Turbine exhaust section structures with internal flow passages

摘要

A system is provided including a turbine exhaust section. The turbine exhaust section includes an exhaust flow path. The turbine exhaust section also includes an outer structure having an outer casing, an outer exhaust wall disposed along the exhaust flow path, and an outer cavity disposed between the outer exhaust wall and the outer casing. The turbine exhaust section further includes an inner structure having an inner exhaust wall disposed along the exhaust flow path, an inner cavity disposed between the inner exhaust wall and an inner casing, and a bearing cavity disposed between the inner casing and a bearing housing. In addition, the turbine exhaust section includes a strut extending between the outer structure and the inner structure. The strut includes a first flow passage configured to flow a fluid from the inner cavity to the outer cavity.

主权项

1. A system, comprising:
a turbine exhaust section, comprising:
an exhaust flow path;an outer structure comprising an outer casing, an outer exhaust wall disposed along the exhaust flow path, and an outer cavity disposed between the outer exhaust wall and the outer casing;an inner structure comprising an inner exhaust wall disposed along the exhaust flow path, an inner cavity disposed between the inner exhaust wall and an inner casing, and a bearing cavity disposed between the inner casing and a bearing housing;a strut extending between the outer structure and the inner structure, wherein the strut at least partially defines a first flow passage configured to flow a fluid from the inner cavity to the outer cavity;a second flow passage disposed at a downstream end portion of the turbine exhaust section downstream of the strut, wherein the second flow passage is configured to flow the fluid into the bearing cavity; andone or more tunable areas through the inner casing, wherein the one or more tunable areas are configured to control a flow of the fluid from the bearing cavity to the inner cavity.