Nacelle with a displacement device for aircraft jet engine and aircraft including such nacelle
View Patent ↗A nacelle, for an aircraft jet engine having a high bypass ratio, in which a jet engine having a longitudinal axis is mounted. The nacelle includes a wall that concentrically, and at least partially, surrounds the jet engine and together defines an annular duct. The nacelle further includes a displacement device that controllably displaces a portion of the nacelle wall in order to modify the section of the flow outlet passage and form at least one longitudinally extending opening. A device for forming a fluid barrier along the at least one longitudinally extending opening is provided to counteract the natural exhaust.
1. An aircraft engine nacelle having a high bypass ratio, wherein there is installed an engine with longitudinal axis, the nacelle comprising:
a wall that concentrically surrounds the engine at least partially and that defines therewith an annular internal fluid flow conduit, which at a downstream end of the nacelle wall includes a flow-outlet passage cross section;
a displacement device to displace a part of the nacelle wall, on command, to vary the flow-outlet passage cross section and to create at least one aperture of longitudinal extension in the nacelle wall; and
a device located by the downstream end for injecting a high-energy fluid to form a fluidic barrier, the fluidic barrier extending along at least a part of the longitudinal extension of the at least one aperture to oppose natural escape of flow through the at least one aperture.
2. The nacelle according to claim 1 , wherein the device for forming a fluidic barrier includes at least one injection device to inject the high-energy fluid at right angles to the at least one aperture.
3. The nacelle according to claim 1 , further comprising a fluid-control device for controlled withdrawal of at least a part of an internal fluid flow to evacuate the at least a part of the internal fluid flow from the nacelle through the at least one aperture.
4. The nacelle according to claim 3 , wherein the fluid-control device for controlled withdrawal includes at least one injection device to inject the high-energy fluid into the internal fluid flow.
5. The nacelle according to claim 2 , wherein the at least one injection device is mounted upstream and/or downstream from the at least one aperture.
6. The nacelle according to claim 2 , wherein the at least one injection device is mounted on an internal face and/or an external face of the nacelle wall that bounds the annular conduit at an external periphery thereof.
7. The nacelle according to claim 6 , wherein the at least one injection device is mounted on the internal face of the nacelle wall and is at least partially in the at least one aperture, and
wherein the device for forming a fluidic barrier includes at least one mobile element for deflecting the injected high-energy fluid, the mobile element being disposed adjacent to the at least one injection device.
8. The nacelle according to claim 7 , wherein the at least one mobile element blocks an upstream zone of the at least one aperture to free a downstream zone thereof.
9. The nacelle according to claim 2 , wherein the at least one injection device is equipped with at least one nozzle for injecting the high-energy fluid.
10. The nacelle according to claim 2 , wherein the device for forming a fluidic barrier has a curved surface and is disposed tangentially at a discharging end of the at least one injection device to direct the injected high-energy fluid toward the said at least one aperture.
11. The nacelle according to claim 2 , further comprising a fluid-control device for controlled withdrawal of at least a part of an internal fluid flow to evacuate the at least a part of the internal fluid flow from the nacelle through the at least one aperture.
12. The nacelle according to claim 4 , wherein the at least one injection device is mounted upstream and/or downstream from the at least one aperture.
13. The nacelle according to claim 4 , wherein the at least one injection device is mounted on an internal face and/or an external face of the nacelle wall that bounds the annular conduit at an external periphery thereof.
14. The nacelle according to claim 13 , wherein the at least one injection device is mounted on the internal face of the nacelle wall and is at least partially in the at least one aperture, and
wherein the device for forming a fluidic barrier includes at least one mobile element for deflecting the high-energy injected fluid, the mobile element being disposed adjacent to the at least one injection device.
15. The nacelle according to claim 1 , wherein a first end of the displacement device is mounted to a front part of the nacelle wall, and
wherein a second end of the displacement device is mounted to a rear part of the nacelle wall.