In the previous linear analysis (Tsujimoto et al., 1993) it was found that there can be a backward rotating cavitation as well as a forward mode which rotates faster than impeller. Although some shaft vibration has been observed, which might be caused by the backward mode, experimental evidence has been obtained only for the forward mode. The purpose of the present study is to find out the factors which determine the amplitude of each mode of rotating cavitation by taking into account several nonlinearities. A time marching nonlinear 2-D flow analysis was carried out for this purpose. It was found that the increase of cavitation compliance at lower inlet pressure can be a factor which limits the amplitude. The mode selectivity is mainly dependent on the stability limit obtained by a linear analysis for which the phase delay of cavity has a most important effect.

Issue Section:
Research Papers
Topics:
Cavitation, Flow (Dynamics), Cavities, Delays, Impellers, Pressure, Stability, Vibration
1.
Braisted, D. M., and Brennen, C. E., 1980, “Auto-oscillation of Cavitating Inducers,” ASME Symposium on Polyphase Flow and Transport Technology, pp. 157–166.
2.
Brennen
C. E.
,
1978
, “
Bubbly Flow Model for the Dynamic Characteristics of Cavitating Pumps
,”
Journal of Fluid Mechanics
, Vol.
89
, Part 2, pp.
223
–
240
.
3.
Brennen
C. E.
,
Meissner
C.
,
Lo
E. Y.
, and
Hoffman
G. S.
,
1982
, “
Scale Effects in the Dynamic Transfer Functions for Cavitating Inducers
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, Vol.
104
, pp.
428
–
433
.
4.
Kamijo
K.
,
Yoshida
M.
, and
Tsujimoto
Y.
,
1986
, “
Hydraulic and Mechanical Performance of LE-7 LOX Pump Inducer
,”
AIAA Journal of Propulsion and Power
, Vol.
9
, No.
6
, pp.
819
–
826
.
5.
Moore
F. K.
, and
Greitzer
E. M.
,
1986
, “
A Theory of Post-stall Transients in Axial Compression Systems, Part I
,”
ASME Journal of Engineering for Gas Turbines and Power
, Vol.
108
, pp.
68
–
76
.
6.
Otsuka, S., Tsujimoto, Y., Kamijo, K., and Furuya, O., 1994, “Frequency Dependence of Mass Flow Gain Factor and Cavitation Compliance of Cavitating Inducers,” ASME Symposium on Cavitation and Gas-Liquid Flows in Fluid Machinery and Devices, FED-Vol. 190, pp. 119–126.
7.
Tsujimoto, Y., Kamijo, K., and Yoshida, Y., 1992, “Theoretical Analysis of Rotating Cavitation in Rocket Pump Inducers,” AIAA Paper 92-3209.
8.
Tsujimoto
Y.
,
Kamijo
K.
, and
Yoshida
Y.
,
1993
, “
A Theoretical Analysis of Rotating Cavitation in Inducers
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, Vol.
115
, No.
1
, pp.
135
–
141
.
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