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Wind-Tunnel Study of a Wing-Embedded Lifting Fan Remaining Open in Cruise Flight

Hoeveler, Bastian and Bauknecht, Andre and Wolf, Christian and Janser, Frank (2020) Wind-Tunnel Study of a Wing-Embedded Lifting Fan Remaining Open in Cruise Flight. Journal of Aircraft, 57 (4), pp. 558-568. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.C035422. ISSN 0021-8669.

Full text not available from this repository.

Official URL: https://doi.org/10.2514/1.C035422


It is investigated whether a nonrotating lifting fan remaining uncovered during cruise flight, as opposed to being covered by a shutter system, can be realized with limited additional drag and loss of lift during cruise flight. A wind tunnel study of a wing-embedded lifting fan has been conducted at the Side Wind Test Facility Göttingen of DLR, German Aerospace Center in Göttingen using force, pressure, and stereoscopic particle image velocimetry techniques. The study showed that a step on the lower side of the wing in front of the lifting fan duct increases the lift to-drag ratio of the whole model byup to 25%for allpositive angles of attack. Different sizes and inclinations ofthe step had limited influence on the surface pressure distribution. The data indicate that these parameters can be optimized to maximize the lift-to-drag ratio. A doubling of the curvature radius of the lifting fan duct inlet lip on the upper side of the wing affected the lift-to-drag ratio by less than 1%. The lifting fan duct inlet curvature can therefore be optimized to maximize the vertical fan thrust of the rotating lifting fan during hovering without affecting the cruise flight performance with a nonrotating fan.

Item URL in elib:https://elib.dlr.de/135949/
Document Type:Article
Additional Information:Print: 0021-8669 Electronic: 1533-3868
Title:Wind-Tunnel Study of a Wing-Embedded Lifting Fan Remaining Open in Cruise Flight
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bauknecht, AndreUniversity of Marylandhttps://orcid.org/0000-0002-4076-780XUNSPECIFIED
Wolf, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-9052-7548UNSPECIFIED
Date:July 2020
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 558-568
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:helicopter, lifting fan duct, wind tunnel measurements, PIV
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Carter, Beatrice
Deposited On:09 Sep 2020 22:28
Last Modified:09 Sep 2020 22:28

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