| 摘要 |
<p>Each turbine blade (9) of a spindle system is provided with a front surface (21) which is oriented toward a front in the rotational direction and a rear surface (22) which is oriented toward a rear and receives gas. The rear surface (22) is a recessed columnar surface which has a radius of curvature R1, while the front surface (21) is a smooth continuous surface comprised of a projecting columnar surface (21a) which has a radius of curvature R2 larger than R1 and a flat surface (21c) between which a projecting columnar surface (21b) which has a radius of curvature R3 larger than R1 is arranged. Among the three surfaces forming the front surface (21), the projecting columnar surface (21a) is arranged at the inlet side of the channel straddling the projecting columnar surface (21b), while the flat surface (21c) is arranged at the outlet side of the channel. A space which is sandwiched between a facing front surface (21) and rear surface (22) of adjoining turbine blades (9) forms a channel of gas, and gas which is ejected from a nozzle (10) flows in from an inlet (31) of the channel, flows in a direction along the arc-shaped curve of the recessed columnar surface, and flows out from an outlet (32).</p> |
