| 摘要 |
An axial flow fan for reducing noise caused by air-flow has parameters satifying following conditions that BR=0.15-0.2 DT, DB=1.01-1.05 DT, lx=0-0.04 DT where BR; half radius of curved edge of the outer frame, DT; outer radius of the fan DB; inner radius of the bell mouth, lx; distance between back part of the outer wing of the fan and the end part of the duct.
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