| 摘要 |
PROBLEM TO BE SOLVED: To suppress incurring of a cascade back separation loss and to improve performance of an axial flow turbine. SOLUTION: The cascade (a moving blade and a stationary blade) of an axial flow turbine consists of an inlet cascade 11 on the upstream side and an outlet cascade 12 on the wake side. The two blades 11 and 12 are situated to form an overlap region in an axial direction such that the front edge 14 of the outlet cascade 12 is positioned on the upstream side of the rear edge 13 of the inlet cascade 11. A wake 6 generated at the inlet cascade on the upstream side approaches an increased flow 8 occurs between the wake 6 and an inlet cascade back 15, Turning of a flow is decreased compared with a conventional one by the curve of the inlet cascade back 15 and the flow passes through the cascade 11 without the occurrence of separation at the back 15 and is confluent to a flow from an inlet cascade belly 16 and flows through the cascade 12.
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