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Dynamic Stall Experiments on a Rotor with High Cyclic Setting in Axial Inflow

Schwermer, Till und Gardner, Anthony und Raffel, Markus (2017) Dynamic Stall Experiments on a Rotor with High Cyclic Setting in Axial Inflow. American Helicopter Society (AHS): 73rd Annual Forum &Technology Display, 2017-05-09 - 2017-05-11, Fort Worth, Texas, USA.

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Offizielle URL: https://vtol.org/annual-forum/forum-73

Kurzfassung

Dynamic stall is one of the limiting aerodynamic phenomena that occur on modern helicopter rotors during fast forward and maneuvering flight conditions. During dynamic stall the effective angle of attack on the retreating side of the rotor exceeds the static stall angle and a lift peak as well as a negative peak in the pitching moment are observed. These loads can be crucial regarding the blades and the pitch links structural integrity and therefore limit the flight envelope of modern helicopters. Separated flows, especially in a rotating frame, are strongly three-dimensional, which is neglected when examining two-dimensional pitching airfoils where the flow is assumed to be two-dimensional in the mid-section of the model. Therefore experiments are conducted on model rotors, e.g. in hover chambers. Two major disadvantages apply to most (small) hover chambers: usually the rotor is operated in ground effect and the rotor inflow is disturbed due to recirculation of the rotor wake. The closest representation of the flow around a full-scale helicopter is achieved in experiments conducted in wind tunnels where it is possible to achieve fast forward flight conditions. However these are often very complex and expensive. During the design phase of the rotor test facility (RTG) at the DLR in Göttingen, three major aspects were considered: avoidance of an operation in ground effect, supply of a defined rotor inflow with prevention of a rotor wake recirculation and construction of an easy to use facility with good optical access to the rotor. These aspects resulted in the design…

elib-URL des Eintrags:https://elib.dlr.de/106086/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Dynamic Stall Experiments on a Rotor with High Cyclic Setting in Axial Inflow
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schwermer, Tilltill.schwermer (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Gardner, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447NICHT SPEZIFIZIERT
Raffel, Markusmarkus.raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115NICHT SPEZIFIZIERT
Datum:2017
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Dynamic Stall, Aerodynamics, PIV, Rotor Test Facility, RTG, Helicopters
Veranstaltungstitel:American Helicopter Society (AHS): 73rd Annual Forum &Technology Display
Veranstaltungsort:Fort Worth, Texas, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:9 Mai 2017
Veranstaltungsende:11 Mai 2017
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
Hinterlegt von: Winkels, Elisabeth
Hinterlegt am:13 Dez 2017 14:31
Letzte Änderung:24 Apr 2024 20:11

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