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Tuesday, July 9 • 17:10 - 17:30
ON COMBINED PROPELLER SYNCHRONIZATION AND EDGE SCATTERING FOR THE NOISE REDUCTION OF DISTRIBUTED PROPULSION SYSTEMS

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The paper is about the analytical modeling of the tonal aerodynamic noise generated by a doublet of subsonic contra-rotating open propellers mounted close to the edge of a rigid half-plane. The model accounts for a uniform mean flow parallel to the half-plane and perpendicular to its edge. Both propellers are in the same front plane with adjustable separation; their axes aligned with the mean flow are parallel with each other and parallel to the half-plane. This generic configuration is representative of future architectures in which distributed propulsion systems could be mounted above the rear part of a wing. The dominant tonal noise originates from the interaction of the propellers with azimuthal inflow distortions such as due to the wing boundary layer because of the vicinity of the wing. By synchronizing both propellers, some cancellation of the sound that would be radiated by the doublet towards the ground in the absence of the half-plane can be expected. The study is aimed at assessing the combined effect of this synchronization and of the sound scattering by the edge. The analytical model allows fast repeated calculations that could be used in an optimization procedure. The sound sources are the fluctuating lift forces on the blades acting as dipoles. Sound scattering by the edge is calculated by making intensive use of the half-plane Green's function with flow, the rotating sources being replaced by equivalent arrays of phased stationary sources. In the paper model predictions will be made to assess the influence of various parameters, including the positioning of the propellers in terms of vertical and horizontal distances from the trailing edge, the distance between both propellers, the blade number and the rotational speed.

Moderators
KH

Kaveh Habibi

Sr. Aeroacoustics Engineer, Siemens Gamesa Renewable Energy
LM

Luc Mongeau

Prof., McGill University
MR

Michel Roger

Professeur, Ecole Centrale de Lyon

Authors

Tuesday July 9, 2019 17:10 - 17:30 EDT
St-Laurent 6
  T03 Aero… aircrft noise & vibr., RS01 Aeroacoustics