| abstract |
The invention provides a turbine blade tip cooling system including a tip rail cooling insert. A turbine blade tip cooling system (200) is provided that includes a turbine blade (115) having a tip cavity (155), a tip rail (150) surrounding at least a portion of the tip cavity (155), and at least one internal cooling cavity. The tip rail (150) has an inner rail surface (157), an outer rail surface (159), an end face (160, 288), and at least one tip rail pocket (270) that opens at the end face (160, 288) and is fluidly connected to at least one internal cooling cavity carrying a coolant. A tip rail cooling insert (280) is attached to the at least one tip rail pocket (270) and has one or more insert cooling channels (180) and a coolant collection plenum (284,384) for directing coolant from the at least one internal cooling cavity to the one or more insert cooling channels (180). |