Abstract: A gas turbine engine (100) variable nozzle (460) includes an outer shroud (461), an inner shroud (462), a variable nozzle airfoil (463), and a position selector (470). The inner shroud (462) is located radially inward from the outer shroud (461). The variable nozzle airfoil (463) extends radially between the outer shroud (461) and the inner shroud (462). The variable nozzle airfoil (463) includes a vane shaft (464) extending radially outward from the variable nozzle airfoil (463) through the outer shroud (461). The position selector (470) is coupled with the variable nozzle airfoil (463) to fixedly lock the variable nozzle airfoil (463) into one of a plurality of preselected positions.

Abstract: An exhaust diffuser for a gas turbine engine includes a diffuser inlet, a diffuser exit, an inner diffuser wall, and an outer diffuser wall. The inner diffuser wall may include a first tubular member with a flared downstream portion. The outer diffuser wall may include a second tubular member at least partially about the inner diffuser wall and with a second flared downstream portion. The outer diffuser wall and the inner diffuser wall extend between the diffuser inlet and the diffuser exit, and form a diffusing flowpath therebetween. The second flared downstream portion may include a lower section and an upper section, with the upper section extending further downstream in an axial direction than the lower section, relative to the diffuser axis.

Abstract: A gas-turbine engine (100) variable nozzle (460) includes an outer shroud (461), an inner shroud (462), and a variable nozzle airfoil (463). The outer shroud (461) includes a first spherical surface (466), a radially inner surface of the outer shroud (461). The inner shroud (462) includes a second spherical surface (467), a radially outer surface of the inner shroud (462). The variable nozzle airfoil (463) includes an outer edge (468) adjacent to the first spherical surface (466) and an inner edge (469) adjacent to the second spherical surface (467). The outer edge (468) has a curve which matches the contour of the first spherical surface (466). The inner edge (469) has a curve which matches the contour of the second spherical surface (467).