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ASME Press Select Proceedings

International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3

By
Yi Xie
Yi Xie
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ISBN:
9780791859810
No. of Pages:
906
Publisher:
ASME Press
Publication date:
2011

In this study, two shroud designs, parabolic and cone shape one, of a backward inclined (BI) commercial centrifugal fan, on performance was evaluated. The considered fan that is produced by Nicotra Company has diameter about 400mm and 11 blades. Whole device with inlet and outlet channel was numerically simulated in steady state, with two shroud shape. Results for parabolic shape were verified by performance curves obtained by experimental tests done by Nicotra. There is a separation region under shroud because of rapid flow direction changes, from axial direction in inlet to radial in entrance of impeller. Performance curves show that parabolic shape has better flow guidance than cone shape one especially in the impeller outlet, which results in reduction in flow losses due to recirculation from this region to inlet clearance. Because of this treatment pressure generation and efficiency are about 3 to 4% and almost 6.5% more respectively for parabolic shape.

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