| 摘要 |
A blade of a rotor of a second stage of a compressor can be defined by coordinates of a discreet combination of points, in a Cartesian reference system (X, Y, Z), where the axis (Z) is a radial axis intersecting the central axis of the compressor. The blade has a profile which can be identified by a series of closed intersection curves between the profile itself and planes (X, Y) lying at distances (Z) from the central axis. The blade also has a non-linearly variable trend of decreasing maximum thickness defined by the closed curves, substantially parallel to a base portion of the blade itself, fixable to the rotor. The variable trend of maximum thickness is substantially situated midway up the blade and is suitable for shifting the natural resonance frequencies of the blade itself outside a functioning velocity range of the rotor.
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