An aircraft propulsion system including a bypass turbojet engine surrounded by a nacelle together with a mechanism attaching the engine to a pylon of an aircraft. The nacelle includes an inner structure forming a body of revolution including a rigid framework formed by an upstream annular frame fast
An aircraft propulsion system including a bypass turbojet engine surrounded by a nacelle together with a mechanism attaching the engine to a pylon of an aircraft. The nacelle includes an inner structure forming a body of revolution including a rigid framework formed by an upstream annular frame fastened to an intermediate casing of the engine, a downstream annular frame supporting the exhaust casing of the engine, and longitudinal arms connecting the frames together, the annular downstream frame being fastened to the pylon by a flexible or hinged suspension mechanism.
대표청구항▼
1. An aircraft propulsion system comprising: a bypass turbojet engine surrounded by a nacelle defining an annular flow space for a secondary stream; andmeans for attaching the engine to a pylon for fastening to a structural element of an aircraft,wherein a downstream portion of the nacelle comprises
1. An aircraft propulsion system comprising: a bypass turbojet engine surrounded by a nacelle defining an annular flow space for a secondary stream; andmeans for attaching the engine to a pylon for fastening to a structural element of an aircraft,wherein a downstream portion of the nacelle comprises an inner structure forming a body of revolution that surrounds an annular wall defining an outer boundary of an annular flow space for a primary stream, that extends axially between an annular intermediate casing of the engine and an annular exhaust casing of the engine defining an outer boundary of an outlet of the primary stream, and that defines an inside of a flow section for the secondary stream around a body of the engine,wherein the inner structure of the downstream portion of the nacelle comprises a rigid framework including an upstream annular frame fastened by bolting to the intermediate casing of the engine, a downstream annular frame that surrounds the exhaust casing of the engine and that includes support means for supporting the exhaust casing of the engine, and longitudinal arms connecting the upstream and downstream frames together, andwherein the annular downstream frame of the inner structure is fastened to the pylon by flexible or hinged suspension means. 2. A propulsion system according to claim 1, wherein the exhaust casing support means comprises links regularly distributed around an axis of the engine having their radially inner ends hinged via ball joints to a rigid cylindrical wall of the exhaust casing, and their radially outer ends hinged via ball joints to the downstream annular frame of the inner structure of the nacelle. 3. A propulsion system according to claim 2, wherein the links extend substantially tangentially to the exhaust casing and in a plane perpendicular to the axis of the engine. 4. A propulsion system according to claim 1, wherein the suspension means for suspending the downstream annular frame comprises links hinged via ball joints and connecting the pylon to a top portion of the downstream frame, together with a thrust take-up connecting rod. 5. A propulsion system according to claim 4, wherein the downstream annular frame comprises a channel-section ring forming an annular channel that is open radially outwards and that includes hinge means for the suspension links. 6. A propulsion system according to claim 4, wherein the suspension links comprise a three-point link of L-shape including one end of a long branch hinged via a ball joint to the downstream annular frame, and including one end of a short branch hinged to one end of another link whose other end is hinged by a ball joint to the downstream annular frame. 7. A propulsion system according to claim 4, wherein the thrust take-up connecting rod is oriented axially downstream from the top portion of the downstream frame. 8. A propulsion system according to claim 1, wherein the pylon includes an upstream portion extending up to the intermediate casing of the engine and connected by three links that are hinged to a top portion of the intermediate casing, two of the links extending substantially radially, while a third link extends substantially tangentially to the intermediate casing. 9. A propulsion system according to claim 1, wherein the upstream and downstream annular frames of the inner structure of the nacelle are connected together by two of the longitudinal arms within a vertical plane with respect to an axis of the engine and extending substantially along the axis of the engine, and by two of the longitudinal arms in within a horizontal plane with respect to the axis of the engine and extending substantially along the axis of the engine. 10. A propulsion system according to claim 1, wherein fairing panels are fastened to the framework of the inner structure of the nacelle and include substantially longitudinal rigid walls for guiding the secondary stream around the pylon, these walls including flexible means connecting them to the pylon. 11. A propulsion system according to claim 10, wherein the fairing panels comprise substantially longitudinal walls extending in a portion of the flow space for the secondary stream that is diametrically opposite from the pylon to guide the secondary stream around services for the engine. 12. A propulsion system according to claim 10, wherein the upstream annular frame and the fairing panels of the inner structure of the nacelle are made of titanium. 13. A propulsion system according to claim 10, wherein at least some of the elements selected from access hatches of the fairing panels, the upstream annular frame, the longitudinal arms, and the fairing panels are made of composite material. 14. A propulsion system according to claim 1, wherein the downstream annular frame and at least some of the longitudinal arms of the inner structure of the nacelle are made of an alloy including nickel. 15. A propulsion system according to claim 1, wherein the nacelle further comprises an outer jacket including two semicylindrical shells which are hinged to the pylon, the outer jacking defining an outside of the flow section for the secondary stream around the body of the engine. 16. A propulsion system according to claim 15, wherein the outer jacket is fastened to an outer wall of the intermediate casing and the inner structure of the downstream portion of the nacelle extends from an inner cylindrical wall of the intermediate casing, the inner cylindrical wall of the intermediate casing being connected to the outer wall of the intermediate casing by stator vanes.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.