| 摘要 |
The present invention relates to a device for reducing energy losses in a machinery unit ( 1 ), having at least one part ( 4 ) which is arranged to rotate in fluid about a rotation axis ( 6 ) in a substantially closed chamber ( 3 ) delimited in the radially outward direction by means of a wall ( 18 ) extending around the rotation axis. The wall ( 18 ) has a radially inward facing wall surface ( 10 ) extending wholly or partially around the revolution, which wall surface is highly smooth and extends close to, but with an interspace ( 14 ) to the radially outer surface which is generated around the revolution by the rotary part ( 4 ). The interspace is suited to minimizing the rotating fluid volume and, at the same time, maintaining necessary width for a boundary layer in the fluid between the generated surface and the wall surface. |
