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RACER high-speed demonstrator: Rotor and rotor-head wake interactions with tail unit

Caroline Lienard, Itham Salah el Din, Thomas Renaud, ONERA, The French Aerospace Lab; Raphaël Fukari, Airbus Helicopters

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RACER high-speed demonstrator: Rotor and rotor-head wake interactions with tail unit

  • Presented at Forum 74
  • 13 pages
  • SKU # : 74-2018-0177
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RACER high-speed demonstrator: Rotor and rotor-head wake interactions with tail unit

Authors / Details: Caroline Lienard, Itham Salah el Din, Thomas Renaud, ONERA, The French Aerospace Lab; Raphaël Fukari, Airbus Helicopters

Abstract
Within the framework of NACOR project in CleanSky 2 AIRFRAME ITD, ONERA and DLR performed parallel investigations dealing with the RACER high-speed demonstrator, and especially with its tail parts, each partner respectively focusing on vertical fins (ONERA) and horizontal stabilizer (DLR). During this design phase, most of the CFD simulations were steady-state and neglected the effect of the rotor (or rotor-head) and of the propellers. It however turned out that the rotor-head had a significant effect on the vertical fins and that it was essential to take into account its rotation in time-accurate simulations: the wake from the rotor-head, the upper deck and the engine cowlings indeed strongly impacts the left vertical fin because of the clockwise rotation of the rotor-head. It induces strong oscillations on the tail unit loads, and the mean tail unit lateral thrust is also significantly increased. Moreover the main conclusions of this `aerodynamic interactions' investigation are almost identical, no matter what the computed configuration: rotating rotor-head, rotating rotor-head with actuator-disk, rotating full-rotor or rotating full-rotor with propellers effect.

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