A theoretical and experimental study has been made on the dynamic characteristics of a centrifugal pump subject to sinusoidal changes in rotational speed. Time-dependent rotational speed, flow-rate, and total pressure rise are measured for a variety of amplitude and frequency of the fluctuating rotational speed. Measured flow-rate as well as total pressure rise is compared with the quasi-steady ones. Unsteady flow analysis is made for a two-dimensional circular cascade by use of the singularity method. The calculated frequency characteristics are compared with the corresponding experimental ones. The deviation of unsteady characteristics from quasi-steady ones is evident, and the numerical results agree qualitatively with the measured ones. It was found that with the increased frequency of rotational speed fluctuations the dynamic characteristics deviate remarkably from quasi-steady ones. Moreover, a criterion for the assumption of quasi-steady change is presented.

1.
Anderson, D. A., Blade, R. J., and Stevans, W., 1971, “Response of a Radial-Bladed Centrifugal Pump to Sinusoidal Disturbances for Noncavitating Flow,” NASA TN D-6556.
2.
Brennen
C.
, and
Acosta
A. J.
,
1976
, “
The Dynamic Transfer Function for a Cavitating Inducer
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, Vol.
98
, No.
2
, pp.
182
191
.
3.
Guarga, R., 1991, “Instability due to Performance Characteristics,” Vibration and Oscillation of Hydraulic Machinery, H. Ohashi, ed., Avebury Technical, Aldershot, pp. 175–196.
4.
Imaichi
K.
,
Tsujimoto
Y.
, and
Yoshida
Y.
,
1982
, “
An Analysis of Unsteady Torque on a Two-Dimensional Radial Impeller
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, Vol.
104
, No.
2
, pp.
228
234
.
5.
Knapp
R. T.
,
1937
, “
Complete Characteristics of Centrifugal Pumps and Their Use in the Prediction of Transient Behavior
,”
ASME Transactions
, Vol.
59
, pp.
683
689
.
6.
Mook
D. T.
, and
Dong
B.
,
1994
, “
Perspective: Numerical Simulations of Wakes and Blade-Vortex Interaction
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, Vol.
116
, pp.
5
21
.
7.
Ohashi, H., 1968, “Analytical and Experimental Study of Dynamic Characteristics of Turbopumps,” NASA TN D-4298.
8.
Stirnemann
A.
,
Eberl
J.
,
Bolleter
U.
, and
Pace
S.
,
1987
, “
Experimental Determination of the Dynamic Transfer Matrix for a Pump
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, Vol.
109
, pp.
218
225
.
9.
Tsukamoto
H.
,
Matsunaga
S.
,
Yoneda
H.
, and
Hata
S.
,
1986
, “
Transient Characteristics of a Centrifugal Pump During Stopping Period
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, Vol.
108
, No.
4
, pp.
392
399
.
10.
Whitehead, D. S., 1960, “Force and Moment Coefficient for Vibration Aerofoils in Cascade,” Aeronautical Research Council, Report and Memoranda, No. 3254.
This content is only available via PDF.
You do not currently have access to this content.