noise reduction device emitted by the jet of an aircraft propulsion engine

摘要

device for reducing noise emitted by the jet of an aircraft propulsion engine. The present invention relates to a gas ejection nozzle, in particular for aircraft propulsion, and which includes at least a downstream portion which has a "gasketed" back edge formed by gaskets (40) which are distributed along of the periphery of the nozzle, each gasket extending downstream between upstream transverse plane 43 and a downstream transverse plane with free edges oriented in two converging downstream directions defining said rear edge. gaskets ensure the creation of vortex windings at the nozzle edge of the jet. The nozzle is characterized by including a means (50) for injecting auxiliary gas jets (a 1). said auxiliary jets are injected downstream of said free edges (41, 42) of the gaskets, leading upstream from said upstream plane (43) of the gaskets, in order to initiate said windings upstream of the free edges of the gaskets.