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Flow Measurement Techniques for Rotor Wake Characterization on Free-Flying Helicopters in Ground Effect

Bauknecht, Andre and Schwarz, Clemens and Raffel, Markus and Mailänder, Stephan (2019) Flow Measurement Techniques for Rotor Wake Characterization on Free-Flying Helicopters in Ground Effect. In: AIAA Scitech Forum, 2019. AIAA SciTech 2019, 7.-11. Jan. 2019, San Diego, CA, USA. DOI: 10.2514/6.2019-2107 ISBN 978-162410578-4

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Official URL: https://arc.aiaa.org/doi/abs/10.2514/6.2019-2107

Abstract

Helicopter operation close to the ground is of interest to the rotorcraft community as the rotor wake can lift up sediment particles from the ground, causing deteriorated visual conditions for the pilot - a phenomenon that is referred to as brownout. The impact of unsteady maneuvering flight on brownout is still unclear and quantitative flow field measurements are needed to better understand the underlying physical effects. The present work investigates particle image velocimetry (PIV) and the background-oriented Schlieren (BOS) technique for studying the rotor wakes of free-flying helicopters close to the ground. Two flight tests with a model helicopter and a full-scale BO 105 helicopter were conducted and time-resolved stereoscopic PIV and BOS data were acquired during steady and unsteady flight maneuvers in ground effect. This paper discusses the measurement setups realized in these flight tests, technical challenges of implementing the measurement methods in a flight test environment, and example flow field results. The presented measurement data and evaluated results demonstrate the successful first application of PIV, time-resolved BOS, and combination of both measurement techniques on free-flying model- and full-scale helicopters. This novel application of full-scale flow measurements enables a more complete investigation of flow phenomena in the wake of free-flying helicopters close to the ground and will contribute to better understanding rotor wake interactions such as brownout.

Item URL in elib:https://elib.dlr.de/125448/
Document Type:Conference or Workshop Item (Speech)
Title:Flow Measurement Techniques for Rotor Wake Characterization on Free-Flying Helicopters in Ground Effect
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bauknecht, AndreUniversity of Marylandhttps://orcid.org/0000-0002-4076-780X
Schwarz, ClemensClemens.Schwarz (at) dlr.deUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115
Mailänder, StephanUniversität StuttgartUNSPECIFIED
Date:January 2019
Journal or Publication Title:AIAA Scitech Forum, 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI :10.2514/6.2019-2107
ISBN:978-162410578-4
Status:Published
Keywords:Full-scale helicopter, Particle image velocimetry (PIV), Background-oriented schlieren (BOS), Ground effect, Free flight experiments
Event Title:AIAA SciTech 2019
Event Location:San Diego, CA, USA
Event Type:international Conference
Event Dates:7.-11. Jan. 2019
Organizer:AIAA
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 13:58
Last Modified:02 Aug 2019 13:18

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