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On the Influence of Trailing-Edge Serrations on Open-Rotor Tonal Noise

Weckmüller, Ch. and Guerin, S. (2012) On the Influence of Trailing-Edge Serrations on Open-Rotor Tonal Noise. In: Proceedings 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference), Vol 1 of 5. 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference), 04.06. - 06.06.2012, Colorado Springs, Colorado, USA. ISBN 978-1-62276-215-6

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Abstract

Tonal noise of contra-rotating open rotors can be divided into self and interaction noise. The latter can be subdivided into potential field interaction noise, noise due to the interaction of the front-rotor wakes with the aft-rotor blades and tip vortex interaction noise. The excited tonal sound field is closely related to the properties of the impinging wakes provided that the tip vortex interaction is not the dominant source of interaction noise. Designing the trailing edge of the front-rotor blades with serrations will enhance the mixing in the wakes which should have a beneficial effect on the interaction tones. This process is investigated with 3D RANS calculations of 3 serration designs. Through assessment of the wake properties one configuration is down selected for evaluation of the far-field sound levels. These are computed using a 3D URANS approach coupled to an integral method that implements the FW-H acoustic analogy. The effect observed with the serrations on the far-field directivity is twofold: at low frequencies the sound energy is redistributed in the polar arc; at higher frequencies a systematic reduction of the sound emission is observed.

Item URL in elib:https://elib.dlr.de/80469/
Document Type:Conference or Workshop Item (Speech)
Title:On the Influence of Trailing-Edge Serrations on Open-Rotor Tonal Noise
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Weckmüller, Ch.UNSPECIFIEDUNSPECIFIED
Guerin, S.UNSPECIFIEDUNSPECIFIED
Date:2012
Journal or Publication Title:Proceedings 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:Vol 1 of 5
ISBN:978-1-62276-215-6
Status:Published
Keywords:Tonal noise, CROR, open rotor, serration, URANS
Event Title:18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference)
Event Location:Colorado Springs, Colorado, USA
Event Type:international Conference
Event Dates:04.06. - 06.06.2012
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Kaur, Balbir
Deposited On:10 Jan 2013 12:30
Last Modified:10 Jan 2013 12:30

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