| 摘要 |
A centrifugal compressor for a turbo-fan engine includes a shroud covering the edges of vanes of a compressor wheel mounted on an outer shaft with a clearance alpha left therebetween. A vertical section of the shroud includes an upstream portion extending in an axial direction, and a downstream portion curved radially outwards and extending from a downstream end of the upstream portion. The thickness of the downstream portion is increased gradually from the upstream side toward the downstream side. Thus, it is possible to prevent the variation of the clearance alpha defined along the downstream portion of the shroud which exerts a large influence on the compression performance, thereby suppressing the reduction in performance due to the thermal expansion of the shroud.
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