Abstract

Three-dimensional (3D), three-component time-averaged velocity fields have been measured within a low-speed centrifugal fan with forward curved (FC) blades. The model investigated is representative of fans commonly used in automotive applications. The flow was analyzed at two Reynolds numbers for the same ratio of blade rotational speed to outlet flow velocity. The flow patterns inside the volute were found to have weak sensitivity to Reynolds number. A pair of counter-rotating vortices evolves circumferentially within the volute with positive and negative helicity in the upper and lower regions, respectively. Measurements have been further extended to capture phase-resolved flow features by synchronizing the data acquisition with the blade passing frequency. The mean flow field through each blade passage is presented including the jet-wake structure extending from the blade and the separation zone on the suction side of the blade leading edge.

References

References
1.
Cau
,
G.
,
Mandas
,
N.
,
Manfrida
,
G.
, and
Nurzia
,
F.
,
1987
, “
Measurements of Primary and Secondary Flows in an Industrial Forward-Curved Centrifugal Fan
,”
ASME J. Fluids Eng.
,
109
(
4
), pp.
353
358
.10.1115/1.3242671
2.
Velarde-Suarez
,
S.
,
Santolaria-Morros
,
C.
, and
Ballesteros-Tajadura
,
R.
,
1999
, “
Experimental Study on the Aeroacoustic Behavior of a Forward-Curved Blades Centrifugal Fan
,”
ASME J. Fluids Eng.
,
121
(
2
), pp.
276
281
.10.1115/1.2822202
3.
Raj
,
D.
, and
Swim
,
W. B.
,
1981
, “
Measurements of the Mean Flow Velocity and Velocity Fluctuations at the Exit of an FC Centrifugal Fan Rotor
,”
J. Eng. Power
,
103
(
2
), pp.
393
399
.10.1115/1.3230733
4.
Kjörk
,
A.
, and
Löfdahl
,
L.
,
1989
, “
Hot-Wire Measurements Inside a Centrifugal Fan Impeller
,”
ASME J. Fluids Eng.
,
111
(
4
), pp.
363
368
.10.1115/1.3243654
5.
Wolfram
,
D.
, and
Carolus
,
T. H.
,
2011
, “
Experimental and Numerical Investigation of the Unsteady Flow Field and Tone Generation in an Isolated Centrifugal Fan Impeller
,”
ASME
Paper No. GT2011-45244.10.1115/GT2011-45244
6.
Dong
,
R.
,
Chu
,
S.
, and
Katz
,
J.
,
1997
, “
Effect of Modification to Tongue and Impeller Geometry on Unsteady Flow, Pressure Fluctuations, and Noise in a Centrifugal Pump
,”
ASME J. Turbomach.
,
119
(
3
), pp.
506
515
.10.1115/1.2841152
7.
Pedersen
,
N.
,
Larsen
,
P. S.
, and
Jacobsen
,
C. B.
,
2003
, “
Flow in a Centrifugal Pump Impeller at Design and Off-Design Conditions—Part I: Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry (LDV) Measurements
,”
ASME J. Fluids Eng.
,
125
(
1
), pp.
61
72
.10.1115/1.1524585
8.
Visser
,
F. C.
,
Brouwers
,
J. J. H.
, and
Jonker
,
J. B.
,
1999
, “
Fluid Flow in a Rotating Low-Specific-Speed Centrifugal Impeller Passage
,”
Fluid Dyn. Res.
,
24
(
5
), pp.
275
292
.10.1016/S0169-5983(98)00033-1
9.
Lin
,
S. C.
, and
Tsai
,
M. L.
,
2012
, “
An Integrated Performance Analysis for a Backward-Inclined Centrifugal Fan
,”
Comput. Fluids
,
56
, pp.
24
38
.10.1016/j.compfluid.2011.11.009
10.
Elkins
,
C. J.
, and
Alley
,
M. T.
,
2007
, “
Magnetic Resonance Velocimetry: Applications of Magnetic Resonance Imaging in the Measurement of Fluid Motion
,”
Exp. Fluids
,
43
(
6
), pp.
823
858
.10.1007/s00348-007-0383-2
11.
Elkins
,
C. J.
,
Markl
,
M.
,
Pelc
,
N.
, and
Eaton
,
J. K.
,
2003
, “
4D Magnetic Resonance Velocimetry for Mean Velocity Measurements in Complex Turbulent Flows
,”
Exp. Fluids
,
34
(
4
), pp.
494
503
.10.1007/s00348-003-0587-z
12.
Norisada
,
K.
,
Sakai
,
M.
,
Ishiguro
,
S.
,
Kawaguchi
,
M.
,
Perot
,
F.
, and
Wada
,
K.
,
2013
, “
HVAC Blower Aeroacoustic Predictions
,”
SAE
Paper No. 2013-01-1001.10.4271/2013-01-1001
13.
Pelc
,
N. J.
,
Sommer
,
F. G.
,
Li
,
K. C.
,
Brosnan
,
T. J.
,
Herfkens
,
R. J.
, and
Enzmann
,
D. R.
,
1994
, “
Quantitative Magnetic Resonance Flow Imaging
,”
Magn. Reson. Q.
,
10
(
3
), pp.
125
147
.http://europepmc.org/abstract/MED/7811608
14.
Schiavazzi
,
D.
,
Coletti
,
F.
,
Iaccarino
,
G.
, and
Eaton
,
J. K.
,
2014
, “
A Matching Pursuit Approach to Solenoidal Filtering of Three-Dimensional Velocity Measurements
,”
J. Comput. Phys.
,
263
, pp.
206
221
.10.1016/j.jcp.2013.12.049
You do not currently have access to this content.