Patent ID: 6056508
Filing Date: 2000-05-02
Classification: F01D,F05D

Abstract:
In a cooling system for a hollow gas turbine blade of the type having a blade root and a blade tip, the blade having a suction side wall and a pressure side wall joined together to form a trailing edge, the blade also having a web extending between the suction side wall and the pressure side wall, the side walls and the web forming a duct through which fluid may be conducted to cool the blade, the improvement comprising a plurality of ribs projecting into the duct from the pressure side wall and a plurality of ribs projecting into the duct from the suction side wall, the ribs extending obliquely to the web, the suction side wall ribs being offset relative to the pressure side wall ribs, the height of the projection of the ribs from the side walls increases from the trailing edge toward the web and the height of the ribs decreases adjacent the web, whereby when a cooling fluid is conducted through the duct, the cooling fluid flows substantially undisturbed along the web and the ribs cause the fluid to flow effectively toward the trailing edge.