Wolf, C. Christian und Schwarz, Clemens und Kaufmann, Kurt und Gardner, Anthony D. und Michaelis, Dirk und Bosbach, Johannes und Schanz, Daniel und Schröder, Andreas (2019) Experimental Study of Secondary Vortex Structures in a Rotor Wake. Experiments in Fluids, 60 (11), Seiten 1-16. Springer Nature. doi: 10.1007/s00348-019-2807-1. ISSN 0723-4864.
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Offizielle URL: https://link.springer.com/article/10.1007/s00348-019-2807-1
Kurzfassung
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.
elib-URL des Eintrags: | https://elib.dlr.de/128526/ | ||||||||||||||||||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||||||||||||||
Titel: | Experimental Study of Secondary Vortex Structures in a Rotor Wake | ||||||||||||||||||||||||||||||||||||
Autoren: |
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Datum: | November 2019 | ||||||||||||||||||||||||||||||||||||
Erschienen in: | Experiments in Fluids | ||||||||||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||||||||||||||
Band: | 60 | ||||||||||||||||||||||||||||||||||||
DOI: | 10.1007/s00348-019-2807-1 | ||||||||||||||||||||||||||||||||||||
Seitenbereich: | Seiten 1-16 | ||||||||||||||||||||||||||||||||||||
Herausgeber: |
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Verlag: | Springer Nature | ||||||||||||||||||||||||||||||||||||
ISSN: | 0723-4864 | ||||||||||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||||||||||
Stichwörter: | Shake the box, volumetric flow measurement, rotor wake | ||||||||||||||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||||||||||||||||||||||
HGF - Programmthema: | Hubschrauber | ||||||||||||||||||||||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | L RR - Rotorcraft Research | ||||||||||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Der virtuelle Drehflügler (alt) | ||||||||||||||||||||||||||||||||||||
Standort: | Göttingen | ||||||||||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Hubschrauber, GO Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren, GO | ||||||||||||||||||||||||||||||||||||
Hinterlegt von: | Winkels, Elisabeth | ||||||||||||||||||||||||||||||||||||
Hinterlegt am: | 07 Nov 2019 11:48 | ||||||||||||||||||||||||||||||||||||
Letzte Änderung: | 31 Okt 2023 13:35 |
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