During the development stage of the liquid hydrogen turbopump for the main engine LE-7A of the H-IIA rocket, a new type of cavitation instability was observed. This instability occurs at lower cavitation numbers where the head of the inducer starts to decrease due to choke. The disturbance rotates around the rotor at about 50% of the inducer rotational speed. So, it is called “rotating choke.” In order to predict the instability, a cavity model with a cavity wake is developed. The region of instability and the frequency predicted by the model are in agreement with experiment. Discussions are made as to the relationship between rotating choke and rotating cavitation.
Issue Section:
Technical Papers
Keywords:
wakes,
rotational flow,
cavitation,
rotors,
flow instability,
rocket engines,
pumps,
turbines
1.
Shimura, T., Yoshida, M., Kamijo, K., Uchiumi, M., Yasutomi, Y., 2002, “Cavitation Induced Vibration Caused by Rotating-stall-type Phenomenon in LH2 Turbopump,” Proc. of the 9th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Honolulu, Hawaii, February 10–14.
2.
Tsujimoto, Y., Kamijo, K., Brennen, C., 1999, “Unified Treatment of Flow Instabilities of Turbomachinaries,” AIAA paper 99-2678.
3.
Horiguchi
, H.
, Watanabe
, S.
, Tsujimoto
, Y.
, Aoki
, M.
, 2000
, “A Theoretical Analysis of Alternate Blade Cavitation in Inducers
,” J. Fluids Eng.
, 122
(1
), pp. 156
–163
.4.
Greitzer
, E. M.
, 1976
, “Surge and Rotating Stall in Axial Flow Compressors, Part 1; Theoretical Compression System Model, Part 2; Experimental Results and comparison Theory
,” ASME J. Eng. Power
, 98
, pp. 190
–217
.5.
Stripling
, L. B.
, and Acosta
, A. J.
, 1962
, “Cavitation in Turbopump—Part 1
,” ASME J. Fluids Eng.
, 84
(3
), pp. 326
–338
.6.
Young, W. E. et al., 1972, “Study of Cavitating Inducer Instabilities,” Final Report, NACA-CR-123939, 1972-8.
7.
Knapp, R. T., Daily, J. W., and Hammit, F. G., 1970, “Cavitation,” McGraw-Hill, New York.
8.
Furness
, R. A.
, Hutton
, S. P.
, 1975
, “Experimental and Theoretical Studies on Two-dimensional Fixed-type Cavities
,” ASME J. Fluids Eng.
, 97
(4
), pp. 515
–522
.9.
Gogish, L. V., and Stepanov, G. Yu., 1979, “Turbulent Separated Flows” (in Russian), Moscow, Nauka.
10.
Gogish
, L. V.
, and Stepanov
, G. Yu.
, 1982
, “Turbulent Separated flows,” (in Russian
), Izvestija AN USSR Ser. Mechanika Zhidkosti i Gazov
, 2
, pp. 32
–47
.11.
Schlichting, H., 1960, “Boundary layer theory,” McGraw-Hill, New York.
12.
Semenov
, Yu.
, and Tsujimoto
, Y.
, 2003
, “A Cavity Wake Model Based on the Viscous/Inviscid Interaction Approach and Its Application to Non-symmetric Cavity Flows in Inducers
,” ASME J. Fluids Eng.
, 125
(5
), pp. 758
–766
.13.
Crocco
, L.
, and Lees
, L.
, 1952
, “A mixing theory for the interaction between dissipative flows and nearly isentropic streams
,” J. Aerosol Sci.
, 19
(10
), pp. 649
–676
.Copyright © 2004
by ASME
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