Patent ID: 8221081
Filing Date: 2012-07-17
Classification: B64C,Y02T

Abstract:
1. A turbomachine comprising: two unducted external fans mounted to contrarotate about a common axis, the fans constituting respectively an upstream fan and a downstream fan, wherein at least some of the blades of the upstream fan carry air guide means on radially outer end portions thereof, the air guide means being outwardly oriented on going from upstream to downstream and serving to deflect vortices that are formed in the vicinity of blade tips of the upstream fan radially to outside the blades of the downstream fan, wherein the air guide means of the blade includes at least one fin projecting from a suction side of the blade and/or at least one fin projecting from a pressure side of the blade, and wherein an axial length of each fin is less than an axial length of the blade and each fin is rectilinear.