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Dmitry Platonov,Andrey Minakov,Dmitry Dekterev,Alexandra Maslennikova 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.1
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.