US 12,264,637 B2
Propulsion system with downstream section having deformable shape-memory material and actuators extending in different consecutive angular sectors
Jean-Louis Robert Guy Besse, Moissy-Cramayel (FR); and Ye-Bonne Karina Maldonado, Moissy-Cramayel (FR)
Assigned to SAFRAN, Paris (FR); and SAFRAN HELICOPTER ENGINES, Bordes (FR)
Appl. No. 17/754,758
Filed by SAFRAN, Paris (FR); and SAFRAN HELICOPTER ENGINES, Bordes (FR)
PCT Filed Oct. 12, 2020, PCT No. PCT/FR2020/051799
§ 371(c)(1), (2) Date Apr. 11, 2022,
PCT Pub. No. WO2021/074515, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 1911538 (FR), filed on Oct. 16, 2019.
Prior Publication US 2024/0084761 A1, Mar. 14, 2024
Int. Cl. F02K 1/00 (2006.01); B64C 15/02 (2006.01)
CPC F02K 1/002 (2013.01) [B64C 15/02 (2013.01); F05D 2270/64 (2013.01); F05D 2270/65 (2013.01); F05D 2300/505 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A propulsion system for an aircraft, comprising:
at least one rotor and a nacelle fairing extending around said at least one rotor with respect to an axis of rotation of said rotor, the nacelle fairing comprising an upstream section forming an inlet cross-section of the nacelle fairing and a downstream section, a downstream end of which forms an outlet cross-section of the nacelle fairing; and
wherein the downstream section comprises a radially internal wall and a radially external wall made of a deformable shape-memory material and in that the downstream end forming the outlet cross-section comprises a plurality of pneumatic or hydraulic actuators, each actuator of the plurality of actuators being independently actuatable and extending in different consecutive angular sectors about said axis of rotation, and configured to deform in a direction which is radial with respect to the axis of rotation and which is angularly centered with respect to the angular sector over which each said actuator extends under a predetermined command pressure, and
wherein each actuator comprises a bladder in a general form of a toroidal segment of flexible material encased in a spiral spring.