Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Xavier Jean Guyonnet

Philippe Louis Alassoeur

Ludovic Edmond Molliex

Andre C Collot

Gilles Charles Klein

Pascal Michel Le Jeune

An afterburn device for a turbojet engine comprises a flame arrester formed by a plurality of radial arms distributed evenly around the rotational axis of the engine at the upstream end of the afterburn chamber. Each arm consists of a fixed rear part, and a front part which is separable from the rear part in a circumferential direction along a median joint plane, the front parts being carried on a ring which is rotatably mounted on the outer casing of the engine. Drive means is provided for rotating the ring between a first position for dry operation, and a second position for afterburn operation. In the first position the front and rear parts of the arms are aligned and joined to provide the arms with a streamlined, low-drag, zero angle of incidence profile suitable for dry operation. In the second position the front parts of the arms are separated circumferentially from the rear parts so as to alternate with the rear parts, the front and rear parts creating turbulence which acts to arrest the flame during afterburn operation.

Afterburner flame holder with rotationally-splitting radial arms

A method of producing a fibre-reinforced metallic circular part having a tral hollow, wherein the reinforcing fibres are disposed in the part in the vicinity of the hollow, comprises providing an annular metallic blank with a channel-sectioned groove opening towards the axis of the blank, placing uncompressed concentric layers of the reinforcing fibres and additional metal alternately in the groove followed by a more rigid expansion ring, evacuating the groove and sealing it by a deformable closure member which covers the groove, placing this assembly in an autoclave and subjecting it to a temperature and pressure sufficient to effect superplastic forging of the layers of additional metal whereby the fibre layers and the additional metal layers are compressed and welded to the blank in a single operation, and machining the resulting assembly to obtain the required shaped part.

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St Fargeau Ponthierry, France

Xavier Jean Guyonnet