Schwarz, Clemens und Bodling, Andrew und Wolf, Christian und Brinkema, Robert und Potsdam, Mark und Gardner, Anthony (2022) Development of secondary vortex structures in rotor wakes. Experiments in Fluids, 63 (4), Seiten 1-21. Springer Nature. doi: 10.1007/s00348-021-03348-8. ISSN 0723-4864.
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Offizielle URL: https://link.springer.com/article/10.1007/s00348-021-03348-8
Kurzfassung
The blade tip vortex system is a crucial feature in the wake of helicopter rotors, and its correct prediction represents a major challenge in the numerical simulation of rotor flows. A common phenomenon in modern high-fidelity CFD simulations is the breakdown of the primary vortex system in hover due to secondary vortex braids. Since they are strongly influenced by the numerical settings, the degree to which these secondary vortex structures actually physically occur is still discussed and needs experimental validation. In the current work, the development of secondary vortex structures in the wake of a two-bladed rotor in hover conditions was investigated by combining stereoscopic particle image velocimetry measurements in different measurement planes and high-fidelity simulations. Secondary vortex structures were detected and quantified at different axial locations in the wake by applying an identical scheme to the measured and simulated velocity data. In agreement, it was found that the number of secondary vortices is maximum at a distance of 0.8R below the rotor. The more intense secondary vortex structures were quantitatively well captured in the simulation, whereas in the experiment a larger number of weaker vortices were detected. No distinct preferential direction of rotation was found for the secondary vortices, but they tended to develop in vortex pairs with alternating sense of rotation. A clustered occurrence of secondary vortices was observed close to the primary tip vortices, where the rolled-up blade shear layer breaks down into coherent vortex structures.
elib-URL des Eintrags: | https://elib.dlr.de/191161/ | ||||||||||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||||||
Zusätzliche Informationen: | Published Online: December 2021 Citation: print version 2022 | ||||||||||||||||||||||||||||
Titel: | Development of secondary vortex structures in rotor wakes | ||||||||||||||||||||||||||||
Autoren: |
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Datum: | Januar 2022 | ||||||||||||||||||||||||||||
Erschienen in: | Experiments in Fluids | ||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||||||
Band: | 63 | ||||||||||||||||||||||||||||
DOI: | 10.1007/s00348-021-03348-8 | ||||||||||||||||||||||||||||
Seitenbereich: | Seiten 1-21 | ||||||||||||||||||||||||||||
Herausgeber: |
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Verlag: | Springer Nature | ||||||||||||||||||||||||||||
ISSN: | 0723-4864 | ||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||
Stichwörter: | rotor wake, secondary vortices, PIV, CFD | ||||||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||||||||||||||
HGF - Programmthema: | Effizientes Luftfahrzeug | ||||||||||||||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | L EV - Effizientes Luftfahrzeug | ||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Virtueller Hubschrauber und Validierung | ||||||||||||||||||||||||||||
Standort: | Göttingen | ||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Hubschrauber, GO | ||||||||||||||||||||||||||||
Hinterlegt von: | Carter, Beatrice | ||||||||||||||||||||||||||||
Hinterlegt am: | 06 Dez 2022 11:26 | ||||||||||||||||||||||||||||
Letzte Änderung: | 27 Jun 2023 15:05 |
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