Numerical investigation of the vortex core precession in a model hydro turbine with the aid of hybrid methods for computation of turbulent flows

Abstract

Numerical modeling of the unsteady flow in the draft tube of the test bench hydro turbine is conducted. The hybrid RANS-LES methods for modeling turbulent flows are compared. The intensity and frequency of pressure fluctuations, which are induced by the vortex core precession under the runner, and the integral characteristics are considered. An analysis of the synchronous and asynchronous parts of pressure fluctuations is done; the generating and influence of the synchronous component of fluctuations are considered. The vortex core interaction with the draft tube elbow is considered.

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Correspondence to A. V. Sentyabov.

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The work was financially supported by the Russian Foundation for Basic Research (Grants Nos. 13-08-98115, 14-08-31586), the RF Government for state support of scientific research conducted under the guidance of leading scientists in Russian higher schools (the leading scientist K. Hanjalic, Novosibirsk State University) (Grant No. 11.G34.31.0046).

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Sentyabov, A.V., Gavrilov, A.A., Dekterev, A.A. et al. Numerical investigation of the vortex core precession in a model hydro turbine with the aid of hybrid methods for computation of turbulent flows. Thermophys. Aeromech. 21, 707–718 (2014). https://doi.org/10.1134/S0869864314060055

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Key words

  • draft tube
  • vortex core precession
  • unsteady flow
  • hybrid RANS-LES methods
  • pressure fluctuations