Analysis of the flow structure in the model of a microhydraulic turbine

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Abstract

This paper describes the results of experimental studies of a flow using the prototype of a propeller-type microhydraulic turbine. The tests are carried out on a testbed in which atmospheric air is used as a working medium. The measurements carried out with the help of a two-component laser-Doppler anemometer are used to obtain velocity distributions behind a runner in the case where the operating modes of the device change in a wide range. It is shown that the created model microhydraulic turbine has optimal parameters for the conditions set during the design, and a change in the operating mode of the device from nominal parameters to underload or overload increases the residual swirl of the flow and the generation of strong hydrodynamic instability in the form of a precessing vortex rope. In this case, axial velocity over the cross section is distributed unevenly and the flow pulsation level is increased.

Original languageEnglish
Pages (from-to)807-813
Number of pages7
JournalJournal of Applied Mechanics and Technical Physics
Volume61
Issue number5
DOIs
Publication statusPublished - Sep 2020
Externally publishedYes

Keywords

  • experiment
  • hydroelectric power plants
  • laser-Doppler anemometer
  • microhydroturbines
  • propeller hydroturbine
  • vortex rope precession

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