Patent ID: 9062559
Filing Date: 2015-06-23
Classification: F01D,F04D,F05D

Abstract:
1. In a gas turbine engine having a structure defining an annular flow path for receiving exhaust gas from a turbine section, the structure having a diffuser including an inner wall and an outer wall, and a casing for housing the structure, a strut cover located downstream from a last row of blades of the turbine section, the strut cover extending radially through the flow path between the inner wall and the outer wall wherein a strut extends through the strut cover from a location adjacent to the inner wall to a location adjacent to the outer wall, the strut cover including: an upstream section defining a leading edge for the strut cover and including a downstream end, a pressure side wall, a suction side wall, and at least one flow channel extending from the pressure side wall to the suction side wall for transferring a portion of the exhaust gases passing through the flow path from the pressure side wall to the suction side wall, wherein the at least one flow channel includes: the upstream section being supported on a pivot axis for pivotal movement about the pivot axis and wherein the upstream section is pivotally movable to orient a chordal axis of the upstream section to angles relative to a central axis of the engine that generally match an angle of incidence of gases flowing from the last row of blades of the turbine section; a downstream section defining a trailing edge for the strut cover, the strut extending through the downstream section, and including an outer edge and an upstream end positioned adjacent to the downstream end of the upstream section, the downstream section being stationary relative to the inner and outer walls to define a predetermined flow angle for directing exhaust gases flowing from the upstream section and passing through the diffuser; wherein the upstream section includes side walls that diverge in a direction extending from the leading edge, and the downstream section includes side walls that converge in a direction extending toward the trailing edge; and the upstream section has at least two positions, one in which the outlet opening of the passage is located adjacent to the outer edge of the downstream section and a second position wherein the flow is directed in a tangential direction along the suction side.