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Research Papers

Effects of Compact Radial-Vaned Air Separators on Stalling Characteristics of an Axial-Flow Fan

[+] Author and Article Information
Nobuyuki Yamaguchi, Masayuki Ogata

 Meisei University, 2-1-1 Hodokubo, Hino-shi, Tokyo 191-8506, Japan

Yohei Kato

 Japan Filter Technology, Ltd., I-1-1 Aza Sugise, Tsuhata-machi, Kawakita-gun, Ishikawa Prefecture 929-0454, Japan

J. Turbomach 132(2), 021009 (Jan 12, 2010) (8 pages) doi:10.1115/1.3104613 History: Received September 05, 2008; Revised November 27, 2008; Published January 12, 2010; Online January 12, 2010

The stall-prevention effect of air separators incorporating radial vanes in place of the existing axial vanes was investigated on a low-speed, single-stage, lightly loaded axial-flow fan for effective and compact air separators of a simplified structure. From the survey, paying attention to several geometrical dimensions of the device, the following conclusions are obtained: (1) Simplified radial vanes made of flat plates could show strong stall-prevention effect comparable to those of the curved-vane type one. The most favorable ones showed no stall up to the fan shut-off conditions. (2) Radial heights of the recirculation passage within the air separator showed significant influences on the stall improvement. It should be larger than some critical size experimentally given in the study. (3) The axial length of the device should be larger than some critical size given experimentally in the study. Too much reduced axial length could give rise to an abrupt loss in the effect. (4) The optimum axial locations of the rotor-tip blade leading edge within the device inlet opening were found to lie near the center of the width of the inlet opening from both aspects of stall improvement and fan efficiency.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Dimensions of the studied air separator and the fan

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Figure 2

Configuration of radial vanes for air separator Type A (W=33 mm)

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Figure 3

Configuration of radial vanes for air separator Type B (W=33 mm)

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Figure 4

Configuration of radial vanes for air separator Type C (W=33 mm)

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Figure 5

Configuration of radial vanes for air separator Type D (W=11 mm)

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Figure 6

Comparison of the effects of air separators of Types A–D together with the solid wall conditions on the fan characteristics

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Figure 7

Configuration of radial vanes for Type 10 air separator (W=10 mm)

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Figure 8

Configuration of radial vanes for Type 5 air separator (W=5 mm)

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Figure 9

Effects of relative locations of air separators Type A, Type 10, and Type 5 on the stalling flow coefficients and the peak efficiencies

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Figure 10

Fan characteristics affected by the application of air separators Type 10 for S=20 mm and variable sizes of C

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Figure 11

Fan characteristics affected by the application of air separators Type 10 for C=20 mm and variable sizes of S

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Figure 12

Effects of opening widths of the inlet and the exit of air separator Type 10 on the stall improvement index Bs

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Figure 13

Effects of opening widths of the inlet and the exit of air separator Type 5 on the stall improvement index Bs

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Figure 14

Achieved maximum stall improvement indices Bs max for air separator passage height W

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Figure 15

Tendency of stall improvement indices Bs achievable for given axial widths of air separator openings (C+S)

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Figure 16

Favorable range of g/S for stall improvement affected by the air separator passage height W for respective maximum widths of inlet and exit openings

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Figure 17

Comparison of overall performances optimally improved by the applied air separators

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