US 12,441,460 B2
Blade for an unducted fan of a turbomachine
Matthieu Pierre Michel Dubosc, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 18/713,904
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Nov. 29, 2022, PCT No. PCT/FR2022/052189
§ 371(c)(1), (2) Date May 28, 2024,
PCT Pub. No. WO2023/094784, PCT Pub. Date Jun. 1, 2023.
Claims priority of application No. 2112684 (FR), filed on Nov. 29, 2021.
Prior Publication US 2025/0033760 A1, Jan. 30, 2025
Int. Cl. F01D 5/14 (2006.01); B64C 11/18 (2006.01)
CPC B64C 11/18 (2013.01) [F01D 5/147 (2013.01); F01D 5/141 (2013.01); F05D 2240/303 (2013.01); F05D 2240/304 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A blade for an unducted fan of a turbomachine, the turbomachine extending around a longitudinal axis, the blade comprising an airfoil with an aerodynamic profile having a leading edge and a trailing edge, the airfoil being formed of a plurality of airfoil sections stacked along an airfoil axis from a radially inner end to a radially outer end of the airfoil, an airfoil height corresponding to a distance along the airfoil axis from the radially inner end to the radially outer end of the airfoil,
wherein each airfoil section comprises a leading edge sweep corresponding to an angle between the airfoil axis and a median segment of the leading edge within said airfoil section,
wherein each airfoil section comprises a trailing edge sweep corresponding to an angle between the airfoil axis and a median segment of the trailing edge within said airfoil section,
wherein a sweep difference of an airfoil section is defined as a difference between the leading edge sweep and the trailing edge sweep, and
wherein the sweep difference of an airfoil section is:
less than 0° and greater than −30°, when the airfoil section has a height comprised between 10% and 30% of the airfoil height, and
greater than 0° and less than +40°, when the airfoil section has a height comprised between 50% and 90% of the airfoil height,
and wherein the sweep difference changes sign between two airfoil sections each having a height comprised between 30% and 40% of the airfoil height.