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

Philippe M Paris

Michel S Guimier

Patrick R Derouet

Patrick Kapala

The system makes it possible to reduce the clearances existing between the rotor and stator of a turbine (40) of a turbo jet engine during the various operating phases of the latter whilst keeping the temperatures of the disks inside the limits of their mechanical behaviour. The disks (4) of the turbine (40) are ventilated via the sampling of high pressure air at a high temperature (2) and the stator via the sampling of low pressure air at a low temperature (3). The respective temperatures of these two samplings are homogenized by a heat exchanger (1). This exchanger is short-circuited by a branch circuit connection (5) on the low pressure circuit so as to keep as stable as possible the clearances inside the turbine (40) according to the various ranges of capacity of the turbo jet engine by means of a valve (6) controlled by the computer. Application for aircraft turbo jet engines.

System for ventilating the turbine disks and stator of a turbo jet engine

The adjustment of the play separating the stators and the rotor is effected automatically and jointly with adjustment of the phase angle of the stators. For each startor, at least one slug is used, the slug being mounted for sliding in an oblique groove of a bush integral with the stator. A bush, groove and slug arrangement can also be provided for an adjustable stop on the starter to adjust the play between a free extremity of the rotor blade and the adjustable stop on the stator. Pivoting of each stator provokes a systematic modification of the play.

Turbomachine equipped with means for adjusting the play between the

A unitary exhaust gas housing for a turbo-engine comprises an outer ring, two intermediate rings defining the flow path for the hot gases, and an inner ring forming a hub with a hollow annular chamber. A temperature control device is provided including a bleed tube having one end fixed and communicating with the gas flow path for drawing off hot gases therefrom, the other end of the tube passing into the hollow chamber of the hub where it regulates the flow of gases by variation of the clearance j between the end of the tube and the opposing wall of the hub in response to relative radial movements of the tube and the hub according to the thermal states of the assembly.

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le Mee sur Seine, France

Philippe M Paris