Vane axial fan (upstream guide vanes — USGV)
This is an axial fan with guide vanes upstream of the impeller. Pre-rotation of the air in the opposite direction to the impeller rotation means that lift forces, and hence the fan pressure are increased. The impeller removing the swirl pressure development can be higher than the corresponding DSGV fan albeit with a narrowing of the flow range. (See Figures 1.82 and 1.83).
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Figure 1.82 Vane axial fan — (USGV upstream guide vanes) |
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Fan lanwa im) йt INLET VOLUME • C F M ■— ■■ I» fatal IMoanct mm |
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NMINP IJt 171 10 |
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97 «I M |
A — Ot^tOOn »• ft’ U*. I’M D«iw|a KIOOO C*M VU. Ow* >0 OOO C»M ] ■ »VWG
Figure 1.83 Vane axial fan — (USGV) — typical characteristic curves
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