TURBINE FRAME ASSEMBLY AND METHOD OF DESIGNING TURBINE FRAME ASSEMBLY

摘要

A structural case assembly comprises a frame, fairing and heat shield. The frame is fabricated from a material having a temperature limit below an operating point of a gas turbine engine, and comprises an outer ring, an inner ring and a plurality of struts extending therebetween to define a flow path. The fairing is fabricated from a material having a temperature limit above the operating point of the gas turbine engine, and comprises a ring-strut-ring structure that lines the flow path. The heat shield is disposed between the frame and the fairing to inhibit radiant heat transfer therebetween. The heat shield may block all line-of-sight between the fairing and the frame. The frame may be produced from CA-6NM alloy. A method for designing a turbine case structure includes selecting a frame material having a temperature limit below the operating point of an engine.

主权项

1. A turbine exhaust case comprising:
a frame fabricated from a material having a temperature limit below an operating point of a gas turbine engine, the frame comprising:
an outer ring;an inner ring; anda plurality of struts joining the outer ring and the inner ring;a fairing fabricated from a material having a temperature limit above the operating point of the gas turbine engine, the fairing comprising a ring-strut-ring structure that lines the flow path; and a heat shield disposed between the frame and the fairing to inhibit radiant heat transfer between the frame and the fairing.