One-piece HPTR blade squealer tip

An improved rotor blade for a turbine engine which comprises:

• a. a hollow casting including means for mounting said blade to the rotor of said turbine, and a cast end wall at the radially outward end thereof, said casting having cambered side walls defining an interior chamber having an inlet thereof near said mounting means;
• b. a channel defined in the radially outwardly facing surface of said cast end wall and along a substantial portion of a chord of said blade, and an opening defined through said end wall and communicating with said channel, said opening comprising an outlet through said end wall for passage of coolant fluid through said blade;
• c. a tip end closure for said blade bonded to said end wall of said casting, said tip end closure comprising a base plate member of peripheral contour coincidental with that of said cambered side walls and a pair of tip side walls faired with said cambered side walls, said base plate member bonded to and cooperating with said outwardly facing surface of said cast end wall to define a first passageway along said channel, said base plate member having a plurality of radially outwardly opening second passageways therethrough and disposed along the chord thereof and communicating with said first passageway, said second passageways defined along axes inclined to said base plate and intersecting said side walls whereby said coolant fluid flowing therethrough is directed against a surface of said tip side walls.