Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube

Ivan Litvinov, Daniil Suslov, Evgeny Gorelikov and Sergey Shtork
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Ivan Litvinov: Kutateladze Institute of Thermophysics, 630090 Novosibirsk, Russia
Daniil Suslov: Kutateladze Institute of Thermophysics, 630090 Novosibirsk, Russia
Evgeny Gorelikov: Kutateladze Institute of Thermophysics, 630090 Novosibirsk, Russia
Sergey Shtork: Kutateladze Institute of Thermophysics, 630090 Novosibirsk, Russia

Energies, 2021, vol. 14, issue 5, 1-13

Abstract: Swirling flow with the formation of a precessing vortex core (PVC) in the draft tube model of a hydroturbine was studied. Experiments were performed on an aerodynamic setup under transient operating conditions of the hydroturbine. The turbine operating conditions were varied by continuously changing the flow rate at a constant runner speed. The transition from the partial load regime, when a precessing vortex core is formed, to the best efficiency point without a core is considered. Applied to this task, a comparison of the windowed Fourier transform with wavelet analysis is given. The dependence of the PVC lifetime in the transient regime correlates with the transient time. It is shown that the velocity profiles and the spectrum of pressure pulsations in transient regimes change quasistatically between part-load operation and the best efficiency point of the turbine. The phase-averaged velocity distributions in the transient regimes show that a transient regime is a sequence of quasisteady regimes.

Keywords: draft tube; precessing vortex core; transient regime; laser-Doppler anemometer; acoustic sensors; phase (conditional) averaging (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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