Experimental Studies of Pump-Turbine Flow Part Models at Heads of 80–120 m

Khoryev, Oleg; Korotaіev, Pavlo; Agibalov, Yevgen; Bykov, Yu. V.; Maksymenko-Sheiko, Kyrylo V.

doi:10.1007/978-3-031-18487-1_3

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“…To confi rm the results of numerical studies and obtain reliable data in a wide range of turbine and pump modes, experimental selective tests of models with three options of runner with a dia meter of D 1 = 350 mm were carried out on the IMEP ECS-30 hydrodynamic test stand. The IMEP hyd rodynamic stands have the status of national heritage and meet all the requirements of the international standard IEC 60193 for mo del acceptance tests of hydraulic machines of various types [40]. Table 1 shows a comparison of the mea surement errors of parameters according to the requirements of IEC 60193 with the values achieved on the ECS-30 test stand.…”

Section: Conclusion the Determined Infl Uence Of Spatial Shape Of The...mentioning

confidence: 99%

Experimental Studies of Pressure Pulsations in Draft Tube Diffuser of Pump-Turbine Models for Heads up to 200 m

RUSANOV,

SUBOTIN,

KHORYEV

et al. 2024

Sci. innov.

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Introduction. Increasing the share of balancing capacities to cover daily peaks in electricity consumption is one of the top priorities of the postwar development of Ukraine’s energy sector.Problem Statement. Today, power plant hydraulic turbines need both to increase effi ciency and to expand their operating range. For example, the new hydraulic units of the Dniester PSP shall operate in turbine mode in the range of 40—100% of rated capacity, while the four previous units operate in the range of 70—100%. This requirement can be met by increasing efficiency and reducing pulsations at low power output.Purpose. Based on studying the infl uence of blade spatial shape of a Francis pump-turbine runners on fl ow parthydrodynamics, to identify the patterns of pressure fluctuations distribution in draft tube diff user of the hydraulic unit model.Materials and Methods. Three options of models (the original and two modifi ed ones) have been studied onthe IMEP ECS-30 hydrodynamic test stand. The runner blades are made of PLA plastic by 3D printing. Pressurepulsations are measured by sensors at two points of draft tube diff user at a distance of 0.2 and 1.5 runner diameters from the runner bottom shroud.Results. Three modifi cations of the pump-turbine runner for heads up to 200 m have been designed and experimentally studied with the use of circumferential lean that diff er from the original version only in relative position of blade profiles. The analysis of obtained energy and pulsation characteristics of the models in turbine modehas shown that the model with the runner having a negative circular blade lean has the best performance. Conclusions. The determined influence of spatial shape of the runner blades on the energy and pulsation characteristics of the Francis pump-turbine model for heads up to 200 m has made it possible to increase its efficiency and to reduce the level of pressure fluctuations in the flow part.

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Section: Conclusion the Determined Infl Uence Of Spatial Shape Of The...mentioning

confidence: 99%