elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

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

Full text not available from this repository.

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

Abstract

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
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bauknecht, AndreUniversity of Maryland, USAUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115
Grebing, Benediktedm aerotec, GeisledenUNSPECIFIED
Date:2018
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:55
DOI :10.2514/1.C034647
Page Range:pp. 1995-2007
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0021-8669
Status:Published
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
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:15 Nov 2018 11:05

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.