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Blade Tip Vortex System of a Rotor with Cyclic Pitch

Braukmann, Johannes N. and Wolf, Christian and Goerttler, Andreas and Raffel, Markus (2020) Blade Tip Vortex System of a Rotor with Cyclic Pitch. AIAA Journal, 58 (7), pp. 2869-2880. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.J058678. ISSN 0001-1452.

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Official URL: https://doi.org/10.2514/1.J058678


To characterize the vortex system of a helicopter rotor with cyclic pitch, an experimental investigation is carried out at the rotor test facility of the DLR, German Aerospace Center in Göttingen. A test case with attached flow conditions is chosen to study the blade tip vortex aerodynamics on a four-bladed rotor. The resulting azimuth-dependent vortex system of the rotor is analyzed. In addition to velocity fields acquired by a particle image velocimetry system, the current investigation also uses a background-oriented schlieren setup to capture the density gradients caused by the blade tip vortices. These optical measurement techniques enable the reconstruction of the azimuth-dependent vortex system for vortex ages up to 70 deg. The pitch variation, and thus the change in lift, is found to be the main influence on the characteristics of the tip vortex system. The topology of the vortex, the interconnected shear layer, and the position of the vortex with respect to the blade tip appear to be highly pitch dependent. An analysis of the blade tip vortices is carried out, focusing on the swirl velocity, core radius, and circulation distribution. The results are compared to previous investigations at the same test facility and a numerical simulation.

Item URL in elib:https://elib.dlr.de/135809/
Document Type:Article
Additional Information:eISSN 1533-385X
Title:Blade Tip Vortex System of a Rotor with Cyclic Pitch
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Braukmann, Johannes N.UNSPECIFIEDhttps://orcid.org/0000-0001-8046-9623UNSPECIFIED
Wolf, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-9052-7548UNSPECIFIED
Goerttler, AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-8315-1298UNSPECIFIED
Raffel, MarkusUNSPECIFIEDhttps://orcid.org/0000-0002-3340-9115133716096
Date:July 2020
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 2869-2880
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Helicopter, rotor, vortex, BOS, PIV, experiment
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Carter, Beatrice
Deposited On:09 Sep 2020 21:27
Last Modified:24 Oct 2023 14:43

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