The effect of V-cut at impeller blades’ exit on internal pressure fluctuations, case vibration, and performance of a double volute boiler-feed pump has been investigated. Scaled model pump and two impellers, with and without the V-cut, were used in a closed water test loop to conduct experimental testing. The V-cut increases the effective gap between the trailing edge of the impeller blades and volute tongue reducing the impeller-volute interaction, which is the origin of pressure pulsation inside the pump. It reduces pump vibration by different amounts depending on flow rate. The V-cut is more effective in reducing pressure fluctuations at off-design conditions. The reduction in pressure fluctuations and pump vibration was achieved at the expense of pump head. The energy content of pressure fluctuations measured at discharge and suction pipes proved to be insignificant compared to those measured inside the pump.

References

References
1.
Khalifa
,
A.
,
Al-Qutub
,
A.
, and
Ben-Mansour
,
R.
, 2009, “
Experiments on Pressure Fluctuations in a High Pressure-Double Volute Centrifugal Pump Under Part Load Conditions
,”
Proceedings of the 4th International Conference on Thermal Energy: Theory and Applications
,
Abu-Dhabi
.
2.
Guo
,
S.
, and
Maruta
,
Y.
, 2005, “
Experimental Investigation on Pressure Fluctuations and Vibration of the Impeller in a Centrifugal Pump With Vaned Diffusers
,”
JSME Int. J., Ser. B
,
48
(
1
), pp.
136
143
.
3.
Baun
,
D.
, and
Flack
,
R.
, 2003, “
Effect of Volute Design and Number of Impeller Blades on Lateral Impeller Forces and Hydraulic Performance
,”
Int. J. Rotating Mach.
,
9
(
2
), pp.
145
152
.
4.
Gonzalez
,
J.
, and
Santolaria
,
C.
, 2006, “
Unsteady Flow Structure and Global Variables in a Centrifugal Pump
,”
ASME J. Fluids Eng.
,
128
, pp.
937
946
.
5.
Rodrigues
,
C.
,
Egusquiza
,
E.
, and
Santos
,
I.
, 2007, “
Frequencies in the Vibration Induced by Rotor Stator Interaction in a Centrifugal Pump Turbine
,”
ASME J. Fluids Eng.
,
129
(
11
), pp.
1428
1435
.
6.
Koji
,
K.
,
Mitsukiyo
,
M.
, and
Eiji
,
A.
, 1985, “
Velocity Distribution in the Impeller Passages of Centrifugal Pump
,”
Bull. JSME
,
28
(
243
), pp.
1963
1969
.
7.
Srivastav
,
O. P.
,
Pandu
,
K. R.
, and
Gupta
,
K.
, 2003, “
Effect of Radial Gap Between Impeller and Diffuser on Vibration and Noise in a Centrifugal Pump
,”
Journal of the Institution of Engineers (India): Mechanical Engineering Division
,
84
(
1
), pp.
36
39
.
8.
Makay
,
E.
,
Cooper
,
P.
,
Sloteman
,
D.
, and
Gibson
,
R.
, 1993, “
Investigation of Pressure Pulsations Arising From Impeller Diffuser Interaction in a Large Centrifugal Pump
,”
Proceedings: Rotating Machinery Conference and Exposition
,
ASME
, Vol.
1
.
9.
Shojaee
,
M.
, and
Boyaghchi
,
F.
, 2007, “
Studies on the Influence of Various Blade Outlet Angles in Centrifugal Pump When Handling Viscous Fluids
,”
Am. J. Appl. Sci.
,
4
(
9
), pp.
718
724
.
10.
Coleman
,
H.
, and
Steel
,
W.
, 1989,
Experimentation and Uncertainty Analysis for Engineers
2nd ed.
,
Wiley
,
New York
.
11.
Worster
,
R. C.
, 1963, “
The Flow in Volutes and Its Effect on Centrifugal Pump Performance
,”
Proc. Inst. Mech. Eng.
,
177
(
31
), pp.
843
875
.
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