Patent ID: 7625181
Filing Date: 2009-12-01
Classification: F01D,Y10S

Abstract:
1. A turbine blade cascade structure comprising: a plurality of blades having respective blade bodies and provided in series on a wall surface in a circumferential direction, the wall surface connecting the blade bodies so that connected portions of the wall surface and blade bodies form corner portions, respectively; and a cover portion disposed only at a portion near a front edge portion of each of the blade bodies corresponding to a flow of a working fluid in the corner portions formed to the connected portion, extending to an upstream side of the flow of the working fluid and formed as a protruded portion having a concave curved surface toward a height direction of the front edge portion of the blade body from a base portion on the upstream side of the flow of the working fluid, wherein the protruded portion having the concave curved surface is formed to establish relationships of L