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Parametric Study of the Noise Emitted by Uncorrelated, Distributed, Electric Fans

Guerin, Sebastien and Moreau, Antoine and Meier zu Ummeln, Robert and Staggat, Martin (2021) Parametric Study of the Noise Emitted by Uncorrelated, Distributed, Electric Fans. 2021 AIAA AVIATION Forum, 2.-6. Aug. 2021, Virtual Event. doi: 10.2514/6.2021-2137.

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The development of new technologies does not prevent from considering the natural effects such as the hearing sensitivity and the sound absorption by the atmosphere as possible solutions to reduce aircraft noise and its perception. In this study, the noise emitted by distributed, electric, shrouded fans is predicted by means of semi-analytical models. The impact due to a variation of the propulsor number from 2 to 30 is quantified for a short-to-medium range airplane similar to an Airbus A320. The propulsors are assumed not to interact with each other. The investigation is conducted for nine different fans having a pressure ratio ranging from 1.47 to 1.28 at the design point. The propulsive architecture is not modelled in detail but the impact of engine size and weight on drag are considered. The acoustic assessment is based on two noise metrics standing for loudness and annoyance. The results indicate that multiplying the number of propulsors--each fan becomes smaller and rotates faster--can help reduce the noise perceived by a far-field observer. Two conditions regarding the peak of noise are then required: i) it should occur at sufficiently high frequency to benefit of the absorption mechanism by the atmosphere and ii) it should be outside the range of maximal hearing sensitivity. One remarkable result shows that a design modification, which is effective in reducing the noise emitted by the fans in a conventional configuration with two engines, loses its benefit when the engines are downscaled for the purpose of distribution.

Item URL in elib:https://elib.dlr.de/147063/
Document Type:Conference or Workshop Item (Speech)
Title:Parametric Study of the Noise Emitted by Uncorrelated, Distributed, Electric Fans
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Guerin, SebastienSebastien.Guerin (at) dlr.deUNSPECIFIED
Moreau, Antoineantoine.moreau (at) dlr.deUNSPECIFIED
Meier zu Ummeln, RobertRobert.MeierzuUmmeln (at) dlr.deUNSPECIFIED
Staggat, Martinmartin.staggat (at) dlr.deUNSPECIFIED
Date:August 2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.2514/6.2021-2137
Keywords:acoustics, fan noise, distributed electric propulsion
Event Title:2021 AIAA AVIATION Forum
Event Location:Virtual Event
Event Type:international Conference
Event Dates:2.-6. Aug. 2021
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Virtual Engine
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Guerin, Sebastien
Deposited On:13 Dec 2021 16:31
Last Modified:13 Dec 2021 16:31

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