Experimental study of pressure pulsation in a large-scale hydropower plant with Francis turbine units and a common penstock

Jamali, Reza; Sohani, Ali; Hemmatpour, Khosro; Behrang, M.A.; Ghobeity, Amin

doi:10.1016/j.ecmx.2022.100308

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…The study of unsteady phenomena in draft tu bes and runners of hydraulic machines is carri ed out both by numerical methods and on experimental facilities [8,9]. The data obtained at real hydropower facilities are of the greatest value [10], since they make it possible to adjust the pa ra meters of both the numerical experiment and the experiment on reduced models of the hyd rau lic machine [11]. Due to the complexity and danger of conducting full-scale experiments, the most common practice…”

Section: Nomenclaturementioning

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: Nomenclaturementioning

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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show abstract

“…In recent years, experiments and simulations of hydraulic turbines have been carried out by domestic and foreign scholars. Reza et al studied the pressure fluctuation of large hydropower stations with Francis turbine units and found that the pressure fluctuation is significant at lower power levels, and many pressure waves caused by turbulence in the running unit waterway have a great impact on adjacent units [3]. Tang et al studied the Francis turbine inner vortex characteristics by using numerical methods [4].…”

Section: Introductionmentioning

confidence: 99%

Study on the design of short blade offset for the long and short blade runner of 1000 MW hydraulic turbine units

Lu,

Zhang,

Chen

et al. 2024

J. Phys.: Conf. Ser.

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For such complex rotating machinery as hydraulic turbine, the hydraulic operation characteristics of the hydraulic turbine unit are significantly impacted by the short blade of the runner used as the splitter blade. To find the optimum position of the short blade, the study object is the 1000 MW hydraulic turbine, selects three circumferential offset positions of the short blade for numerical simulation calculation, obtains the runner flow pattern at different offsets, and explores the impact on the short blade offset on the vortex and pressure pulsation in the runner. The results show that the counterclockwise offset of the short blade will improve the flow pattern of the runner, reduce the scale of vortex in the runner and enhance the efficiency of the hydraulic turbine. The counterclockwise offset will increase the interference while decreasing the pressure pulsation in the vaneless region, at the runner’s inlet, and downstream of the short blade. When the offset δ=0.6, the peak-valley difference of pressure fluctuation in the vaneless zone is the smallest, accounting for only 1.38 % of the rated head. The main frequency of the vaneless zone gradually changes from 15fn to 30fn , and the main frequency of the runner inlet and the short blade downstream is 24fn . Due to the different weakening effects of short blades on the interference, low-frequency pulsation components of 4fn and 8fn appear.

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Quantification of abnormal characteristics and flow-patterns identification in pumped storage system

Chen,

Zhao,

et al. 2024

Nonlinear Dyn

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Experimental study of pressure pulsation in a large-scale hydropower plant with Francis turbine units and a common penstock

Cited by 7 publications

References 41 publications

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

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

Study on the design of short blade offset for the long and short blade runner of 1000 MW hydraulic turbine units

Quantification of abnormal characteristics and flow-patterns identification in pumped storage system

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