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BOS and Hot-Film Analysis of a CH-53G Helicopter Wake in Ground Effect

Braukmann, Johannes N. and Schwarz, Clemens and Wolf, Christian and Buron, Elizabeth and Koch, Stefan and Buske, Gerrit and Gardner, Anthony (2023) BOS and Hot-Film Analysis of a CH-53G Helicopter Wake in Ground Effect. In: 79th Vertical Flight Society Annual Forum and Technology Display, FORUM 2023, pp. 1-15. Vertical Flight Society. Vertical Flight Society Forum 79 2023, 2023-05-16 - 2023-05-18, West Palm Beach, Florida, USA.

Full text not available from this repository.

Official URL: https://vtol.org/annual-forum/forum-79-proceedings?paperSort=title

Abstract

Constant temperature anemometry and background-oriented schlieren (BOS) measurements on a CH-53G helicopter (take off mass x 14t) are used to investigate the rotor wake including the vortex breakdown to statistical turbulence. Hovering flights at a range of hub heights O.50 < h < 0.83 were investigated. The position of the rotorcraft was optically tracked using markers affixed to the fuselage. A complete breakdown of the tip vortices was noted within 0.3fl of the rotor plane, in stark qualitative contrast to small scale experiments wich show the tip vortices persisting to the ground plane. The large (37m2) BOS field of view showed a small effect of vortex pairing and blade vortex interaction, which was overshadowed by the rapid wake breakdown. Vortex pairing was found to result from varying vortex convection velocities rather than from differences in the vortex spacing due to the blade track.

Item URL in elib:https://elib.dlr.de/196402/
Document Type:Conference or Workshop Item (Speech)
Title:BOS and Hot-Film Analysis of a CH-53G Helicopter Wake in Ground Effect
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Braukmann, Johannes N.UNSPECIFIEDhttps://orcid.org/0000-0001-8046-9623UNSPECIFIED
Schwarz, ClemensUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wolf, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-9052-7548UNSPECIFIED
Buron, ElizabethUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Koch, StefanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Buske, GerritGerman Armed ForcesUNSPECIFIEDUNSPECIFIED
Gardner, AnthonyUNSPECIFIEDhttps://orcid.org/0000-0002-1176-3447140558356
Date:18 May 2023
Journal or Publication Title:79th Vertical Flight Society Annual Forum and Technology Display, FORUM 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-15
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
UNSPECIFIEDVertical Flight SocietyUNSPECIFIEDUNSPECIFIED
Publisher:Vertical Flight Society
Status:Published
Keywords:BOS, turbulence, ground effect, helicopter wake, vortex decay
Event Title:Vertical Flight Society Forum 79 2023
Event Location:West Palm Beach, Florida, USA
Event Type:international Conference
Event Start Date:16 May 2023
Event End Date:18 May 2023
Organizer:Vertical Flight Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Rotorcraft and Validation
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Flugexperimente > Projektmanagement Flugexperimente BS
Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Koch, Bianca
Deposited On:16 Aug 2023 14:35
Last Modified:24 Apr 2024 20:56

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