Effect of Roughness on the Aeroacoustic Performance of Rotor Noise at Low Reynolds Number Article Swipe
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· 2024
· Open Access
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· DOI: https://doi.org/10.61782/fa.2023.0753
· OA: W4391028650
The actual and future multiplication of unmanned aerial vehicles (UAV) in urban settings calls for a better understanding and optimization of the aeroacoustic noise produced by their rotors.This phenomenon is associated with low Reynolds numbers, compared to what is usually seen on helicopters for example.At these Reynolds numbers, both tonal and broadband components are present, and the question of the transition to turbulence in the boundary layers (in particular on the pressure side) is of critical importance.In this experimental study, the use of 3D printing techniques allows for the comparison of multiple rotor models, with an emphasis on roughness heights, their influence on boundary layer transition and on the final emitted noise.Measurements are performed in an anechoic chamber and include noise levels around the rotor and thrust levels.
