In this paper, the periodically unsteady pressure field caused by rotor-stator interaction has been investigated numerically by computational fluid dynamics (CFD) calculation to evaluate the transient pressure variation in a single-blade pump for multiconditions. Side chamber flow effect is also considered for the simulation to accurately predict the flow in a whole-flow passage. The strength of the pressure fluctuation is analyzed quantitatively by defining the standard deviation of the pressure fluctuation of a revolution period. The analysis of the results shows that higher pressure fluctuation magnitudes can be observed near the blade pressure side and high gradients of fluctuation magnitudes can be obtained at the trailing edge near the pressure side of the blade. An asymmetrical distribution of fluctuation magnitudes in the volute domain can be clearly obtained. On the cylindrical surface around the impeller outlet, although the absolute pressure value is higher for the Q = 11 l/s condition, the magnitude distribution of fluctuations is lower, and a relatively symmetrical fluctuation distribution is obtained for the Q = 22 l/s condition when clearly asymmetrical distributions of fluctuation magnitude can be observed for the design point and for large flow rates. Obvious periodicity can be observed for the pressure fluctuation magnitude distribution on the circumference with different radii in the volute domain, and some subpeaks and subvalleys can be found. The effects of unsteady flow in the side chambers on the entire passage flow cannot be neglected for accurately predicting the inner flow of the pump. The results of unsteady pressure fluctuation magnitude can be used to guide the optimum design of the single-blade pump to decrease the hydrodynamic unbalance and to obtain more stable performance of the pump.

References

References
1.
Aoki
,
M.
, 1984, “
Instantaneous Interblade Pressure Distributions and Fluctuating Radial Thrust in a Single-Blade Centrifugal Pump
,”
Bull. JSME
,
27
(
233
), pp.
2413
2420
.
2.
Agostinelli
,
A.
,
Nobles
,
D.
, and
Mockridge
,
C. R.
, 1960, “
An Experimental Investigation of Radial Thrust in Centrifugal Pumps
,”
ASME J. Eng. Power
,
82
(
2
), pp.
120
125
.
3.
Siekmann
,
H.
, and
Stark
,
M.
, 1990, “
Analytical and Experimental Study of the Hydrodynamic Unbalance of Single-Vane Impellers
,” Third International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISRPMAC-3),
Honolulu
,
HI
, Paper No. D-28A.
4.
Benra
,
F.-K.
, 2006, “
Numerical and Experimental Investigation on the Flow Induced Oscillations of a Single-Blade Pump Impeller
,”
ASME J. Fluids Eng.
,
128
, pp.
783
793
.
5.
Benra
,
F.-K.
,
Dohmen
,
H. J.
, and
Sommer
,
M.
, 2005, “
Periodically Unsteady Flow in a Single-Blade Centrifugal Pump: Numerical and Experimental Results
,” Proceedings of
ASME
Fluids Engineering Division Summer Meeting, pp.
1223
1231
, Paper No. FEDSM2005-77219.
6.
Benra
,
F.-K.
,
Dohmen
,
H. J.
, and
Schneider
,
O.
, 2003, “
Investigation on the Unsteady Flow in Radial Waste Water Pumps to Determine the Hydrodynamic Forces
,” Proceedings of the 5th European Turbomachinery Conference, pp.
551
560
.
7.
De Souza
,
B.
,
Niven
,
A.
, and
Daly
,
J.
, 2008, “
Single-Blade Impeller Development Using the Design of Experiments Method in Combination With Numerical Simulation
,”
Proc. Inst. Mech. Eng., Part E
,
222
(
3
), pp.
135
142
.
8.
Nishi
,
Y.
,
Fujiwara
,
R.
, and
Fukutomi
,
J.
, 2009, “
Design Method for Single-Blade Centrifugal Pump Impeller
,”
J. Fluid Sci. Technol.
,
4
(
3
), pp.
786
800
.
9.
De Souza
,
B.
,
Niven
,
A.
, and
McEvoy
,
R.
, 2010, “
A Numerical Investigation of the Constant-Velocity Volute Design Approach as Applied to the Single Blade Impeller Pump
,”
ASME J. Fluids Eng.
,
132
, p.
061103
.
10.
Keays
,
J.
, and
Meskell
,
C.
, 2006, “
A Study of the Behavior of a Single-Bladed Waste-Water Pump
,”
Proc. Inst. Mech. Eng.
, Part E,
220
(
2
), pp.
79
87
.
11.
Auvinen
,
M.
,
Ala-Juusela
,
J.
,
Ilves
,
L.
, and
Siikonen
,
T.
, 2007, “
Dissecting a Complex System: A Computational Study of Flow Behavior in a Single-Blade Pump
,” 5th International Conference on Heat Transfer,
Fluid Mechanics and Thermodynamics
, Paper No. AM3.
12.
Auvinen
,
M.
,
Ala-Juusela
,
J.
, and
Pedersen
,
N.
, 2010, “
Transient Flow Simulations and Performance Analysis of a Single-Channel Pump
,”
5th OpenFOAM Workshop
,
Chalmers
,
Gothenburg, Sweden
.
13.
Menter
,
F. R.
, 1994, “
Two-Equation Eddy Viscosity Models for Engineering Applications
,”
AIAA J.
,
32
(
8
), pp.
1598
1605
.
14.
Benra
,
F.-K.
,
Feng
,
J.
, and
Dohmen
,
H. J.
, 2006, “
Numerical Study on Pressure Fluctuations in a Complete Stage of a Centrifugal Pump
,”
The Eleventh International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
,
Hawaii,
Paper No. ISROMAC11-2006-012.
15.
Feng
,
J.
,
Benra
,
F.-K.
, and
Dohmen
,
H. J.
, 2007, “
Numerical Investigation on Pressure Fluctuations for Different Configurations of Vaned Diffuser Pumps
,”
Int. J. Rotating Mach.
,
2007
, p.
34752
.
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