| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow passage structure and gas turbine exhaust diffuser that inhibits occurrences of pressure losses.SOLUTION: There is provided a flow passage structure in which structures 12, 13 extend in a direction intersecting a main flow direction along a main flow of a fluid E flowing through a passage P from wall surfaces 10b, 11b that forms the flow passage P, and the structures 12, 13 occupy a partial range of the flow passage P in a flow passage cross section intersecting the main flow, and thus the cross-sectional area of the flow passage P changes with the movement in the main direction. The flow passage structure has recessed part forming regions 20, 30 in which recessed parts 21, 22, 31, 32 are formed in the wall surfaces 10b, 11b over a range including the structures 12, 13 in the main direction. |
