Feasibility of hovering small-scale low Reynolds number rotor-beam source localization by microphone array measurements - Institut Supérieur de l'Aéronautique et de l'Espace
Communication Dans Un Congrès Année : 2024

Feasibility of hovering small-scale low Reynolds number rotor-beam source localization by microphone array measurements

Résumé

The radiation of a small-scale low Reynolds number two-bladed rotor of 0, 2 diameter with NACA0012 blade profile in interaction with cylindrical beams at different locations is measured in anechoic room by an array of 45 microphones. Source localization algorithms are used to localize tonal noise sources associated to blade passing frequency (BPF) harmonics that are increased by the presence of the beam in order to better understand noise source generation mechanisms. A first set of BPF harmonics, consisting of a hump centered around 5 ∗ BPF , appears to be localized above the rotor near the blade tip, whereas a second set of BPF harmonics, consisting of a hump centered around 20 − 25 ∗ BPF , seems to have its origin just below the beam in most cases and at ∼ 85% of the blade radius. The increase of rotational speed, beam diameter and the decrease of rotor-beam distance leads to an increase of the first BPF harmonics hump sound levels with similar source locations, except for the noisier rotor-beam configuration for which both humps are located near the blade tip. As this was not consistent with numerical simulations performed on the same configuration which showed that first BPF harmonics levels were associated to unsteady loading on the beam, new simulations were performed to obtain wave fronts between the rotor-beam setup and the array. This allows to explain source locations on maps and to identify which sources were associated to the beam.


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Dates et versions

hal-04887552 , version 1 (15-01-2025)

Identifiants

  • HAL Id : hal-04887552 , version 1

Citer

Hélène Parisot-Dupuis, Romain Gojon, Nicolas Doué, Bertrand Mellot. Feasibility of hovering small-scale low Reynolds number rotor-beam source localization by microphone array measurements. 30th AIAA/CEAS Aeroacoustics Conference, Jun 2024, Rome, Italy. ⟨hal-04887552⟩

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