| 摘要 |
PROBLEM TO BE SOLVED: To provide a system including an airfoil part (100) of an unshrouded turbine bucket. SOLUTION: The airfoil part (100) includes a pressure-side surface (102) and suction-side surface (104, 210) each extending from a root surface (106) to a tip surface (108) and joined at a leading edge (110) and a trailing edge (112). The pressure-side surface (102) has a substantially concave shape and the suction-side surface (104, 210) having a substantially convex shape. The airfoil part (100) has an increasing stagger angle in a span-wise direction from the root surface (106) to the tip surface (108) and an increasingly loaded suction-side surface (104) as the suction-side surface (104) approaches the tip surface (108) and the tip surface (108) approaches the leading edge (110). The airfoil part (100) has a resultant lean in a direction of the suction-side surface (104) as the leading edge (110) approaches the tip surface (108). The pressure-side surface (102) and the suction-side surface (104) each has a locally reduced or reversed curvature in a direction of the pressure-side surface (102) at their intersection with the tip surface (108). COPYRIGHT: (C)2010,JPO&INPIT |
