TURBINE

摘要

The present invention provides a turbine which is equipped with blades and a structure for rotating relative to the blades and in which fluid is circulated. The turbine is equipped with: stepped parts provided to either end sections of the blades in the radial direction or areas of the structure which oppose the end sections of the blades in the radial direction; seal fins which extend from one direction towards the stepped parts and which are disposed such that minute gaps are formed between the stepped parts and the seal fins; a flow collision surface which is provided to a side upstream from the seal fins in the circulation direction of the fluid and into which the fluid collides; a protruding part which protrudes from the flow collision surface in the upstream side direction; and an opposing surface which opposes the flow collision surface.