![]() International Nuclear Information System (INIS)įor a hydropower station with longer water conveyance system, an optimum turbine's selection will be beneficial to its reliable and stable operation. It was revealed that air delivery into the water-conveyance system of the turbine results in almost two-fold reduction of pressure pulsations.Įffects of turbine's selection on hydraulic transients in the long pressurized water conveyance system The effect of air injection on the intensity of pressure pulsations was studied at the maximum pressure pulsations in the hydraulic unit. ![]() The experiment was performed on large-scale hydrodynamic test-bench with impeller diameter of 0.3 m. The paper presents an experimental study of oscillatory response in the Francis turbine of hydraulic unit. Maslennikova, Alexandra Platonov, Dmitry Minakov, Andrey Dekterev, Dmitry However, as time passed by, such coincidence did not occure in shorter conveyance system.Įxperimental study of air delivery into water-conveyance system of the radial-axial turbine Coincidence of periods happened at the beginning and continued untill the end of data recording in the longer conveyance system. Shorter conveyance system had more pressure fluctuations and the minimum pressure did not occur in the first period. Destruction to the long conveyance system was more probable and maximum and minimum pressures occurred during the first period. In a shorter water conveyance system, the reduction of wave velocity had direct effect on maximum pressure. Wave velocity increase had direct effect on maximum pressures while velocity decrease affected minimum pressures. The results showed that Unsteady Vitkovsky method had minimum error comparing with other methods. The friction head loss was calculated by different methods. The pressure simulation was conducted using Bentley Hammer software. In the present study, the pressure was measured using a fast and sensitive pressure gauge in Bukan and Piranshahr water conveyance system. Numerical Comparison of Various Methods of Transient Flow Calculation in Water Conveyance Systems with Pumping Stationĭirectory of Open Access Journals (Sweden)įull Text Available Under transient flow condition, the behavior of water conveyance system varies according to their characteristics.
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