0
Research Papers

Improvement of Stalling Characteristics of an Axial-Flow Fan by Radial-Vaned Air-Separators

[+] 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), 021015 (Jan 13, 2010) (10 pages) doi:10.1115/1.3104612 History: Received September 05, 2008; Revised November 27, 2008; Published January 13, 2010; Online January 13, 2010

An improved construction of air-separator device, which has radial-vanes embedded within its inlet circumferential opening with their leading-edges facing the moving tips of the fan rotor-blades so as to scoop the tip flow, was investigated with respect to the stall-prevention effect on a low-speed, single-stage, lightly loaded, axial-flow fan. Stall-prevention effects by the separator layout, relative location of the separator to the rotor-blades, and widths of the openings of the air-separator inlet and exit were parametrically surveyed. As far as the particular fan is concerned, the device together with the best relative location has proved to be able to eliminate effectively the stall zone having existed in the original solid-wall characteristics, which has confirmed the promising potential of the device. Guidelines were obtained from the data for optimizing relative locations of the device to the rotor-blades, maximizing the stall-prevention effect of the device, and minimizing the axial size of the device for a required stall-prevention effect, at least for the particular fan and possibly for fans of similar light-load fans. The data suggest the changing internal flow conditions affected by the device conditions.

FIGURES IN THIS ARTICLE
<>
Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

The rotor mounted together with the air-separator device

Grahic Jump Location
Figure 2

The exit guide-vanes and the driving electric motor

Grahic Jump Location
Figure 3

Test facility of the fan

Grahic Jump Location
Figure 4

Original dimensions of the studied fan and the air-separator device

Grahic Jump Location
Figure 5

Rectifying radial-vanes of air-separator Type A

Grahic Jump Location
Figure 6

Fan performance characteristics in the solid-wall condition and reference points

Grahic Jump Location
Figure 7

Comparison of fan performances for conditions with the best air-separator (Type A, S=37.5 mm, C=30 mm, W=33 mm, and g=22.4 mm) and for the conditions with the solid wall

Grahic Jump Location
Figure 8

Variable dimensions of the studied air-separator

Grahic Jump Location
Figure 9

Comparison of fan performances by air-separator Type A for various relative locations g/Za (S=37.5 mm, C=30 mm, W=33 mm, and b=25 mm)

Grahic Jump Location
Figure 10

Effects of relative locations of the air-separator Type A (S=37.5 mm, C=30 mm, W=33 mm, and b=25 mm)

Grahic Jump Location
Figure 11

Fan characteristics affected by inlet opening widths S for a constant exit opening width C=18 mm for air-separator Type A, g/S=0.4, Za=35 mm, and W=33 mm

Grahic Jump Location
Figure 12

Effects of opening widths of the inlet and exit of air-separators on the improvement index BS with respect to stalling flow for g/S=0.4, Za=35 mm, and W=33 mm

Grahic Jump Location
Figure 13

A survey on tendency in stall improvement from SW stall point to AS stall point achieved by air-separators including axial-vane type and radial-vane type for axial-flow fans of axial-inlet type bladings. (a) Total-to-static characteristics. (b) Total-to-total characteristics. (Sources) MI and MII: Ref. 5, AEM: Ref. 6, MK: Ref. 8, ZME: Ref. 7, N: ( ∗) Ref. 13, MS: ( ∗) present report or Ref. 19, and MY: ( ∗) Ref. 9. Together with in-house data of Mitsubishi Heavy Industries, Ltd. Here, ( ∗) attached above shows results for radial-vaned AS, and none (without ( ∗)) for axial-vaned AS.

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In