| 摘要 |
PROBLEM TO BE SOLVED: To suppress an increase of incident loss due to a deflection in the inflow direction (inlet angle) of a fluid flowing into a turbine rotor blade, and also to enhance turbine efficiency by making a front edge radius of a blade profile having large turning angle larger than that of blade profile having small turning angle. SOLUTION: In this turbine rotating a rotor by means of steam conducted by a stationary blade via rotor blade, with the change of a turning angle (ε) being composed of subtracting an inlet angleε1 and an outlet angleε2 to be formed in space between two tangents 10 and 11 of respective comber lines in both front and rear edge parts 9 and 10 and the rotational direction of a turbine rotor blade, from 180 degrees, a circuit front edge radius R forming the front edge part is varied. In brief, the front edge radius R of a blade profile having large turning angle (ε) is set up to be larger than the front edge radius R of the blade profile having small turning angle (ε). In addition, the ratio between a size of the front edge radius R and a span (d) of the blade root end is set up to be more than 0.012 in case of the blade profile where the size of the turning angle (ε) becomes maximized.
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