0
Research Papers

The Effects of Radially Distorted Incident Flow on Performance of Axial-Flow Fans With Forward-Skewed Blades

[+] Author and Article Information
B. Yang

e-mail: byang0626@sjtu.edu.cn

Ch. G. Gu

e-mail: cggu2006@126.com
School of Mechanical Engineering,
Shanghai Jiaotong University,
Shanghai, China

Contributed by International Gas Turbine Institute (IGTI) of ASME for publication in JOURNAL OF TURBOMACHINERY. Manuscript received August 1, 2011; final manuscript received August 31, 2011; published online October 31, 2012. Editor: David Wisler.

J. Turbomach 135(1), 011039 (Oct 31, 2012) (12 pages) Paper No: TURBO-11-1172; doi: 10.1115/1.4006535 History: Received August 01, 2011; Revised August 31, 2011

In this study, experiments and numerical simulations were carried out to evaluate the effects of radially distorted incident flow on the performance of axial-flow fans, which were equipped with three kinds of forward-skewed blades. Loss coefficient and velocity components at exit section as well as overall performance are discussed, both at the design point and the lower mass flow rate point. Furthermore, rotating stall was also observed by use of three dynamic pressure sensors. All results reveal that there are beneficial effects of forward-skewed blades on the fan performance, but the fan performance and its unsteady aerodynamic characteristics are quite affected by the radially distorted incident flow.

© 2013 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Scheme of definition of forward-skewed angle (a) 3 deg (b) 6 deg (c) 12 deg

Grahic Jump Location
Fig. 2

Three blades with different forward-skewed angles

Grahic Jump Location
Fig. 3

Seven-hole probe: (1) screen carrier, (2) impeller, (3) motor, (4) test tube, (5) straightening screen, (6) conical throttle. A, seven-hole probe at inlet of impeller; B, seven-hole probe at outlet of the impeller; C, dynamic pressure sensors; D, pitot probe.

Grahic Jump Location
Fig. 4

Scheme of experimental rig

Grahic Jump Location
Fig. 5

Instruments arrangement (a) efficiency (b) total pressure coefficient

Grahic Jump Location
Fig. 6

Fan performance under uniform inlet condition

Grahic Jump Location
Fig. 7

Distribution of loss coefficient spanwise at design point under uniform inlet condition

Grahic Jump Location
Fig. 8

Distribution of tangential velocity coefficient spanwise at design point under uniform inlet condition (a) 3 deg (b) 6 deg (c) 12 deg

Grahic Jump Location
Fig. 9

Contours of axial velocity at design point under uniform inlet condition

Grahic Jump Location
Fig. 10

Distribution of loss coefficient spanwise at lower mass flow rate point under uniform inlet condition

Grahic Jump Location
Fig. 11

Distribution of tangential velocity coefficient spanwise at lower mass flow rate point under uniform inlet condition (a) 3 deg (b) 6 deg (c) 12 deg

Grahic Jump Location
Fig. 12

Contours of axial velocity at lower mass flow rate point under uniform inlet condition (a) efficiency (b) total pressure coefficient

Grahic Jump Location
Fig. 13

Fan performance under hub-covered inlet condition

Grahic Jump Location
Fig. 14

Distribution of loss coefficient spanwise at design point under hub-covered inlet condition

Grahic Jump Location
Fig. 15

Distribution of tangential velocity coefficient spanwise at design point under hub-covered inlet condition (a) 3 deg (b) 6 deg (c) 12 deg

Grahic Jump Location
Fig. 16

Contours of axial velocity at design point under hub-covered inlet condition

Grahic Jump Location
Fig. 17

Distribution of loss coefficient spanwise at lower mass flow rate point under hub-covered inlet condition

Grahic Jump Location
Fig. 18

Distribution of tangential velocity coefficient spanwise at lower mass flow rate point under hub-covered inlet condition (a) 3 deg (b) 6 deg (c) 12 deg

Grahic Jump Location
Fig. 19

Contours of axial velocity at lower mass flow rate point under hub-covered inlet condition (a) efficiency (b) total pressure coefficient

Grahic Jump Location
Fig. 20

Fan performance under tip-covered inlet condition

Grahic Jump Location
Fig. 21

Distribution of loss coefficient spanwise at design point under tip-covered inlet condition

Grahic Jump Location
Fig. 22

Distribution of tangential velocity coefficient spanwise at design point under tip-covered inlet condition (a) 3 deg (b) 6 deg (c) 12 deg

Grahic Jump Location
Fig. 23

Contours of axial velocity at design point under tip-covered inlet condition

Grahic Jump Location
Fig. 24

Distribution of loss coefficient spanwise at lower mass flow rate point under tip-covered inlet condition

Grahic Jump Location
Fig. 27

Static pressure trace

Grahic Jump Location
Fig. 26

Contours of axial velocity at lower mass flow rate point under tip-covered inlet condition (a) uniform inlet condition (b) hub-covered inlet condition (c) tip-covered inlet condition

Grahic Jump Location
Fig. 25

Distribution of tangential velocity coefficient spanwise at lower mass flow rate point under tip-covered inlet condition (a) 3 deg (b) 6 deg (c) 12 deg

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 Journal Articles
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