Modern pumps are designed to guarantee a sufficiently large operating range or to satisfy the performance requirements relative to more than one operating point. This study applies trailing-edge (TE) modification method based on TE rounding in the suction surface to widen the operating range of a mixed-flow pump. The effects of TE modification on the performance and internal flow of the mixed-flow pump are investigated through computational fluid dynamics (CFD) analysis. Local Euler head distribution is introduced to reveal the pattern of energy growth along the blade-aligned (BA) streamwise location. A pump model with TE modification is tested, and numerical results agree well with experimental data. The results show that TE modification significantly improves pump efficiency in the high flow rate region by more than 10%. The best pattern of normalized local Euler head distribution (NLEHD) is a convex curve of nearly constant growth rate. The overall heads are also improved, and the flow near the exit of the impeller exhibits better uniformity. This finding demonstrates that a small change in the TE of the impeller can influence flow structure in most areas of impeller channels and that the local Euler head distribution is closely related to pump efficiency. TE modification can effectively improve the performance of the mixed-flow pump with high flow rate.

References

References
1.
Goto
,
A.
,
1992
, “
The Effect of Tip Leakage Flow on Part-Load Performance of a Mixed-Flow Pump Impeller
,”
ASME J. Turbomach.
,
114
(
2
), pp.
383
391
.10.1115/1.2929155
2.
van Esch
,
B. P. M.
, and
Kruyt
,
N. P.
,
2001
, “
Hydraulic Performance of a Mixed-Flow Pump: Unsteady Inviscid Computations and Loss Models
,”
ASME J. Fluids Eng.
,
123
(
2
), pp.
256
264
.10.1115/1.1365121
3.
Oh
,
H. W.
,
Yoon
,
E. S.
,
Kim
,
K. S.
, and
Ahn
,
J. W.
,
2003
, “
A Practical Approach to the Hydraulic Design and Performance Analysis of a Mixed-Flow Pump for Marine Waterjet Propulsion
,”
Proc. Inst. Mech. Eng. Part A
,
217
(
6
), pp.
659
664
.10.1177/095765090321700610
4.
Oh
,
H. W.
, and
Kim
,
K. Y.
,
2001
, “
Conceptual Design Optimization of Mixed-Flow Pump Impellers Using Mean Streamline Analysis
,”
Proc. Inst. Mech. Eng. Part A
,
215
(
1
), pp.
133
138
.10.1243/0957650011536499
5.
Yoon
,
E. S.
,
Oh
,
H. W.
,
Chung
,
M. K.
, and
Ha
,
J. S.
,
1998
, “
Performance Prediction of Mixed-Flow Pumps
,”
Proc. Inst. Mech. Eng. Part A
,
212
(
2
), pp.
109
115
.10.1243/0957650981536637
6.
Kim
,
J. H.
, and
Kim
,
K. Y.
,
2012
, “
Analysis and Optimization of a Vaned Diffuser in a Mixed Flow Pump to Improve Hydrodynamic Performance
,”
ASME J. Fluids Eng.
,
134
(
7
), p.
071104
.10.1115/1.4006820
7.
Kim
,
J. H.
,
Ahn
,
H. J.
, and
Kim
,
K. Y.
,
2010
, “
High-Efficiency Design of a Mixed-Flow Pump
,”
Sci. China, Ser. E: Technol. Sci.
,
53
(
1
), pp.
24
27
.10.1007/s11431-009-0424-6
8.
Zangeneh
,
M.
,
Goto
,
A.
, and
Takemura
,
T.
,
1996
, “
Suppression of Secondary Flows in a Mixed-Flow Pump Impeller by Application of Three-Dimensional Inverse Design Method: Part 1—Design and Numerical Validation
,”
ASME J. Turbomach.
,
118
(
3
), pp.
536
543
.10.1115/1.2836700
9.
Zangeneh
,
M.
,
Goto
,
A.
, and
Harada
,
H.
,
1998
, “
On the Design Criteria for Suppression of Secondary Flows in Centrifugal and Mixed Flow Impellers
,”
ASME J. Turbomach.
,
120
(
4
), pp.
723
735
.10.1115/1.2841783
10.
Goto
,
A.
, and
Zangeneh
,
M.
,
2002
, “
Hydrodynamic Design of Pump Diffuser Using Inverse Design Method and CFD
,”
ASME J. Fluids Eng.
,
124
(
2
), pp.
319
328
.10.1115/1.1467599
11.
Decook
,
S. J.
,
King
,
P. I.
, and
Elrod
,
W. C.
,
1993
, “
Wake Mixing and Performance of a Compressor Cascade With Crenulated Trailing Edges
,”
J. Propul. Power
,
9
(
2
), pp.
293
300
.10.2514/3.23621
12.
Christopher
,
S.
, and
Kumaraswamy
,
S.
,
2013
, “
Identification of Critical Net Positive Suction Head From Noise and Vibration in a Radial Flow Pump for Different Leading Edge Profiles of the Vane
,”
ASME J. Fluids Eng.
,
135
(
12
), p.
121301
.10.1115/1.4025072
13.
Corsini
,
A.
,
Delibra
,
G.
, and
Sheard
,
A. G.
,
2013
, “
On the Role of Leading-Edge Bumps in the Control of Stall Onset in Axial Fan Blades
,”
ASME J. Fluids Eng.
,
135
(
8
), p.
081104
.10.1115/1.4024115
14.
Bing
,
H.
, and
Cao
,
S. L.
,
2013
, “
Three-Dimensional Design Method for Mixed-Flow Pump Blades With Controllable Blade Wrap Angle
,”
Proc. Inst. Mech. Eng. Part A
,
227
(
5
), pp.
567
584
.10.1177/0957650913489296
15.
Yang
,
W.
,
Wu
,
Y. L.
, and
Liu
,
S. H.
,
2011
, “
An Optimization Method on Runner Blades in Bulb Turbine Based on CFD Analysis
,”
Sci. China: Technol. Sci.
,
54
(
2
), pp.
338
344
.10.1007/s11431-010-4261-4
16.
Singh
,
P.
, and
Nestmann
,
F.
,
2011
, “
Internal Hydraulic Analysis of Impeller Rounding in Centrifugal Pumps as Turbines
,”
Exp. Therm. Fluid Sci.
,
35
(
1
), pp.
121
134
.10.1016/j.expthermflusci.2010.08.013
17.
Gülich
,
J. F.
,
2010
,
Centrifugal Pumps
,
Springer
,
Berlin
, Chap. 4.10.1007/978-3-642-12824-0
18.
ANSYS
,
2012
, “
ansys CFD-Post User's Guide
,” Release 14.5,
ANSYS, Inc.
,
Canonsburg, PA
.
You do not currently have access to this content.