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- W4200607512 abstract "The pump-turbines as a flexible power generation facility have being operated within the off-design conditions for ensuring the constant power supply to respond to intermittent renewable energy sources such as solar and wind power. Especially, under the low flow rates of the off-design conditions, the complicated internal flows with vortex ropes in the draft tube destabilize the pump-turbine system. Therefore, in order to expand the reliable operating range, it is necessary to understand the internal flow and pressure phenomena under low flow rate conditions of the pump-turbines. In this study, the experiments of a laboratory-scale pump-turbine model were conducted to investigate the vortex characteristics according to the cavitation number at the turbine mode under low flow rate condition. Based on the experimental results, a two-phase (water and vapor) unsteady state RANS analyses were performed using SAS-SST turbulence model. Experimental and numerical investigations showed that the behavior and magnitude of visible vortex rope in the draft tube were in good agreement, and when the visible vortex rope was generated, a relatively higher swirl number and unsteady pressure were shown in the draft tube." @default.
- W4200607512 created "2021-12-31" @default.
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- W4200607512 date "2021-12-31" @default.
- W4200607512 modified "2023-09-29" @default.
- W4200607512 title "Vortex Characteristics in the Draft Tube at Turbine Mode of a Pump Turbine in a Laboratory-Scale Model" @default.
- W4200607512 doi "https://doi.org/10.5293/kfma.2021.24.6.012" @default.
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