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Active Flow Control for Interaction Noise Reduction of Contra-Rotating Open Rotors

Akkermans, R.A.D. and Stürmer, Arne and Delfs, J.W. (2016) Active Flow Control for Interaction Noise Reduction of Contra-Rotating Open Rotors. AIAA Journal, 54 (4), pp. 1413-1423. American Institute of Aeronautics and Astronautics (AIAA). ISSN 0001-1452

Full text not available from this repository.

Official URL: http://dx.doi.org/10.2514/1.J053756

Abstract

A possible way to decrease interaction tone noise of a contra-rotating open rotor is through the application of trailing-edge blowing by reducing the momentum deficit of the front rotor wake, and therefore its interaction with the aft rotor. In this contribution, an assessment of front-rotor trailing-edge blowing is presented for the reduction of contra-rotating open-rotor interaction noise. For this purpose, the German Aerospace Center designed a generic contra-rotating open rotor that has been modified to include trailing-edge blowing at the front rotor blades. With the German Aerospace Center computational fluid dynamics code TAU, unsteady Reynolds-averaged Navier–Stokes simulations have been made of the baseline and the trailing-edge blowing configuration. Subsequently, an aeroacoustic analysis has been performed with the Ffowcs-Williams/Hawkings tool APSIM+ for both configurations. The results show negligible differences of the aerodynamic performance, with significantly lower unsteady loading of the aft rotor when the trailing-edge blowing technique is active. The aeroacoustic results illustrate that the interaction tones are notably ameliorated; that is, a reduction over almost the complete polar angle is seen when trailing-edge blowing is active. With respect to the A-weighted overall sound pressure level, a reduction of approximately 2.5 dBA in the maximum level for the trailing-edge blowing configuration is achieved for the considered geometry. Noise reductions up to 5 dBA are displayed in the up- and downstream directions, which mainly arise from reduced interaction tones caused by the trailing-edge blowing technique. The decreased noise radiation with trailing-edge blowing mainly stems from a reduction in the first two interaction tones.

Item URL in elib:https://elib.dlr.de/109173/
Document Type:Article
Title:Active Flow Control for Interaction Noise Reduction of Contra-Rotating Open Rotors
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Akkermans, R.A.D.rinie.akkermans (at) dlr.deUNSPECIFIED
Stürmer, Arnearne.stuermer (at) dlr.deUNSPECIFIED
Delfs, J.W.jan.delfs (at) dlr.deUNSPECIFIED
Date:5 January 2016
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:54
Page Range:pp. 1413-1423
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Published
Keywords:CROR, uRANS, CFD, CAA, aerodynamics, aeroacoustics, active flow control
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Transport Aircraft
Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Stürmer, Arne
Deposited On:08 Dec 2016 15:03
Last Modified:08 Mar 2018 18:42

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