Advances in aircraft and spacecraft science

  • 제1권1호
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  • Pages.69-91
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  • 2014
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  • 2287-528X(pISSN)
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  • 2287-5271(eISSN)
테크노프레스 (Techno-Press)
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An active back-flow flap for a helicopter rotor blade

  • Opitz, Steffen (German Aerospace Center (DLR), Institute of Composite Structures and Adaptive Systems) ;
  • Kaufmann, Kurt (German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology) ;
  • Gardner, Anthony (German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology)
  • 투고 : 2013.06.18
  • 심사 : 2013.11.01
  • 발행 : 2014.01.31
⟨ 이전 논문 다음 논문 ⟩

초록

Numerical investigations are presented, which show that a back-flow flap can improve the dynamic stall characteristics of oscillating airfoils. The flap was able to weaken the stall vortex and therefore to reduce the peak in the pitching moment. This paper gives a brief insight into the method of function of a back-flow flap. Initial wind tunnel experiments were performed to define the structural requirements for a detailed experimental wind tunnel characterization. A structural integration concept and two different actuation mechanisms of a back-flow flap for a helicopter rotor blade are presented. First a piezoelectric actuation system was investigated, but the analytical model to estimate the performance showed that the displacement generated is too low to enable reliable operation. The seond actuation mechanism is based on magnetic forces to generate an impulse that initiates the opening of the flap. A concept based on two permanent magnets is further detailed and characterized, and this mechanism is shown to generate sufficient impulse for reliable operation in the wind tunnel.

키워드

참고문헌

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피인용 문헌

  1. Reduction of dynamic stall using a back-flow flap vol.8, pp.2, 2017, https://doi.org/10.1007/s13272-017-0237-4
  2. Shift Steering Control of 2-axis ARM Helicopter based on a Neural Network vol.21, pp.7, 2015, https://doi.org/10.5302/J.ICROS.2015.15.0033
  3. Influence of a back-flow flap on the dynamic stall flow topology 2017, https://doi.org/10.1007/s13272-017-0274-z