Blade comprising a support, provided with a portion with a depression

Abstract

The support ( 6 ) of this blade comprises one side ( 7 ) and the other ( 18 ) provided with a depression ( 10 ). By concentrating this depression on a single side, a support ( 6 ) that is more rigid and resistant with an equal lightening is obtained, with the stress concentrations depending on the depth of the depression but being absent from the flat side ( 7 ). The vibrations and bending deformations are also reduced. Application to blades of a turbomachine, in particular compressors.

1 . Blade, in particular of a compressor, comprising a vane ( 1 ) and a foot ( 2 ), with the foot comprising successively, by moving away from the vane, a platform ( 4 ) joined to a support ( 6 ) and a bulb ( 5 ), with the support ( 6 ) comprising two main faces ( 7 ,  8 ) respectively directed in an intrados and an extrados side of the blade and parallel, characterised in that one of the main faces ( 7 ) is substantially plane or curvilinear, while the other of the main faces is provided with a portion with a depression ( 20 ) extending over a depth of at least 25% of a thickness of the support between the main faces. 
     
     
         2 . Blade according to  claim 1 , characterised in that the portion with a depression extends over at least 35% of the thickness of the support. 
     
     
         3 . Blade according to  claim 1 , characterised in that the portion with a depression has a bottom ( 12 ) that is substantially flat or curvilinear surrounded by a curved edge ( 14 ) that connects to the bottom without forming an angle. 
     
     
         4 . Blade according to  claim 2 , characterised in that the portion with a depression has a bottom ( 12 ) that is substantially flat or curvilinear surrounded by a curved edge ( 14 ) that connects to the bottom without forming an angle. 
     
     
         5 . Blade according to  claim 1 , characterised in that the portion with a depression is limited by rectilinear sides joined by curvilinear connectors.