| 摘要 |
In a diffuser arrangement for centrifugal compressors, a longitudinal center line of each passage is tangential to a reference tangent circle defined concentrically with respect to the impeller and having a smaller diameter than an outer diameter of the impeller so that a leading edge defined at an intersection between each pair of adjacent passages is brought close to an outer periphery of the impeller. Because the leading edge, in particular the side portions thereof, is brought close to the outer peripheral part of the impeller, the incidence mismatch can be minimized so that a blockage in the throat section of each passage can be avoided, and the static pressure can be recovered at a high efficiency. Also, when drilling the passages, protrusions are not formed in the inner peripheral part of the diffuser. Elimination of the need to remove such protrusions contributes to the reduction in the manufacturing cost.
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