INDUSTRIAL GAS TURBINE EXHAUST SYSTEM WITH AREA RULED EXHAUST PATH

摘要

An integrated single-piece exhaust system (SPEX) with modular construction that facilitates design changes for enhanced aerodynamics, structural integrity or serviceability. The SPEX defines splined or curved exhaust path surfaces, such as a series of cylindrical and frusto-conical sections that mimic curves. The constructed sections may include: (i) a tail cone assembly fabricated from conical sections that taper downstream to a reduced diameter; or (ii) an area-ruled cross section axially aligned with one or more rows of turbine struts; or both features. Modular inner and outer diameter inlet lips enhance transitional flow between the last row blades and the SPEX, as well as enhance structural integrity. Modular strut collars have large radius profiles between the SPEX annular inner diameter and outer diameter flow surfaces, for enhanced airflow and constant thickness walls for uniform heat transfer and thermal expansion. Scalloped mounting flanges enhance structural integrity and longevity.

主权项

1. An industrial gas turbine exhaust system, comprising:
a turbine exhaust case (TEC) adapted for coupling to a downstream end of a turbine section of an industrial gas turbine; an inner case coupled to the TEC; an outer case circumscribing the inner case in spaced relationship relative to a centerline defined by the exhaust system, coupled to the TEC; a turbine exhaust path defined between the outer and inner cases; and a plurality of struts interposed between the outer and inner cases that are tilted at an angle relative to a radius defined by the exhaust system centerline; and circumferential profile of at least one of the inner or outer cases forming an area ruled exhaust path cross section proximal the struts, in order to compensate for at least a portion of strut reduction in exhaust path cross section.