Trailing edge for an aircraft engine, of the type with moving chevrons
View Patent ↗This trailing edge is of the type with moving chevrons ( 9 a, 9 b, 9 c ). It comprises actuating means able to cause these chevrons ( 9 a, 9 b, 9 c ) to move from a passive position in which they are directed substantially in the direction of the airflow leaving the said engine, into an active position in which at least part of each chevron is inclined with respect to this direction. This trailing edge is notable in that the said active position is derived from the said passive position by pivoting, possibly combined with a translational movement, of at least part of each chevron about an axis (Aa, Ab, Ac) substantially parallel to the said direction.
1. Noise abatement device for the trailing edge of a nozzle exhaust of hot gases or of an aircraft nacelle thrust inverter, said noise abatement device comprising:
a plurality of moving chevrons disposed on a trailing edge of an exhaust nozzle of a turbojet or on a trailing edge of an outer cowl of the turbojet, the chevrons being disposed adjacent a first direction of airflow from a first side of the trailing edge and a second direction of airflow from a second side of the trailing edge;
an actuating means able to cause the chevrons to move from a passive position in which the chevrons extend according to the first and second directions of airflow leaving the engine, into an active position in which at least part of each chevron is inclined with respect to the first and second directions of airflow, the actuating means being a low-dimensioned actuator means;
wherein the active position is derived from the passive position by pivoting, combined with a translational movement, of at least part of each chevron about an axis substantially parallel to the first and second directions of airflow.
2. Noise abatement device according to claim 1 , wherein the active position is derived from the passive position by a pivoting set of each chevron about the axis.
3. Noise abatement device according to claim 1 , wherein the active position is derived from the passive position by deformation, by twisting, of part of each chevron about the axis.
4. Noise abatement device according to claim 1 , wherein each chevron comprises a fixed part and a moving part mounted in rotation, by means of appropriate hinges onto the fixed part.
5. Noise abatement device according to claim 1 , wherein each chevron has an originally twisted shape.
6. Noise abatement device according to claim 1 , wherein the actuating means are able to cause a vibration of at least part of each chevron about the active position thereof.
7. Noise abatement device according to claim 1 , wherein the actuating means comprise return elastic means of each chevron towards the passive position thereof.
8. Noise abatement device according to claim 1 , wherein at least part of each chevron is mounted on a rod equipped with a helical groove cooperating with a fixed pawl.
9. Noise abatement device according to claim 1 , further comprising chevrons of various sizes.
10. Noise abatement device according to claim 1 , wherein the active positions of some of the chevrons are obtained by pivoting in an opposite direction with respect to the active positions of other chevrons.
11. Noise abatement device according to claim 1 , wherein the chevrons are mounted projecting.
12. Noise abatement device according to claim 1 , wherein the chevrons are mounted in inlay.
13. Noise abatement device according to claim 1 , wherein the chevrons are only distributed on one part of a circumference of the trailing edge.
14. Noise abatement device for the trailing edge of a nozzle exhaust of hot gases or an aircraft nacelle thrust inverter, said noise abatement device comprising:
a plurality of moving chevrons disposed on a trailing edge of an exhaust nozzle of a turbojet or on a trailing edge of an outer cowl of the turbojet, the chevrons being disposed adjacent a first direction of airflow from a first side of the trailing edge and a second direction of airflow from a second side of the trailing edge;
an actuating means able to cause the chevrons to move from a passive position in which the chevrons extend according to the first and second directions of airflow leaving the engine, into an active position in which at least part of each chevron is inclined with respect to the first and second directions of airflow, the actuating means being a low-dimensioned actuator means;
wherein the active position is derived from the passive position by pivoting at least part of each chevron about an axis substantially parallel to the first and second directions of airflow.