| 摘要 |
PROBLEM TO BE SOLVED: To provide an impeller of a centrifugal compressor improved so that a surge characteristic is enhanced without increasing stress at a hub side in a blade and a loss can be further reduced. SOLUTION: An increase ratio of a thickness regarding a radial direction of at least a part of a blade in the impeller of the centrifugal compressor is gradually increased only at a negative pressure surface side as it approaches to a base end. Thereby, since a cross section of a passage can be reduced without increasing the stress near the hub, a load of the neighborhood to the hub is locally reduced and the surge characteristic is enhanced. Winding up of a secondary flow is reduced and the loss can be reduced. COPYRIGHT: (C)2004,JPO
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