Cooling system for the rear bearing assembly of a turbine rotor

摘要

Assemblies for cooling an aft bearing assembly (238, 338) mounted to a rotor (202, 302) are provided. An assembly includes a static aft bearing structure (240, 340) configured to surround the aft bearing assembly (238, 338) and including a cylindrical section (250) defining a cavity for disposal of the aft bearing assembly (238, 338), a plurality of hollow struts (254, 354, 356, 358) extending from the static aft bearing structure (240, 340), each hollow strut including an outer radial end (276) configured to receive a gas from an air source and to provide a pathway (270) for the gas to flow into the cavity, and a center-body cap (282) disposed over an end of the static aft bearing structure (240, 340), the center-body cap (282) including a rim (286) configured to create a low pressure region at an interface between the static aft bearing structure (240, 340) and the center-body cap (282), wherein the low pressure region has a pressure that is lower than a pressure within the cavity.