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Enghardt, Lars
Deposited On:14 Feb 2019 14:31
Last Modified:14 Feb 2019 14:31

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