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Towards Tip Vortex Measurements on Rotors in the High Pressure Wind Tunnel Göttingen (HDG) of the DLR

Bartzsch, Hauke Till and Wolf, C. Christian and Gardner, Anthony and Braune, Marc and Löhr, Markus (2023) Towards Tip Vortex Measurements on Rotors in the High Pressure Wind Tunnel Göttingen (HDG) of the DLR. In: 21. STAB-Workshop - Jahresbericht 2023, pp. 48-49. 21. STAB - Workshop 2023, 2023-11-07 - 2023-11-08, Göttingen, Deutschland.

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Official URL: https://www.dlr.de/as/Portaldata/5/Resources/dokumente/veranstaltungen/stab_workshop/Jahresbericht2023.pdf


The wake of a helicopter rotor features vortices originating from the blade tips. The vortices are relevant for the rotor noise and rotor performance, hence, the analysis of their propagation, growth and decay is of particular interest. It is widely believed that the vortex Reynolds number, defined as the ratio of the vortex circulation to the fluid viscosity, is an important factor in this process. Being related to turbulence and instability mechanisms, the Reynolds number effect on the vortex evolution is difficult to capture in numerical simulations. Therefore, experiments with a variation of the Reynolds number are required. Atmospheric subscale test facilities cannot reproduce the Reynolds numbers encountered on full-size helicopter rotors due to size limitations, whereas field measurements on free-flying helicopters are affected by the engine exhaust flow, wind gusts, blockage of the fuselage, tail rotor, etc. Furthermore, neither approach enables a variation of the Reynolds number independently of the rotational speed and the rotor dimensions. Therefore, we chose DLR’s High Pressure Wind Tunnel Göttingen (HDG) for measurements with a varying Reynolds number. The current work discusses the experimental methodology and sample results from a pretest.

Item URL in elib:https://elib.dlr.de/199219/
Document Type:Conference or Workshop Item (Speech)
Title:Towards Tip Vortex Measurements on Rotors in the High Pressure Wind Tunnel Göttingen (HDG) of the DLR
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wolf, C. ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-9052-7548UNSPECIFIED
Gardner, AnthonyUNSPECIFIEDhttps://orcid.org/0000-0002-1176-3447148183834
Date:7 November 2023
Journal or Publication Title:21. STAB-Workshop - Jahresbericht 2023
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 48-49
EditorsEmailEditor's ORCID iDORCID Put Code
Series Name:Jahresbericht
Keywords:aerodynamics, helicopter, helicopter wake, BOS, vortex decay, Reynolds number, wind tunnel, vortex interaction, hover
Event Title:21. STAB - Workshop 2023
Event Location:Göttingen, Deutschland
Event Type:Workshop
Event Start Date:7 November 2023
Event End Date:8 November 2023
Organizer:DLR, STAB
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: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Koch, Bianca
Deposited On:06 Dec 2023 14:16
Last Modified:24 Apr 2024 20:59

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