International Conference «Mathematical and Informational Technologies, MIT-2013»
(X Conference «Computational and Informational Technologies for Science,
Engineering and Education»)

Vrnjacka Banja, Serbia, September, 5–8, 2013

Budva, Montenegro, September, 9-14, 2013

Platonov D.   Minakov A.   Dekterev A.  

Numerical investigation of spatial unsteady flows in hydraulic turbines of high-head power development

Reporter: Platonov D.

  There is no way to increase stability and efficiency of the hydraulic machines without studying the physical mechanisms of hydrodynamic processes, including very important transient phenomena, associated with the formation of large-scale vortex structures. One of the mechanisms for generation of pulsations is precession of vortex bundle, which formed behind the runner in underload or overload conditions of the turbine, where the flow after passing through a water turbine has a large residual twist.
  The precession of the vortex bundle offered a serious danger for hydro turbine facility in connection with the powerful flow pulsations that lead to heavy vibrations of turbine construction and can lead to facility destruction in the case of resonance. Pressure fluctuation generated by the precessing vortex bundle, can also affect the cavitation processes, that increasing cavitation erosion. To predict the resonance and search methods for suppression of instabilities requires detailed information about the characteristics of the pulsating regimes and the structure of the flow. It should be noted that developed approaches must meet the requirements to minimize the energy loss (increase turbine efficiency) that can only be realized on the basis of in-depth understanding of the hydrodynamic processes that occur in the flow parts of turbines.
  This paper presents a numerical algorithm that describes such kind of flow. Modeling of currents in the flow path of the Bureyskaya and Sayano-Shushenskaya HPP turbines was carried out. Comparison of the calculated data with the experimental data (field tests) was performed.
  According to the results of numerical modeling can be summarized that the selected mathematical models and numerical methods allowed (accurate within a few percent) to describe the behavior of the flow integral characteristics in a wide range of hydraulic turbine mode of operation. Also such methods allowed to qualitatively accurately describe the tendency of flow fluctuation characteristics behavior in turbine when the mode of operation changed, as well as with reasonable accuracy to reproduce the main oscillation frequencies of flow and the intensity of the pressure fluctuations in the flow path.

Abstracts file: PlatonovDV_tez.doc

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