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Towards silent Micro-Air Vehicles: optimization of a low Reynolds number rotor in hover

Serré, Ronan and Gourdain, Nicolas and Jardin, Thierry and Jacob, Marc C. and Moschetta, Jean-Marc Towards silent Micro-Air Vehicles: optimization of a low Reynolds number rotor in hover. (2019) International Journal of Aeroacoustics, 18 (8). 690-710. ISSN 1475-472X

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Official URL: https://doi.org/10.1177/1475472X19890260

Abstract

The demand in Micro-Air Vehicles (MAV) is increasing as well as their potential missions. Either for discretion in military operations or noise pollution in civilian use, noise reduction of MAV is a goal to achieve. Aeroacoustic research has long been focusing on full scale rotorcrafts. At MAV scales however, the hierarchization of the numerous sources of noise is not straightforward, as a consequence of the relatively low Reynolds number that ranges typically from 5,000 to 100,000 and low Mach number of approximately 0.1. This knowledge however, is crucial for aeroacoustic optimization and blade noise reduction in drones. This contribution briefly describes a lowcost,numerical methodology to achieve noise reduction by optimization of MAV rotor blade geometry. Acoustic power measurements show a reduction of 8 dB(A). The innovative rotor blade geometry allowing this noise reduction is then analyzed in details, both experimentally and numerically with Large Eddy Simulation using Lattice Boltzmann Method (LES-LBM). Turbulence interaction noise is shown to be a major source of noise in this configuration of low Reynolds number rotor in hover, as a result of small scale turbulence and high frequency unsteady aeroadynamics impinging the blades at the leading-edge.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Vestas Porto Design Center (POTUGAL)
Laboratory name:
Funders:
Direction générale de l'Armement
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Deposited On:16 Dec 2019 13:45

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