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Aerodynamic and structural investigation of an active back-flow flap for dynamic stall control

Opitz, Steffen and Gardner, Anthony Donald and Kaufmann, Kurt (2013) Aerodynamic and structural investigation of an active back-flow flap for dynamic stall control. 39th EUROPEAN ROTORCRAFT FORUM - ERF2013, 03. - 06. Sept. 2013, Moscow, Russia.

Full text not available from this repository.

Official URL: http://erf2013.org/files/erf2013-final_programme.pdf

Abstract

The design and experimental investigation of a back-flow flap for helicopter dynamic stall control is described. A spoiler-type flap is designed, and shown by CFD to reduce the pitching moment peak during dynamic stall by 34%. Initial experiments with a passively actuated flap in a lowspeed wind tunnel showed that the opening and closing times for the flap due to the aerodynamic forces are sufficiently short and that the flap is not affected by the inertial forces of the model pitching. The experiments showed the need for a flap restraint, and that an active actuation is needed so that the flap angle is sufficient at the time of stall to have a control effect. Initial demonstrators for the structural concept of the active back-flow flap using glass-fibre reinforced polymer and a solid-state hinge are presented, showing the possibility of fabrication as an after-market add-on.

Item URL in elib:https://elib.dlr.de/81381/
Document Type:Conference or Workshop Item (Speech)
Title:Aerodynamic and structural investigation of an active back-flow flap for dynamic stall control
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Opitz, SteffenUNSPECIFIEDUNSPECIFIED
Gardner, Anthony DonaldUNSPECIFIEDUNSPECIFIED
Kaufmann, KurtUNSPECIFIEDUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-12
Series Name:Conference Proceedings on USB-Stick
Status:Published
Keywords:helicopter, flow control, backflow flap, dynamic stall, rotor, DLR-TAU, GFRP
Event Title:39th EUROPEAN ROTORCRAFT FORUM - ERF2013
Event Location:Moscow, Russia
Event Type:international Conference
Event Dates:03. - 06. Sept. 2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft (old)
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Gardner, Dr.habil. Anthony
Deposited On:29 Nov 2013 10:59
Last Modified:08 May 2014 23:17

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