A set of 4-bladed inducers with various amounts of cutback was tested with the aim of suppressing the rotating cavitation by applying alternate leading edge cutback. Unsteady cavitation patterns were observed by means of inlet pressure measurements and high-speed video pictures. It was found that the region with the alternate blade cavitation and asymmetric cavitation were enlarged with the increase of the amount of the cutback. As a result, the region with the rotating cavitation was diminished. At low flow rate, two types of alternate blade cavitation were found as predicted theoretically on 4-bladed inducer with smaller uneven blade length. One of them is with longer cavities on longer blades, and the other is with longer cavities on shorter blades. Switch was observed in these alternate blade cavitation patterns depending whether the cavitation number was increased or decreased. For an inducer with larger amount of cutback, the rotating cavitation and cavitation surge were almost suppressed as expected for a wide range of flow rate and cavitation number, although the cavitation performance was deteriorated. However, we should note that an asymmetric cavitation pattern occurs more easily in inducers with alternate leading edge cutback, and that the unevenness due to the cutback causes uneven blade stress.

Issue Section:
Technical Papers
Keywords:
cavitation, rotation, turbines, hydrodynamics
Topics:
Blades, Cavitation, Cavities
1.
Rosenmann, W., 1965, “Experimental Investigation of Hydrodynamically Induced Shaft Forces with a Three-Bladed Inducer,” Proceedings of the Symposium on Cavitation in Fluid Machinery, ASME Winter Annual Meeting, pp. 172–195.
2.
Kamijo
,
K.
,
Yoshida
,
M.
, and
Tsujimoto
,
Y.
,
1993
, “
Hydraulic and Mechanical Performance of LE-7 LOX Pump Inducer
,”
AIAA Journal of Propulsion and Power
,
9
, No.
6
, pp.
819
–
826
.
3.
de Bernaldi, J., Joussellin, F., and Von Kaenel, A., 1993, “Experimental Analysis of Instabilities related to Cavitation in a Turbopump Inducer,” The First International Symposium on Pump Noise and Vibrations, Clamart, France, pp. 1–9.
4.
Bordelon, W. J., Gaddis, S. W., and Nesman, T. E., 1995, “Cavitation Environment of the Alternate High Pressure Oxygen Turbopump Inducer,” ASME FED-Vol. 210, pp. 39–46.
5.
Kamijo, K., Shimura, T., and Watanabe, M., 1977, “An Experimental Investigation of Cavitating Inducer Instability,” ASME Paper 77-WA/FW-14.
6.
Tsujimoto
,
Y.
,
Kamijo
,
K.
, and
Yoshida
,
Y.
,
1993
, “
A Theoretical Analysis of Rotating Cavitation in Inducers
,”
ASME J. Fluids Eng.
,
115
, No.
1
, pp.
135
–
141
.
7.
Goirand, B., Mertz, A-L., Joussellin, F., and Rebattet, C., 1992, “Experimental Investigations of Radial Loads Induced by Partial Cavitation with Liquid Hydrogen Inducer,” IMechE, C453/056, pp. 263–269.
8.
Huang
,
J. D.
,
Aoki
,
M.
, and
Zhang
,
J. T.
,
1998
, “
Alternate Blade Cavitation on Inducer
,”
JSME International Journal, Series B
,
41
, No.
1
, pp.
1
–
6
.
9.
Acosta, A. J., 1958, “An Experimental Study of Cavitating Inducer,” Proceedings of the Second Symposium on Naval Hydrodynamics, ONR/ACR-38, pp. 537–557.
10.
Iura, T., discussion in reference 9.
11.
Horiguchi
,
H.
,
Watanabe
,
S.
,
Tsujimoto
,
Y.
, and
Aoki
,
M.
,
2000
, “
A Theoretical Analysis of Alternate Blade Cavitation in Inducers
,”
ASME J. Fluids Eng.
,
122
, No.
1
, pp.
156
–
163
.
12.
Tsujimoto
,
Y.
,
Yoshida
,
Y.
,
Maekawa
,
Y.
,
Watanabe
,
S.
, and
Hashimoto
,
T.
,
1997
, “
Observations of Oscillating Cavitations of an Inducer
,”
ASME J. Fluids Eng.
,
119
, No.
4
, pp.
775
–
781
.
13.
Watanabe
,
S.
,
Sato
,
K.
,
Tsujimoto
,
Y.
, and
Kamijo
,
K.
,
1999
, “
Analysis of Rotating Cavitation in a Finite Pitch Cascade Using Closed Cavity Model and a Singularity Method
,”
ASME J. Fluids Eng.
,
121
, No.
4
, pp.
834
–
840
.
14.
Acosta, A. J., 1955, “A note on Partial Cavitation of Flat Plate Hydrofoils,” Caltech Hydro Lab. Report No. E-19.9.
15.
Horiguchi
,
H.
,
Watanabe
,
S.
, and
Tsujimoto
,
Y.
,
2000
, “
Theoretical Analysis of Cavitation in Inducers With Unequal Blades With Alternate Leading Edge Cutback, Parts I and II
,”
ASME J. Fluids Eng.
,
122
, No.
2
, pp.
412
–
418
, 419–424.
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 by ASME
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