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An Overview Of DLR Compound Rotorcraft Aerodynamics and Aeroacoustics Activities within the CleanSky2 NACOR Project

Marc Wentrup, Jianping Yin, Philipp Kunze, Thomas Streit, Jan-Hendrik Wendisch, Thorsten Schwarz, DLR Braunschweig, Germany; Jean-Paul Pinacho, Klaus Kicker, Raphaël Fukari, Airbus Helicopters

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An Overview Of DLR Compound Rotorcraft Aerodynamics and Aeroacoustics Activities within the CleanSky2 NACOR Project

  • Presented at Forum 74
  • 16 pages
  • SKU # : 74-2018-1240
  • Your Price : $30.00
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An Overview Of DLR Compound Rotorcraft Aerodynamics and Aeroacoustics Activities within the CleanSky2 NACOR Project

Authors / Details: Marc Wentrup, Jianping Yin, Philipp Kunze, Thomas Streit, Jan-Hendrik Wendisch, Thorsten Schwarz, DLR Braunschweig, Germany; Jean-Paul Pinacho, Klaus Kicker, Raphaël Fukari, Airbus Helicopters

Abstract
The challenge of increasing range and speed of a rotorcraft is encountered in the scope of the European CleanSky2 "Fast Rotorcraft" project by Airbus Helicopters with the compound helicopter design RACER (RapidAndCostEfficientRotorcraft) for which the box wing and the tail parts designs are respectively protected by patent. This paper presents the DLR contributions to the RACER development. This includes the aerodynamic design of the wing and tail section as well as an overall assessment of performance and noise. In a first step the aerodynamic properties of the configuration are evaluated both isolated and with consideration of the main rotor and lateral rotor interferences by the use of actuator discs. In the second step, the investigated possibilities to improve the configurations performance are described. These include airfoil design for improved high lift performance of the wing and tail section, an optimization of the box wing circulation distribution on the upper and lower wing. Additionally, the intersection fairings were improved and the efficiency of the trim flaps was evaluated. In this regard, it could be determined for which cases an isolated approach is appropriate and when the rotor interference should be considered. At the end the evaluation of the aero acoustics of the configuration is conducted. The applied configuration shows good aerodynamic characteristics with some further cruise and off design optimization potential.

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  • An Overview Of DLR Compound Rotorcraft Aerodynamics and Aeroacoustics Activities within the CleanSky2 NACOR Project

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