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International journal of fluid machinery and systems v.3 no.1, 2010년, pp.91 - 101   피인용횟수: 2

Experimental Study and Numerical Simulation of Cavity Oscillation in a Conical Diffuser

Chen, Chang-Kun    (Graduate School of Engineering Science, Osaka University   ); Nicolet, Christophe    (Laboratory for Hydraulic Machines, EPFL - Swiss Federal Institute of Technology   ); Yonezawa, Koichi    (Graduate School of Engineering Science, Osaka University   ); Farhat, Mohamed    (Laboratory for Hydraulic Machines, EPFL - Swiss Federal Institute of Technology   ); Avellan, Francois    (Laboratory for Hydraulic Machines, EPFL - Swiss Federal Institute of Technology   ); Miyazawa, Kazuyoshi    (Nagasaki R&D Center, Mitsubishi Heavy Industries, LTD   ); Tsujimoto, Yoshinobu    (Laboratory for Hydraulic Machines, EPFL - Swiss Federal Institute of Technology  );
  • 초록

    Based on the one-dimensional stability analysis, the self-excited oscillation in hydraulic power generating systems was studied by a simple experiment and numerical simulation. It was shown that a cavity in a conical diffuser can cause surge. With the diffuser, a high amplitude and low frequency oscillation occurs at low cavitation number. This oscillation was not observed with the straight pipe. It was confirmed that the diffuser effect of the draft tube can be the cause of the full load surge in hydraulic power system. Numerical results were also analyzed to check the validity of the one-dimensional stability analysis.


  • 주제어

    Draft tube surge .   diffuser effect .   cavitation.  

  • 참고문헌 (9)

    1. Nishi, M., “Surging Characteristics of Conical and Elbow Type Draft Tubes,” Proceeding of the 12th IAHR Symposium on Hydraulic Machinery and System, Stirling, 1984, pp. 272-283. 
    2. Nishi, M., Matsunaga, S., Kubota, T., Senoo, Y., “Flow Regimes in an Elbow-Type Draft Tube”. Proceeding of the 11th IAHR Symposium on Hydraulic Machinery and System, Amsterdam, 1982, pp. 1-13, paper 38. 
    3. Nishi, M., Wang, X., Okamoto, M., Matsunaga, S., “Further Investigation on the Pressure Fluctuations Caused by Cavitated Vortex Rope in an Elbow Draft Tube,” In Cavitation and Gas Fluid Flow Machinery and Devices (1994), ASME, pp. 63-70. 
    4. Prenat, J-E., Jacob, T., “Investigating the Behavior at High Load of a Francis Turbine Model,” 13th IAHR Symposium, Montreal, 1986. 
    5. Arzola, F., Azuaje, C., Zambrano, P., Gulbrandsen, G., “Undesired Power Oscillations at High Load in Large Francis Turbines. Experimental Study and Solution,” 23rd IAHR Symposium, Yokohama, 2006. 
    6. Koutnik, J., Pulpitel, L., “Modeling of the Francis Turbine Full-Load Surge,” Modeling, Testing and Monitoring for Hydro Power Plants, Lausanne, 1996. 
    7. Koutnik, J., Nicolet, C., A.Schoul, G., Avellen, F., “Overload Surge Event in a Pumped- Storage Power Plant,” 23rd IAHR Symposium, Yokohama, 2006. 
    8. Chen, C., Nicolet, C., Yonezawa, K., Farhat, M., Avellen, F., Tsujimoto, Y., “One-Dimensional Analysis of Full Load Draft Tube Surge,” ASME Journal of Fluids Engineering, vol.130, Issue 4, 041106. 
    9. Sabersky, R., 1999, “Fluid Flow: A First Course in Fluid Mechanics, 4th ed.,” Prentice-Hall, New Jersey. 
  • 이 논문을 인용한 문헌 (2)

    1. 2010. "" International journal of fluid machinery and systems, 3(1): 80~90     
    2. 2012. "" International journal of fluid machinery and systems, 5(4): 152~160     

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