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Investigating Noise Shielding by Unconventional Aircraft Configurations

Rossignol, Karl-Stéphane and Pott-Pollenske, Michael and Delfs, Jan Werner and Silberman, Jakob and Gomes, Jorge (2017) Investigating Noise Shielding by Unconventional Aircraft Configurations. 23rd AIAA/CEAS Aeroacoustics Conference, Denver. doi: 10.2514/6.2017-3195.

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First experimental results on investigations of the shielding characteristics of three unconventional aircraft configurations are presented. DLR's Low Noise Aircraft, a scaled-down version of NASA's Hybrid Wing Body configuration and DLR's F17E Unmanned Combat Air Vehicle configuration are all investigated in the acoustic plenum of the DNW-NWB wind tunnel at DLR in Braunschweig. Using a laser-based non- intrusive impulsive point source, various effective engine placements were investigated for selected model settings. Shielding factors are calculated from in-flow measurements made over a large spatial extent in the fly-over plane. For the present application of the laser-based point source, a custom optical setup was developed to achieve a focal length large enough for its use in the DNW-NWB. In this report emphasis is, therefore, put on a presentation of the optical design and on the characterization of the resulting sound surce. The shielding results presented herein provide a first look into the acquired database. Future work will be focussed on a finer analysis of the acquired database as well as on the realization of companion numerical simulations aimed at the validation of in-house simulation tools. The work presented herein will also serve as a basis for the elaboration of guidelines for the design of low-noise UCAV configurations.

Item URL in elib:https://elib.dlr.de/117125/
Document Type:Conference or Workshop Item (Speech)
Title:Investigating Noise Shielding by Unconventional Aircraft Configurations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rossignol, Karl-Stéphanekarl-stephane.rossignol (at) dlr.deUNSPECIFIED
Pott-Pollenske, Michaelmichael.pott-pollenske (at) dlr.deUNSPECIFIED
Delfs, Jan Wernerjan.delfs (at) dlr.deUNSPECIFIED
Silberman, JakobBernhard Halle NachfolgerUNSPECIFIED
Gomes, JorgeDNW, NetherlandsUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.2514/6.2017-3195
Keywords:Aeroacoustics,Hybrid Wing Body, Shielding, Noise,Experiment, Wind tunnel
Event Title:23rd AIAA/CEAS Aeroacoustics Conference
Event Location:Denver
Event Type:international Conference
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 (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
German-Dutch Windtunnels
Deposited By: Rossignol, Karl-Stephane
Deposited On:19 Dec 2017 08:54
Last Modified:19 Dec 2017 08:54

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