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Linearly Variable Chord-Extension Morphing for Helicopter Rotor Blades

Majeti, Rohin Kumar and van der Wall, Berend G. and Balzarek, Christoph (2019) Linearly Variable Chord-Extension Morphing for Helicopter Rotor Blades. In: Vertical Flight Society's 75th Annual Forum and Technology Display. Vertical Flight Society Annual Forum 75, 13.-16. May 2019, Philadelphia, PA, USA.

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A new morphing concept called linearly variable chord-extension was studied for its effectiveness in improving the efficiency of a helicopter rotor. Apart from chord-extension itself, an additional feature which is deflection of the extended part of the chord resulting in an effective camber and additional twist to the airfoil, is also studied for its effect on rotor efficiency improvement. Trim analyses were carried out for various chord-extended rotors for hover as well as various forward flight velocities using DLR in-house comprehensive analysis code S4. Chord-extension of up to 100% and chord-extension-deflection of up to 15 deg were considered. Results show that the linearly variable chord-extension concept is effective in reducing power requirement in both hover and forward flight. Deflection of the extended chord also helps reduce power requirement in hover, especially at higher blade loadings. However, the root torsional moments and hence, the pitch-link loads are seen to increase substantially for the morphed rotors.

Item URL in elib:https://elib.dlr.de/127530/
Document Type:Conference or Workshop Item (Speech)
Title:Linearly Variable Chord-Extension Morphing for Helicopter Rotor Blades
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Majeti, Rohin KumarUNSPECIFIEDhttps://orcid.org/0000-0003-0634-8051UNSPECIFIED
van der Wall, Berend G.UNSPECIFIEDhttps://orcid.org/0000-0001-6144-0921UNSPECIFIED
Balzarek, ChristophUNSPECIFIEDhttps://orcid.org/0000-0003-4889-0340UNSPECIFIED
Date:13 May 2019
Journal or Publication Title:Vertical Flight Society's 75th Annual Forum and Technology Display
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:SABRE, Helicopter Rotor, Morphing, Chord morphing
Event Title:Vertical Flight Society Annual Forum 75
Event Location:Philadelphia, PA, USA
Event Type:international Conference
Event Dates:13.-16. May 2019
Organizer:Vertical Flight Society
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 Innovative Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Majeti, Rohin Kumar
Deposited On:27 May 2019 08:10
Last Modified:15 Mar 2022 08:53

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