| 摘要 |
PURPOSE:To reduce a side wall loss to be generated inside a cascade of stator blades, by arranging plural passages extending as far as the point between the rotor blade group inlet part and the stator blade group outlet part in a stage different part provided at the stator blade group inlet section. CONSTITUTION:A stage difference is provided for a diaphragm 3 at the stator blade inlet part while a through passage 7 extending as far as the point between a stator blade 1 outlet and a rotor blade 2 inlet from the stage different part is provided so as to suck up a boundary layer on top of the diaphragm 3 being developed up to the stator blade 1 inlet, through the passage 7. Due to this make- up, the boundary layer part is led into the space between the stator blade 1 outlet and the rotor blade 2 inlet via the through passage 7 and a flow coming into the stator blade 1 becomes almost uniform without boundary layer. Accordingly, the boundary layer which always used to cause the generation of secondary flow is only such one developed after being taken into a cascade of stator blades; the secondary flow is thus lessened. |
