| 摘要 |
A pipe diffuser is formed from a disc by initially drilling a plurality of circumferentially spaced, generally radially extending passages, but not to the point of any substantial intersection between the adjacent passages. Material is then removed by forming a circumferential groove on the inner periphery of the disc to the radial extent of a leading edge circle defined by the leading edges of the islands between the passages. The radial cross-sectional shape of the circumferential groove can be rectangular in form, in which case that space becomes fully vaneless, or it may be arcuate in form, in which case the space will be semi-vaneless. A preferred shape is one in which the groove is semi-elliptical in form so as to provide a structure that is substantially equivalent to the prior art structure while being easier to manufacture.
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