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Experimental Study of Secondary Vortex Structures in a Rotor Wake

Wolf, C. Christian and Schwarz, Clemens and Kaufmann, Kurt and Gardner, Anthony D. and Michaelis, Dirk and Bosbach, Johannes and Schanz, Daniel and Schröder, Andreas (2019) Experimental Study of Secondary Vortex Structures in a Rotor Wake. Experiments in Fluids, 60 (11), pp. 1-16. Springer. DOI: 10.1007/s00348-019-2807-1 ISSN 0723-4864

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Official URL: https://link.springer.com/article/10.1007/s00348-019-2807-1

Abstract

The operation and aerodynamic performance of a helicopter rotor is strongly affected by the structure of its wake, in particular regarding vortex-vortex interactions of hovering rotors. Rotor simulations using modern computational methods have the potential to capture high levels of detail, which recently triggered discussions of secondary vortex braids entangling the primary tip vortices. These structures are highly dependent on the numerical settings and need experimental validation. The current work investigates the wake of a subscale rotor in ground effect by time-resolved and volumetric flow-field measurements using the "Shake-The-Box" technique. Both the Lagrangian tracks of the flow tracers and the derived gradient-based vortex criteria clearly verify the existence of secondary vortices. A post-processing scheme is applied to isolate these vortices in larger data sets. No distinct spatial organization of the structures was observed, but a slightly preferred sense of rotation which agrees to the shear of the wake swirl. The secondary structures were created shortly downstream of the rotor blades, starting at wake ages of approximately 75 degree.

Item URL in elib:https://elib.dlr.de/128526/
Document Type:Article
Title:Experimental Study of Secondary Vortex Structures in a Rotor Wake
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wolf, C. ChristianChristian.Wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Schwarz, ClemensClemens.Schwarz (at) dlr.deUNSPECIFIED
Kaufmann, KurtKurt.Kaufmann (at) dlr.dehttps://orcid.org/0000-0003-2276-3386
Gardner, Anthony D.anthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Michaelis, DirkLaVision GmbH, Göttingen, GermanyUNSPECIFIED
Bosbach, JohannesJohannes.Bosbach (at) dlr.dehttps://orcid.org/0000-0002-1531-127X
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Schröder, AndreasAndreas.Schroeder (at) dlr.deUNSPECIFIED
Date:November 2019
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:60
DOI :10.1007/s00348-019-2807-1
Page Range:pp. 1-16
Editors:
EditorsEmail
UNSPECIFIEDSpringer-Verlag GmbH Germany
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:Shake the box, volumetric flow measurement, rotor wake
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
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Winkels, Elisabeth
Deposited On:07 Nov 2019 11:48
Last Modified:11 Dec 2019 13:14

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