Step seal, seal structure, turbomachine, and step seal manufacturing method

摘要

There are provided a step seal, a seal structure, a turbo machine, and a method for manufacturing a step seal. The step seal suppresses leak of a fluid from a gap between a first structure and a second structure and is formed on the first structure so as to have a clearance between the step seal and a seal fin formed on the second structure. The first structure and the second structure face each other in a radius direction with the gap inbetween and rotate around an axis line relative to each other. The step seal includes: a step seal body having a step face facing an upstream side of a flow direction of the fluid and an opposed face facing the second structure; and a protrusion formed between the step face and the opposed face.