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Airborne Acquisition of Blade Tip Displacements and Vortices on a Coaxial Helicopter

Bauknecht, Andre and Raffel, Markus and Grebing, Benedikt (2018) Airborne Acquisition of Blade Tip Displacements and Vortices on a Coaxial Helicopter. Journal of Aircraft, 55 (5), pp. 1995-2007. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.C034647. ISSN 0021-8669.

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Official URL: https://arc.aiaa.org/doi/10.2514/1.C034647


A series of comprehensive flight tests investigated the flight dynamics and explored the flight envelope of a newly developed ultralight, coaxial, counter-rotating helicopter from the company edm aerotec. The present paper focuses on optical measurement techniques that were applied to study the minimum blade tip clearance and convection of blade tip vortices around the dual-rotor system. A calibrated single-camera system was used to quantify the movement and distances of the blade tips at a critical rotor azimuth for multiple steady and unsteady flight maneuvers. The measurements allowed critical flight conditions to be identified and provided flight data for the validation of comprehensive rotor codes. In an additional flight test, an airborne background-oriented schlieren system was operated aboard a second helicopter to visualize the blade tip vortices of the ultralight helicopter in forward flight. The background-oriented schlieren measurements resulted in the first visualization of blade-vortex and vortex-structure interaction effects on a full-scale coaxial helicopter. The application of optical measurement systems in the present flight tests gives valuable insight into the aerodynamics and blade dynamics of a free-flying counter-rotating helicopter and demonstrates how these methods can effectively support the development process of new rotorcraft.

Item URL in elib:https://elib.dlr.de/122023/
Document Type:Article
Title:Airborne Acquisition of Blade Tip Displacements and Vortices on a Coaxial Helicopter
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bauknecht, AndreUniversity of Maryland, USAUNSPECIFIEDUNSPECIFIED
Raffel, MarkusUNSPECIFIEDhttps://orcid.org/0000-0002-3340-9115133716051
Grebing, Benediktedm aerotec, GeisledenUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1995-2007
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:flight test, coaxial, helicopter, deformation, rotor blade, SPR
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: Winkels, Elisabeth
Deposited On:17 Oct 2018 17:10
Last Modified:22 Nov 2023 07:32

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