International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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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)
  • Received : 2009.04.01
  • Accepted : 2009.06.22
  • Published : 2009.09.01
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Abstract

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.

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References

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