| 摘要 |
<p>A centrifugal turbomachinery capable of preventing an excessive increase in the manufacturing cost, adapted to effectively reduce a secondary flow in a vane wheel flow passage and reduce a loss, which is ascribed to the secondary flow, to a minimum level, and having a high efficiency, comprising a vane wheel provided with a plurality of vanes (3) between a central inlet (6a) and an outer circumferential outlet (6b), and a flow passage formed between these vanes and used to send a fluid from the inlet to the outlet by the rotation of the vane wheel, the portions of the vanes (3) which are on the side of a hub (2) having a circumferential inclination preceding in the rotational direction of the vane wheel with respect to the portions of the vanes which are on the side of a shroud (4), the angle of inclination of the vanes which is defined as an angle of the vanes formed in a plane viewed from the outlet of the flow passage with respect to a plane perpendicular to a hub surface having a tendency to decrease from the inlet toward the outlet, whereby the center lines of a shroud-side portion and a hub-side portion viewed from a front part of a vane inlet cross each other in a position where a ratio of dimensionless radius to a radius of the outlet is 0.8-0.95.</p> |
