Turbomachine rotor assembly

Abstract

A turbomachine rotor assembly comprising: a rotor disk ( 2 ) presenting slots ( 4 ) in its outer periphery; blades ( 14 ) fastened via their roots ( 16 ) in said slot ( 4 ); and shims ( 20 ) mounted between the blade roots ( 16 ) and the disk ( 2 ), each shim ( 20 ) comprising two branches ( 20 A) and a base part ( 20 B) interconnecting the branches, each branch ( 20 A) being disposed between the bearing surface ( 16 A) of a blade root ( 16 ) and the corresponding bearing surface ( 22 A) of the disk ( 2 ); each branch ( 20 A) being made of a first material presenting a first Young's modulus of value E, at any operating temperature in the operating temperature range of the shim ( 20 ). The rotor assembly includes pads ( 40 ) adhering to the bearing surfaces ( 22 A) of the disk and/or to the bearing surfaces ( 16 A) of the blade root, the pads ( 40 ) being made of a second material presenting a second Young's modulus of value lying in the range E/20 to E/5 at said operating temperature.

1 . A turbomachine rotor assembly comprising: a rotor disk presenting slots in its outer periphery; blades fastened via their roots in said slots; and shims mounted between the blade roots and the disk, each shim comprising two branches and a base part interconnecting the branches, each branch being disposed between the bearing surface of a blade root and the corresponding bearing surface of the disk; each branch being made of a first material presenting a first Young's modulus of value E, at any operating temperature in the operating temperature range of the shim, said rotor assembly including pads adhering to the bearing surfaces of the disk and/or to the bearing surfaces of the blade root, the pads being made of a second material presenting a second Young's modulus of value lying in the range E/20 to E/5 at said operating temperature. 
     
     
         2 . A rotor assembly according to  claim 1 , in which said first material is a metal alloy or an organic matrix composite material, while said second material is non-metallic. 
     
     
         3 . A rotor assembly according to  claim 1 , in which said second material has viscoelastic behavior in the operating temperature range of the shim. 
     
     
         4 . A rotor assembly according to  claim 1 , in which the base part of each shim extends under a respective blade root. 
     
     
         5 . A rotor assembly according to  claim 1 , in which the base part of each shim extends over the outer periphery of the disk between two adjacent slots. 
     
     
         6 . A turbomachine including a rotor assembly according to  claim 1 .