| 摘要 |
A turbine blade (1) has a profile including a blade suction side line (2), a blade pressure side line (3), and a blade trailing edge (5) positioned between the rear ends of the blade suction side and pressure side lines (2, 3), wherein the blade trailing edge (5) of the profile is formed by connecting a pressure side arc-like curve (11) having a constant radius of curvature and extending from the rear end of the blade pressure side line (3) toward the camber line (CL) of the profile, and a suction side line portion (12) which extends from the rear end of the blade suction side line (2) toward the camber line (CL) while passing through a region closer to the camber line (CL) than a symmetric curve portion which is line-symmetric to the pressure side arc-like curve (11) with respect to the camber line (CL), the suction side line portion (12) being represented by curves constituting ellipses (12a, 12c) which constitute ellipses, and a straight line (12b). It is therefore possible to ensure satisfactory strength without entailing increase in blade weight or undesirable influence on structural design, and also to further improve performance by reducing velocity distribution defects attributable to wake flows from the trailing edge. |
