Snecma

Snecma Moteurs

Eric Jean-Louis Bouty

Georges Jean Xavier Riou

Thomas Alain Christian Vincent

Thierry Jacques Albert Le Docte

Alain Dravet

Alain Alphonse L&eacute;opold Thomas

Ang&eacute;lique H&eacute;l&egrave;ne Antoine

A device for attenuating acoustical noise from an exhaust nozzle of a turbojet is disclosed. The turbojet exhaust nozzle includes a central body defining the inner surface of the primary gas flow path. The central body includes an outer wall defining one, and only one, resonator cavity. The single resonator cavity is in fluid communication with the primary gas flow path via orifices through at least one upstream portion of the outer wall. The single resonator cavity and plurality of orifices compose a Helmholtz resonator.

Central body of a turbojet nozzle

A process for attenuating noise generated in a turbomachine by the interaction of rotor blades with stator vanes downstream of the rotor blades comprises the injection of a fluid in continuous jets upstream of the blades through a number of orifices equal to the number of vanes. The orifices are arranged in a ring and are capable of pivoting about the rotor axis by an angle at least equal to the angular pitch between two consecutive vanes. The angular position is controlled so that the sound waves produced by the interaction between the jets and the blades are of opposite phase to those produced by the interaction of the blades with the vanes.

Process and device for attenuating the noise made in a turbomachine by rotor/stator interaction

Growing community of inventors

Moissy Cramayel, France

Eric Jean-Louis Bouty