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Numerical and Experimental Assessment of Parameters Influencing the Development of Secondary Vortex Structures in Rotor Wakes

Bodling, Andrew und Schwarz, Clemens und Wolf, Christian und Gardner, Anthony (2023) Numerical and Experimental Assessment of Parameters Influencing the Development of Secondary Vortex Structures in Rotor Wakes. In: 79th Vertical Flight Society Annual Forum and Technology Display, FORUM 2023, Seiten 1-17. Vertical Flight Society. VFS International 79th Annual Forum & Technology Display, 2023-05-16 - 2023-05-18, West Palm Beach, FL, USA. doi: 10.4050/F-0079-2023-17995. ISBN 978-171387479-9.

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Kurzfassung

A common phenomenon in modern high-fidelity CFD simulations is the breakdown of the primary vortex system in hover due to secondary vortex braids. In the current work, the development of secondary vortex structures in the wake of a two-bladed rotor was investigated by combining stereoscopic particle image velocimetry measurements in different measurement planes and high-fidelity simulations. An analysis was performed to investigate how various numerical inputs including sub-iteration convergence, numerical dissipation, blade pitch offset, grid-resolution, and rotor thrust affect the primary and secondary vortex characteristics. A parametric study on near- and off-body solver sub-iteration convergence demonstrated that the primary and secondary vortex characteristics converge as the sub-iteration convergence of both solvers increase. The breakdown of the primary vortex was shown to be directly linked to the number of secondary vortices. Dissimilarities in the blade pitch angle, which could not be avoided in the experiment, were modeled by intentionally using an offset in the blade pitch angle of the two blades. It was shown that as blade pitch angle offset increases, vortex pairing becomes more distinct. When vortex pairing occurred in both the experiment and simulation, the decay of secondary vortices in the experiment and simulation agreed best. Grid resolution was decreased from 5% chord to 3% chord, and the finer mesh simulation with higher sub-iteration conver gence agreed best with the measured primary and secondary vortex characteristics. Differences in the measured and predicted number of secondary vortices for the lower thrust case was attributed to differences in tip vortex breakdown in the experiment and simulation.

elib-URL des Eintrags:https://elib.dlr.de/197082/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Numerical and Experimental Assessment of Parameters Influencing the Development of Secondary Vortex Structures in Rotor Wakes
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Bodling, AndrewScience and Technology CorporationNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schwarz, ClemensClemens.Schwarz (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wolf, ChristianChristian.Wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548NICHT SPEZIFIZIERT
Gardner, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447147332664
Datum:18 Mai 2023
Erschienen in:79th Vertical Flight Society Annual Forum and Technology Display, FORUM 2023
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.4050/F-0079-2023-17995
Seitenbereich:Seiten 1-17
Verlag:Vertical Flight Society
ISBN:978-171387479-9
Status:veröffentlicht
Stichwörter:rotor aerodynamics, tip vortex, vortex decay
Veranstaltungstitel:VFS International 79th Annual Forum & Technology Display
Veranstaltungsort:West Palm Beach, FL, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:16 Mai 2023
Veranstaltungsende:18 Mai 2023
Veranstalter :Vertical Flight Society
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: Koch, Bianca
Hinterlegt am:24 Nov 2023 10:08
Letzte Änderung:24 Apr 2024 20:57

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