US 11,885,239 B2
Turbomachine rotary fan blade, fan, and turbomachine provided therewith
Guillaume Pascal Jean-Charles Gondre, Moissy-Cramayel (FR); Thomas Alain De Gaillard, Moissy-Cramayel (FR); and Pierre Jean Faivre D'Arcier, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 17/776,103
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Nov. 18, 2020, PCT No. PCT/FR2020/052110
§ 371(c)(1), (2) Date May 11, 2022,
PCT Pub. No. WO2021/099736, PCT Pub. Date May 27, 2021.
Claims priority of application No. 1912933 (FR), filed on Nov. 20, 2019.
Prior Publication US 2022/0381148 A1, Dec. 1, 2022
Int. Cl. F01D 5/28 (2006.01); F01D 5/14 (2006.01)
CPC F01D 5/282 (2013.01) [F01D 5/147 (2013.01); F05D 2300/6034 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A blade for a turbomachine rotary fan, the blade comprising a body having an upstream edge and a downstream edge, between which the body, extends along a first longitudinal direction, an extrados and an intrados, between which the body extends along a second thickness direction, which is transverse to the first direction, a blade root and an upper blade tip edge, between which the body extends along a third height direction, transverse to the first longitudinal direction and to the second thickness directions, a function of the blade root being to be fixed to a longitudinal rotary fan hub,
the blade comprising a predetermined breaking zone, which extends from the upstream edge over a determined non-zero length along the first longitudinal direction and which extends from the upper blade tip edge over a determined non-zero height along the third height direction, wherein
the body is made of a composite material comprising a fiber reinforcement obtained by three-dimensional weaving of first warp strands extending at least along the third height direction and of weft strands extending at least along the first longitudinal direction, and a resin matrix in which the fiber reinforcement is embedded,
the first warp strands comprise second warp strands, which have at least one discontinuity in or in proximity to the predetermined breaking zone and which are configured so that the predetermined breaking zone is partially detached in the presence of tangential friction extending in the second thickness direction against the upper blade tip edge,
the determined non-zero height of the predetermined breaking zone being less than 3% of an aerodynamic stream height of the blade, defined from the upper blade tip edge to an aerodynamic stream starting point of the blade, which is located at a distance from the blade root and which is intended to be in contact with an inter-blade platform along the third height direction.