HEAT SHIELD MANIFOLD SYSTEM FOR A MIDFRAME CASE OF A GAS TURBINE ENGINE

摘要

A heat shield manifold system for an inner casing between a compressor and turbine assembly is disclosed. The heat shield manifold system protects the outer case from high temperature compressor discharge air, thereby enabling the outer case extending between a compressor and a turbine assembly to be formed from less expensive materials than otherwise would be required. In addition, the heat shield manifold system may be configured such that compressor bleed air is passed from the compressor into the heat shield manifold system without passing through a conventional flange to flange joint that is susceptible to leakage.

主权项

1. A turbine engine, comprising:
at least one combustor positioned upstream from a rotor assembly, wherein the rotor assembly includes at least first and second rows of turbine blades extending radially outward from a rotor; a compressor positioned upstream from the at least one combustor; at least one row of turbine vanes extending radially inward and terminating proximate to the rotor assembly; a turbine airfoil cooling chamber in communication with turbine airfoils; an inner case extending from a downstream end region of the compressor to an upstream end region of the rotor assembly; and a heat shield wall positioned radially outward of the inner case and circumferentially encapsulating the inner case, thereby forming a heat shield manifold on an outer surface of the inner case; wherein the heat shield wall is in communication with a compressor bleed exhaust such that the compressor bleed exhaust supplies cooling fluid to the heat shield manifold and is in communication with a turbine airfoil cooling chamber such that the heat shield manifold supplies cooling fluid to the turbine airfoil cooling chamber.