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International journal of fluid machinery and systems v.2 no.3, 2009년, pp.260 - 268   피인용횟수: 2

One-Dimensional Analysis of Full Load Draft Tube Surge Considering the Finite Sound Velocity in the Penstock

Chen, Changkun    (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   ); Tsujimoto, Yoshinobu    (Graduate School of Engineering Science, Osaka University  );
  • 초록

    The effects of acoustic modes in the penstock on the self-excited oscillation in hydraulic power system were studied by assuming a finite sound velocity in the penstock. The flow in the draft tube is considered to be incompressible assuming that the length of the draft tube is smaller than the wavelength of the oscillation. It was found that various acoustic modes in the penstock can become unstable (amplified) by the diffuser effect of the draft tube or the effect of swirl flow from the runner. Their effects on each mode are discussed.


  • 주제어

    Draft tube surge .   finite sound velocity .   higher order frequencies.  

  • 참고문헌 (9)

    1. Chen, C., Nicolet, C., Yonezawa, K., Farhat, M., Avellan, F., Tsujimoto, Y., 2008, “One-Dimensional Analysis of Full Load Draft Tube Surge”, ASME Trans. J. Fluids Eng., 130, 041106(2008). 
    2. Jacob, T., Prenat, J-E., 1996, “Francis Turbine Surge: Discussion and Data Base”, Proc. 18th IAHR Symposium, Valencia, Spain. 
    3. Nishi, M., 1984, “Surging Characteristics of Conical and Elbow Type Draft Tubes”, Pro. 12th IAHR Symposium on Hydraulic Machinery and System, Stirling, pp. 272-283. 
    4. Nishi, M., Matsunaga, S., Kubota, T., Senoo, Y., 1982, “Flow Regimes in an Elbow-Type Draft Tube”, Proc. 11th IAHR Symposium on Hydraulic Machinery and System, Amsterdam, pp. 1-13, paper 38. 
    5. Nishi, M., Wang, X., Okamoto, M., Matsunaga, S., 1994, “Further Investigation on the Pressure Fluctuations Caused by Cavitated Vortex Rope in an Elbow Draft Tube”, Cavitation and Gas Fluid Flow Machinery and Devices, ASME, pp. 63-70. 
    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”. In Proceeding of the 23rd IAHR Symposium, Yokohama, 2006, paper 135. 
    8. Brennen, C.E., 1994, Hydrodynamics of Pumps, Concepts ETI, Inc & Oxford Univ. Press, pp. 198-199. 
    9. Susan-Resiga, R., Ciocan, G.D., Anton, I., Avellan, F., 2006, “Analysis of the Swirling Flow Downstream a Francis Turbine Runner”, J. Fluid Eng., 128, pp. 177-189. 
  • 이 논문을 인용한 문헌 (2)

    1. 2012. "" International journal of fluid machinery and systems, 5(4): 152~160     
    2. 2013. "" International journal of fluid machinery and systems, 6(1): 33~48     

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