Evolution of a swirling flow in a draft tube model at transient operation regimes

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This work deals with the experimental study of transient flow regimes occurring in the laboratory model of a hydraulic turbine draft tube at a change in the control parameters of setup. The transition from the partial load regime, when a precessing vortex core is formed, to the best efficiency point without a core is considered. To set accurately the speed of runner rotation and the flow rate of the working medium, the setup was controlled by special software. To ensure accurate multiple reproduction of a given transition cycle between two regimes, the control program has been upgraded. Using a specially developed procedure of phase averaging of a laser Doppler anemometer (LDA) signal recorded during multiple repetitions of transient regimes, the velocity profiles were obtained for different phases of changing the setup operating conditions.

Original languageEnglish
Pages (from-to)153-156
Number of pages4
JournalThermophysics and Aeromechanics
Issue number1
Publication statusPublished - 1 Jan 2020


  • acoustic sensors
  • draft tube
  • laser-Doppler anemometer
  • phase (conditional) averaging
  • precessing vortex core
  • transient regime


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