Detail publikačního výsledku

Model of Pressure Pulsations in Hydraulic Turbine Draft Tube Based on Linearized

RUDOLF, P., POCHYLÝ, F., HABÁN, V.

Originální název

Model of Pressure Pulsations in Hydraulic Turbine Draft Tube Based on Linearized

Anglický název

Model of Pressure Pulsations in Hydraulic Turbine Draft Tube Based on Linearized

Druh

Stať ve sborníku v databázi WoS či Scopus

Originální abstrakt

Vortex rope appears in hydraulic turbine draft tube for partial load operation. This rope can, for certain sigma values, cavitate and contain saturated water vapour. Cavitating vortex rope is cause of pressure pulsations and effects dynamics of the whole turbine unit. Time behaviour of the spherical cavitating bubble is described by well-known Rayleigh-Plesset equation. This contribution presents derivation of the Rayleigh-Plesset equation for infinitely long cylindrical cavity imitating vortex rope. Linearized form of this equation accompanied by continuity equation and force equillibrium equation create basis for transfer matrix of the draft tube with cavitating vortex rope. Paper discusses ideas, steps of the derivation, but also necessary assumptions and simplifications leading to this new model. The final transfer matrix includes effect of the vortex rope volume change and can be included into the system of transfer matrices describing behaviour of the turbine unit with penstock.

Anglický abstrakt

Vortex rope appears in hydraulic turbine draft tube for partial load operation. This rope can, for certain sigma values, cavitate and contain saturated water vapour. Cavitating vortex rope is cause of pressure pulsations and effects dynamics of the whole turbine unit. Time behaviour of the spherical cavitating bubble is described by well-known Rayleigh-Plesset equation. This contribution presents derivation of the Rayleigh-Plesset equation for infinitely long cylindrical cavity imitating vortex rope. Linearized form of this equation accompanied by continuity equation and force equillibrium equation create basis for transfer matrix of the draft tube with cavitating vortex rope. Paper discusses ideas, steps of the derivation, but also necessary assumptions and simplifications leading to this new model. The final transfer matrix includes effect of the vortex rope volume change and can be included into the system of transfer matrices describing behaviour of the turbine unit with penstock.

Klíčová slova v angličtině

draft tube problems, machine dynamics behaviour

Autoři

RUDOLF, P., POCHYLÝ, F., HABÁN, V.

Vydáno

28.06.2006

Nakladatel

UPC Barcelona

Místo

Barcelona (Spain)

Kniha

Proceeding of Abstracts IAHR Int. Meeting of the Work Group on Cavitation and Dynamics Problems in Hydraulic Machinery and Systems.

Strany od

1

Strany počet

45

Plný text v Digitální knihovně

http://hdl.handle.net/

BibTex

@inproceedings{BUT24555,
  author="Pavel {Rudolf} and František {Pochylý} and Vladimír {Habán}",
  title="Model of Pressure Pulsations in Hydraulic Turbine Draft Tube Based on Linearized",
  booktitle="Proceeding of Abstracts IAHR Int. Meeting of the Work Group on Cavitation and Dynamics Problems in Hydraulic Machinery and Systems.",
  year="2006",
  pages="45",
  publisher="UPC Barcelona",
  address="Barcelona (Spain)"
}