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

Bauknecht, André and Grebing, Benedikt and Raffel, Markus (2017) Airborne Acquisition of Blade Tip Displacements and Vortices on a Coaxial Ultralight Helicopter. In: 33rd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2017. AIAA Aviation and Aeronautics Forum and Exposition 2017, 05.-09.Juni 2017, Denver, CO, USA. doi: 10.2514/6.2017-3552.

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Official URL: http://aviation.aiaa.org/Forum.aspx?id=31203


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 (BOS) system was operated aboard a second helicopter to visualize the blade tip vortices of the ultralight helicopter in forward flight. The BOS 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/113264/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Abstract
Title:Airborne Acquisition of Blade Tip Displacements and Vortices on a Coaxial Ultralight Helicopter
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bauknecht, AndréUNSPECIFIEDhttps://orcid.org/0000-0002-4076-780XUNSPECIFIED
Raffel, MarkusUNSPECIFIEDhttps://orcid.org/0000-0002-3340-9115138879541
Journal or Publication Title:33rd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Coaxial ultralight rotorcraft technology, flight test, blade tip displacement, blade tip vortex visualization, background-oriented schlieren
Event Title:AIAA Aviation and Aeronautics Forum and Exposition 2017
Event Location:Denver, CO, USA
Event Type:international Conference
Event Dates:05.-09.Juni 2017
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: Bachmann, Barbara
Deposited On:05 Oct 2017 16:58
Last Modified:18 Jul 2023 14:39

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