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International journal of fluid machinery and systems v.1 no.1, 2008년, pp.64 - 75   피인용횟수: 3

Choked Surge in a Cavitating Turbopump Inducer

Watanabe, Toshifumi    (Graduate School of Engineering Science, Osaka University   ); Kang, Dong-Hyuk    (Graduate School of Engineering Science, Osaka University   ); Cervone, Angelo    (Graduate School of Engineering Science, Osaka University   ); Kawata, Yutaka    (Department of Mechanical Engineering, Osaka Institute of Technology   ); Tsujimoto, Yoshinobu    (Graduate School of Engineering Science, Osaka University  );
  • 초록

    During an experimental investigation on a 3-bladed and a 4-bladed axial inducer, a severe surge instability was observed in a range of cavitation number where the blade passage is choked and the inducer head is decreased from noncavitating value. The surge was stronger for the 4-bladed inducer as compared with a 3-bladed inducer with the same inlet and outlet blade angles. For the 4-bladed inducer, the head decreases suddenly as the cavitation number is decreased. The surge was observed after the sudden drop of head. This head drop was found to be associated with a rapid extension of tip cavity into the blade passage. The cause of surge is attributed to the decrease of the negative slope of the head-flow rate performance curve due to choke. Assuming that the difference between the 3 and 4-bladed inducers is caused by the difference of the blockage effects of the blade, a test was carried out by thickening the blades of the 3-bladed inducer. However, opposite to the expectations, the head drop became smoother and the instability disappeared on the thickened blade inducer. Examination of the pressure distribution on both inducers could not explain the difference. It was pointed out that two-dimensional cavitating flow analyses predict smaller breakdown cavitation number at higher flow rates, if the incidence angle is smaller than half of the blade angle. This causes the positive slope of the performance curve and suggests that the choked surge as observed in the present study might occur in more general cases.


  • 주제어

    Cavitation .   instabilities .   inducers .   surge.  

  • 참고문헌 (10)

    1. Tsujimoto, Y., Kamijo, K. and Brennen, C.E., 2001, “Unified Treatments of Instabilities of Turbomachines”, AIAA Journal of Propulsion and Power, Vol.117, No.3, pp.636-643. 
    2. Young, W. E., 1972, “Study of Cavitating Inducer Instabilities”, Final Report, NACA-CR-123939. 
    3. Shimura, T., Yoshida, M., Kamijo, K., Uchiumi, M. and 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. 
    4. Semenov, Y., Fujii, A., Tsujimoto, Y., 2004, “ Rotating Choke in Cavitating Inducer”, ASME Journal of Fluids Engineering, Vol.126, No.1, pp.87-93. 
    5. Uchiumi, M. and Kamijo, K., 2008, “Occurrence Range of a Rotating-stall-type Phenomenon in a High Head Liquid Hydrogen Inducer”, Proc. of the 12th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Honolulu, Hawaii, February 17-22. 
    6. Brennen, C. E. and Acosta, A. J., 1973, “Theoretical, quasistatic analysis of cavitation compliance in turbopumps”, J. of Spacecraft and Rockets, Vol.10, No.3, pp. 175-180. 
    7. Yokota, K., Kurahara, K., Kataoka, D., Tsujimoto, Y. and Acosta, A., 1999, “A Study of Swirling Backflow and Vortex Structure at the Inlet of an Inducer”, JSME International Journal, Ser. B., Vol.142, No.3, pp.451-459. 
    8. Furukawa, A., Ishizaka, K. and Watanabe, S., 2001, “Experimental Study of Cavitation Induced Oscillation in Helical Inducers with Various Blade Lengths”, Transactions of JSME (in Japanese), Ser. B, Vol.67, No.662, pp.37-42. 
    9. Yoshida, Y., Seiji, A., Tsujimoto, Y. and Laffite, S., 2001, “Effects of Leading Edge Sweep on Unsteady Cavitation in Inducers (2nd report, Problems of Forward and Backward Sweep)”, Transactions of JSME, Ser. B, Vol.67, No.658, pp.1367-1375. 
    10. Brennen, C. E., 1994, Hydrodynamics of Pumps, Concepts ETI, Inc. and Oxford University Press. 
  • 이 논문을 인용한 문헌 (3)

    1. 2009. "" International journal of fluid machinery and systems, 2(3): 232~238     
    2. 2009. "" International journal of fluid machinery and systems, 2(4): 439~448     
    3. 2010. "" International journal of fluid machinery and systems, 3(2): 137~149     

 저자의 다른 논문

  • Kang, Dong-Hyuk (4)

    1. 2009 "Cause of Cavitation Instabilities in Three Dimensional Inducer" International journal of fluid machinery and systems 2 (3): 206~214    
    2. 2009 "Large Eddy Simulation of the Dynamic Response of an Inducer to Flow Rate Fluctuations" International journal of fluid machinery and systems 2 (4): 431~438    
    3. 2009 "Inducer Design to Avoid Cavitation Instabilities" International journal of fluid machinery and systems 2 (4): 439~448    
    4. 2010 "Suppression of Cavitation Instabilities in an Inducer by Circumferential Groove and Explanation of Higher Frequency Components" International journal of fluid machinery and systems 3 (2): 137~149    

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