US 5,211,008 AGranted

Gas ejection nozzle for a jet engine and a jet engine fitted with this nozzle, in particular an engine of the separate flow type

AssigneeConception Aeronautique du Sud Ouest

InventorEtienne Fage

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Abstract

The invention relates to an ejection nozzle with a variable outlet section for a jet engine. An axially moving annular skirt (4) is disposed about the fixed nozzle wall (2) so that it can be displaced axially between an upstream position in which the skirt is disposed retracted about the fixed wall (2) and a downstream position in which it projects to the rear of the outlet section of this wall. A semiflexible crown (8) is provided to ensure the connection between the moving skirt (4) and the fixed wall (2), this crown bearing elastically about the wall (2). The invention makes it possible in particular to increase the outlet section of a central hot gas nozzle so as to ensure a reduction of the hot jet thrust when the thrust reversers are applied on the cold jet. It also makes it possible in certain flight conditions, especially during take-off in hot weather, to reduce the temperature of the hot outlet gases and thus to increase the speed of the gas generator and increase the direct jet thrust.

Claims11

Dependent claims

An ejection nozzle with a variable outlet section for a jet engine, of the type comprising a fixed wall having an inner jacket (2) whose shape converges towards the nozzle outlet, characterized in that it comprises:

an axially movable annular skirt (4) disposed about the inner jacket (2) and comprising a cylindrical upstream portion (4a) guided by the fixed nozzle wall and a downstream portion (4b) whose shape converges towards the nozzle outlet, the end of this downstream portion having a diameter greater than that of the outlet section of the inner jacket,
means for guiding and axially displacing the moving skirt (5-7, 9-12), disposed about and externally to the inner jacket (2) and adapted to allow this skirt to be moved in axial translation between an upstream position in which the skirt is fully retracted about the inner jacket and a downstream position in which the downstream position of the skirt is disposed to the rear of the outlet section of the inner jacket, and
a semi-flexible crown (8) connecting the moving skirt (4) and the fixed inner jacket (2), this semi-flexible crown being connected to the skirt so as to be displaced therewith and bearing elastically about the inner jacket so as to remain in contact with the outer surface thereof during its displacement.

Dependencies are inferred from the claim text.