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JET NOISE REDUCTION BY FLUIDIC INJECTION FROM A ROTATING PLUG

M. Koenig
Acoustics Department SNECMA, SAFRAN Group Moissy-Cramayel, FRANCE

C. Fourment-Cazenave
Département Fluides, Thermique et Combustion Institut Pprime CEAT, Poitiers, FRANCE

Peter Jordan
Department of Fluid, Thermal and Combustion Sciences Pprime Institute, CNRS-Universite de Poitiers, ISAE-ENSMA 43 rue de I'Aerodrome, F-86036 Poitiers CEDEX, France

Yves Gervais
Département Fluides, Thermique et Combustion Institut Pprime CEAT, Poitiers, FRANCE

Аннотация

We explore a novel jet noise reduction device involving the steady injection of fluid from two diametrically-opposed ports on a rotating centerbody. For the rotation speeds currently possible, noise reductions are observed over a low-frequency range, up to the rotation frequency. Preliminary results suggest that the noise reduction mechanism may be due to the most unstable flow modes (axisymmetric mode m = 0) being deprived of fluctuation energy due to an excitation of less unstable modes (azimuthal mode m = 2 driven at St = 0.23).