Shrouded tail rotors found on some helicopters are a french design called Fenestron. Although the rotors provide increasedperformance, acoustics emissions can be reduced in some in-flight configurations. The purpose of the Fenestron NoiseStudy program funded by the French Directorate for Civil Aeronautics Programs (DPAC) and based on earlier researchcontracts is to improve and validate the aerodynamic/acoustic numerical tools dedicated to the analysis and prediction ofFenestron generated noise. The Flight Test Center at Istres and the Eurocopter company are involved in this program that isled by the ONERA Department of Digital Flow Simulation and Aeroacoustics (DSNA).The program has planned for two flighttest campaigns. Its purpose is to study the sources of the noise nuisance generated by the Fenestron rotor on the Dauphin365N helicopter. A first test campaign has been carried out in 2008 but another complementary test campaign will beconducted to take acoustic measurements on the ground. The ONERA computation tools should enable industry to improvethe definition of the rotor type Fenestron so that its noise emission is significantly reduced.
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