Nozzles for gas turbine
A variable area nozzle, eg. for a turbo jet engine, comprises a blade assembly (6) subject to control actuators (2), the bodies of which at their downstream ends are assembled by projections (2 c , 2 d ) and coupling members (4 c - 4 d ) so as to form, downstream, a first structure either polygonal...
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Zusammenfassung: | A variable area nozzle, eg. for a turbo jet engine, comprises a blade assembly (6) subject to control actuators (2), the bodies of which at their downstream ends are assembled by projections (2 c , 2 d ) and coupling members (4 c - 4 d ) so as to form, downstream, a first structure either polygonal or circular, and rigid. Rocking levers (16), which transmit the control forces of the piston rods (14) of the actuators (2) to the blades (6) through rods (20 a , 20 b ), are interconnected at their ends (16 c , 16 d ) so as to form, upstream, a second polygonal or circular structure providing the synchronisation of the blades (6). The invention is applicable to both convergent nozzles and convergent-divergent nozzles.
Les corps des vérins (2) de commande des pivotements des volets convergents (6) sont assemblés, vers l'aval, par leurs pattes (2c, 2d) et des organes d'accouplement (4c-4d), de façon à former, en aval, une première structure, polygonale ou circulaire, et rigide. Selon l'invention, les palonniers (16), qui transmettent les efforts de commande des tiges (14) des vérins (2), aux volets (6), par des biellettes (20a, 20b), sont accouplés entre eux par leurs extrémités (16c, 16d) de façon à former, en amont, une seconde structure polygonale, assurant la synchronisation des volets (6).L'invention est applicable aussi bien aux tuyères convergentes qu'aux tuyères convergentes-divergentes. |
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