| 摘要 |
A turbine blade (10) having such a profile that (A) a straight line (H) is drawn such that (a) said straight line passes a point of intersection (J) between an extension of a first straight line (F) which, together with a second straight line in parallel with the axis of a circular blade array, defines an inlet angle ( alpha 1) and an extension of a third straight line which, together with a fourth straight line in parallel with said axis, defines an outlet angle ( alpha 2), (b) said straight line (H) is in parallel with said axis, and (c) said straight line (H) is spaced apart from the outlet end of the blade (10) by a distance greater than one half of the chord length (C) thereof; and (B) that at the point of intersection (P) between said straight line (H) and the center line (A) of the flow passage between adjacent blades, said point being the flow direction changing point, the smallest width (Sp) of the flow passage is less than about 0.4 times the width (t) of said flow passage at the inlet thereof. |
