| 摘要 |
Movement of a fluid such as air is produced by rotating about a rotational axis (O-O) a plurality of flow generating plates (P, P1, P1a, P1b, P2, P3) arranged parallelly with clearances (CL) therebetween. The clearances (CL) between adjacent two flow generating plates for producing the movement of the fluid most effectively only by adhesion of the fluid to the flow generating plates, is set as follows. That is, the clearances (CL) are set to be twice a value (c) of a distance of an intermediate portion between the surface of the flow generating plate contacting a portion of the fluid in a close boundary layer which is rotated and moved substantially together with the flow generating plate and a remote fluid boundary layer which is substantially not influenced by centrifugal force due to the rotation of the flow generating plate. In the case of air, the clearances are about 0.5 mm. It is preferred to form the flow generating plate so as to have a waved surface for improving the flow generating efficiency.
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