COOLING FOR TURBINE BLADE PLATFORM-AEROFOIL JOINT

摘要

PROBLEM TO BE SOLVED: To provide a turbine blade for a gas turbine for cooling a joint part between a platform part surface and an aerofoil surface.SOLUTION: A platform part 12 comprises a platform surface 16 arranged to be attached to a corresponding aerofoil surface 18 of an aerofoil part 14. The turbine blade 10 is further comprises a cooling duct 20 for cooling the platform surface and the aerofoil surface. The cooling duct 20 comprises at least one cavity 22 in the platform surface 16 and at least one cavity 24 in the corresponding aerofoil surface 18. The platform surface cavity and the aerofoil surface cavity are aligned such that when the platform surface 16 and the aerofoil surface 18 are in contact with each other, the cooling duct 20 remains open. This provides a reliable cooling means that cools both the platform surface and the aerofoil surface.SELECTED DRAWING: Figure 1