Patent ID: 8845288
Filing Date: 2014-09-30
Classification: F01D,F05D

Abstract:
1. A turbine rotor assembly comprising: a turbine rotor; and a plurality of circumferentially spaced radially outwardly extending turbine rotor blades, the turbine rotor having a hub, a rim and a plurality of circumferentially spaced slots provided in the rim of the turbine rotor, each turbine rotor blade having a root, the root of each turbine rotor blade being arranged in a corresponding one of the slots in the rim of the turbine rotor, each turbine rotor blade being hollow, each turbine rotor blade being provided with at least one internal cooling passage for a coolant, each turbine rotor blade having at least one aperture arranged to supply coolant to the at least one internal cooling passage in the turbine blade, the at least one aperture being in a radially inner surface of the root, at least one of the slots having a thermally insulating material adjacent a radially inner surface of the slot wherein the thermally insulating material reduces the temperature gradient between a region of the turbine rotor adjacent the at least one slot and the hub of the rotor, a space being formed between the thermally insulating material and the radially inner surface of the root of the turbine rotor blade in the at least one of the slots to allow the coolant to be supplied to the at least one aperture.