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BOS-based three-dimensional reconstruction of rotor blade tip vortices

Debernardis, Nicola (2020) BOS-based three-dimensional reconstruction of rotor blade tip vortices. Masterarbeit, Politecnico di Malano.

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Offizielle URL: https://www.politesi.polimi.it/handle/10589/153023

Kurzfassung

A research topic of the Institute of Aerodynamics and Flow Technology in Göttingen is the investigation of blade tip vortices created by helicopter rotors. These vortices are investigated both on free-flying helicopters in different flight situations and on a rotor test stand. A measurement technique that is used to visualize these vortices is the density based background-oriented schlieren (BOS) method. The subject of this work is the three-dimensional vortex reconstruction based on stereoscopic BOS measurements. Therefore, a reconstruction scheme based on epipolar geometry was developed and applied to vortex filaments that were recorded in two different experiments. First, a model helicopter in free flight was investigated and it was possible to reconstruct significant parts of the vortex system up to a maximum vortex age Ψv above 600° during an unsteady takeoff maneuver in ground effect. The developed evaluation scheme was subsequently adapted and applied to the vortex system generated by a rotor test stand with cyclic pitch control. Vortex filaments of the rotor in cyclic pitch conditions were reconstructed and the vortex convection was investigated. The evaluation of a larger sample number of 200 measurement images in quasi-steady conditions showed a significant scatter in the vortex locations, which is in agreement with previous findings. The developed reconstruction scheme allows an automated extraction of vortex positions for a multitude of test conditions at the rotor test stand for future investigations.

elib-URL des Eintrags:https://elib.dlr.de/135806/
Dokumentart:Hochschulschrift (Masterarbeit)
Titel:BOS-based three-dimensional reconstruction of rotor blade tip vortices
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Debernardis, NicolaPolitecnico di MalanoNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:29 April 2020
Referierte Publikation:Ja
Open Access:Nein
Status:veröffentlicht
Stichwörter:3D reconstruction, epipolar geometry, BOS
Institution:Politecnico di Malano
Abteilung:Dipartimento di Scienze e Tecnologie Aerospaziali
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: Carter, Beatrice
Hinterlegt am:08 Sep 2020 10:02
Letzte Änderung:14 Jun 2022 12:10

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