Centrifugal compressor and vaned diffuser

摘要

A centrifugal compressor comprises a centrifugal impeller (2) and a vaned diffuser (7). The diffuser (7) includes a pair of diffuser plates (3,4) and a plurality of guide vanes (5,6) arranged between the pair of diffuser plates (3,4) in a circular cascade manner. The guide vanes (5,6) are equal in leading-edge radius to each other, but are different in length from each other. At least one short guide vane (6) is arranged between the adjacent long guide vanes (5). The total number of the guide vanes (5,6) is more than the number of blades (13) of the impeller (2). A throat (10) is formed in only a part of flow passages between the guide vanes (5,6).