Opitz, Steffen and Gardner, Anthony Donald and Kaufmann, Kurt (2014) Aerodynamic and structural investigation of an active back-flow flap for dynamic stall control. CEAS Aeronautical Journal, 5 (3), pp. 279-291. Springer. DOI: 10.1007/s13272-014-0106-3. ISSN 1869-5582.
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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 low-speed 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 fiber reinforced polymer and a solid state hinge are pre-sented, showing the possibility of fabrication as an after-market add-on.
|Additional Information:||Published online: 29 March 2014|
|Title:||Aerodynamic and structural investigation of an active back-flow flap for dynamic stall control|
|Journal or Publication Title:||CEAS Aeronautical Journal|
|In ISI Web of Science:||No|
|Page Range:||pp. 279-291|
|Keywords:||Active flap, Solid state hinge, back-flow flap, flow control, helicopter, rotor blade|
|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|
|Location:||Braunschweig , Göttingen|
|Institutes and Institutions:||Institute of Composite Structures and Adaptive Systems > Multifunctional Materials|
Institute of Aerodynamics and Flow Technology > Helicopters
|Deposited By:||Steffen Opitz|
|Deposited On:||22 Aug 2014 11:37|
|Last Modified:||22 Aug 2014 11:37|
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