Experimental observation of the precessing-vortex-core reconnection phenomenon in a combined-flow turbine

Platonov, D. V.; Минаков, А. В.; Dekterev, Dmitry; Maslennikova, Aleksandra V.; Куйбин, П. А.

doi:10.1134/s1063785017110086

Cited by 8 publications

(1 citation statement)

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“…In our previous works [41,42] conducted using this experimental test bench, in the modes close to the optimal, a very interesting phenomenon was revealed, namely, detachment of a vortex ring. Visualization of the flow vortex structure behind the runner of the turbine made it possible to detect the vortex reconnection at the opening of the guide vanes by 70%.…”

Section: Resultsmentioning

confidence: 88%

An Experimental Investigation of the Air Injection Effect on the Vortex Structure and Pulsation Characteristics in the Francis Turbine

Platonov¹,

Минаков²,

Dekterev³

et al. 2020

IJFMS

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The paper studies the pulsation characteristics of the flow when operating a medium-scale hydrodynamic test bench with a Francis turbine. The pressure fluctuations measurements and flow structure visualization were performed for all operation modes of the hydraulic unit. To control and suppress pulsations in the flow path, a series of experiments on air injection to the hydraulic unit were carried out. Comparison of pressure pulsations for single-phase and two-phase flow experimentation has shown that for modes with maximum loads, the pressure pulsations can be reduced almost to a half by means of air injection. The effect of air injection is also studied with respect to the efficiency of the hydraulic turbine.

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Section: Resultsmentioning

confidence: 88%