Turbine blade with tip brush seal

Abstract

A turbine rotor blade with a brush seal formed between the blade tip and an outer shroud to form a seal for a blade outer air seal. The brush seal includes fibers made from a high temperature resistant material that has long wear life such as fibers of alumina-boria-silicate in order to withstand the temperature environment of a turbine rotor blade and to provide long life due to rubbing of the brush fibers on the relatively rotating brush seal surface.

1 . A turbine rotor blade comprising:
 an airfoil extending from a root and platform;   a blade tip formed on the outer end of the airfoil;   a brush seal extending from the blade tip; and,   the brush seal is made of fibers of alumina-boria-silicate.   
     
     
         2 . The turbine rotor blade of  claim 1 , and further comprising:
 the fibers are wrapped around a piece of the blade tip to form a U-shaped arrangement of fibers.   
     
     
         3 . The turbine rotor blade of  claim 1 , and further comprising:
 the brush seal includes a pressure side brush seal and a suction side brush seal.   
     
     
         4 . The turbine rotor blade of  claim 3 , and further comprising:
 the pressure side brush seal and the suction side brush seal both wrap around a piece of the blade tip to form a U-shaped arrangement of fibers.   
     
     
         5 . A blade outer air seal for a turbine rotor blade comprising:
 an outer shroud with an inner surface that forms a seal with a blade tip;   a turbine rotor blade having a blade tip;   a brush seal extending from one of the outer shroud or the blade tip to form a seal between the blade tip and the outer shroud; and,   the brush seal is made of fibers of alumina-boria-silicate.   
     
     
         6 . The blade outer air seal of  claim 5 , and further comprising:
 the brush seal is fixed to the blade tip and rotates along with the turbine rotor blade.   
     
     
         7 . The blade outer air seal of  claim 5 , and further comprising:
 the brush seal is fixed to the outer shroud and is fixed to the outer shroud.   
     
     
         8 . The blade outer air seal of  claim 6 , and further comprising:
 the brush seal fibers are wrapped around a piece of the blade tip to form a U-shaped arrangement of fibers.   
     
     
         9 . The blade outer air seal of  claim 8 , and further comprising:
 the brush seal includes a pressure side brush seal and a suction side brush seal.