Device for supplying cooling air to exhaust nozzle flaps
View Patent ↗A device for supplying cooling air to a hollow flap of an exhaust nozzle in a turbojet engine. The device includes a tube connecting the hollow flap to a cooling air source. The tube comprises at least one telescopic portion and at least one ball-joint connection.
1. A device for supplying cooling air comprising:
a turbojet engine exhaust nozzle including a hollow flap;
a source of cooling air; and
a tube connecting said hollow flap to said source of cooling air;
wherein said tube comprises a telescopic portion and one ball-joint connection.
2. A device according to claim 1 , wherein the hollow flap is a divergent hollow flap of a convergent-divergent exhaust nozzle.
3. A device according to claim 2 , wherein the convergent-divergent exhaust nozzle includes a convergent flap pivotally joined to a housing of the exhaust nozzle and the hollow divergent flap is pivotally joined to said convergent flap.
4. A device according to claim 3 , wherein the hollow divergent flap is servo-controlled.
5. A device according to claim 2 , wherein the hollow divergent flap is servo-controlled.
6. A device according to claim 1 , wherein the tube includes two ball-joint connections.
7. A device according to claim 6 , wherein the telescopic portion is located between the two ball-joint connections.
8. A device according to claim 1 , wherein the telescopic portion also acts as a pump.
9. A device according to claim 1 , wherein the source of cooling air comprises a tube on the periphery of a housing of an exhaust channel of a turbojet engine, bringing air from the secondary flow of the turbojet engine.
10. A turbojet engine comprising:
a variable section exhaust nozzle including a hollow flap;
a source of cooling air; and
a tube connecting said hollow flap to said source of cooling air;
wherein said tube comprises a telescopic portion and one ball-joint connection.
11. A turbojet engine according to claim 10 , wherein the exhaust nozzle belongs to one of the following groups of exhaust nozzles: convergent exhaust nozzles, convergent-divergent exhaust nozzles, bidimensional exhaust nozzles, pivotable exhaust nozzles.
12. A device according to claim 10 , wherein the hollow flap is a divergent hollow flap of a convergent-divergent exhaust nozzle.
13. A device according to claim 12 , wherein the convergent-divergent exhaust nozzle includes a convergent flap pivotally joined to a housing of the exhaust nozzle and the hollow divergent flap is pivotally joined to said convergent flap.
14. A device according to claim 13 , wherein the hollow divergent flap is servo-controlled.
15. A device according to claim 12 , wherein the hollow divergent flap is servo-controlled.
16. A turbojet engine according to claim 10 , wherein the tube includes two ball-joint connections.
17. A turbojet engine according to claim 16 , wherein the telescopic portion is located between the two ball-joint connections.
18. A turbojet engine according to claim 10 , wherein the telescopic portion also acts as a pump.
19. A turbojet engine according to claim 10 , wherein the source of cooling air comprises a tube on the periphery of a housing of an exhaust channel of a turbojet engine, bringing air from the secondary flow of the turbojet engine.