Snecma Moteurs

Thierry Jean-Maurice Niclot

Patrice Suet

Christophe Yvon Gabriel Tourne

Alain Raffy

Pierre Emmanuel Etienne Debeneix

Olivier Jean-Jacques Louaisil

Philippe Roger Fernand Guerout

Thomas Chereau

Gilles G&eacute;rard Claude Lepretre

Olivier Louis Fernand Huppe

The invention relates to a device for passive control of the thermal expansion of the extension casing of a turbo-jet engine, said extension casing surrounding the casing of the high pressure compressor of the turbo-jet engine, and including a flange for attachment to an upstream flange of the casing of the combustion chamber. It is characterised in that at least one circumferential cavity is provided between both said flanges wherein circulates a gas flux tapped at the inlet of the combustion chamber. One uses thus a natural circulation generated by the differential pressure. Thanks to the device of the invention, the flange is passively controlled, and the stresses resulting from a differential expansion between the skin of the casing and its attachment flange are reduced.

Device for passive control of the thermal expansion of the extension casing of a turbo-jet engine

The stator shroud is made up of components ( ) juxtaposed so as to form circumferences, which are successive and assembled separately to a common housing which surrounds them. Characteristically, the assembly is made with only one single fixing point ( ) per component ( ), while being completed by a support point ( ) sliding along the circumference. The result is a more flexible component assembly and a more even distortion, which allows better control of the clearances between the shroud and the rotor blades it surrounds.

Internal stator shroud

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Savigny sur Orge, France

Thierry Jean-Maurice Niclot