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Wake Characterization of a Free-Flying Model Helicopter in Ground Effect

Schwarz, Clemens and Bauknecht, Andre and Mailänder, Stephan and Raffel, Markus (2019) Wake Characterization of a Free-Flying Model Helicopter in Ground Effect. Journal of the American Helicopter Society, 64 (012010). American Helicopter Society. DOI: 10.4050/JAHS.64.012010 ISSN 0002-8711

Full text not available from this repository.

Official URL: https://vtol.org/news/forum-74-proceedings-now-available

Abstract

Measurements of the flow field around a free-flying model helicopter in ground effect were performed for both quasi-steady and unsteady maneuvering flights using stereoscopic particle image velocimetry. Changing flow patterns like recirculation and ground vortex flow were observed for forward flight at low advance ratios and found to be in good agreement with existing wind tunnel data. Parameters describing both general wake structures and single blade tip vortices showed significant dependence on the forward flight velocity. Landing approaches were performed, and large vortical structures were observed close to the rotor disk, which contained distinctly higher velocities and momentum fluxes than expected from quasi-steady conditions at the same advance ratios. For a vertical takeoff maneuver with a rapid increase of collective pitch, the bundling of blade tip vortices into a "starting vortex" was observed, with circulation values up to six times higher than for a single blade tip vortex.

Item URL in elib:https://elib.dlr.de/126152/
Document Type:Article
Title:Wake Characterization of a Free-Flying Model Helicopter in Ground Effect
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schwarz, ClemensClemens.Schwarz (at) dlr.deUNSPECIFIED
Bauknecht, AndreUniversity of Marylandhttps://orcid.org/0000-0002-4076-780X
Mailänder, StephanUniversität StuttgartUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115
Date:11 January 2019
Journal or Publication Title:Journal of the American Helicopter Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:64
DOI :10.4050/JAHS.64.012010
Editors:
EditorsEmail
UNSPECIFIEDVertical Flight Society
Publisher:American Helicopter Society
ISSN:0002-8711
Status:Published
Keywords:Particle Image Velocimetry (PIV), model helicopter, ground effect, maneuvering flight, free flight experiments, blade-tip vortex
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:24 Jan 2019 14:40
Last Modified:24 Jan 2019 14:40

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