Investigation on reversible pump turbine flow structures and associated pressure field characteristics under different guide vane openings

Binama, Maxime; Su, Wen-Tao; Cai, Weihua; Li, Feng-Chen; Wei, Xianzhu; Muhirwa, Alexis; Gong, Ruzhi; Wekesa, David Wafula

doi:10.1007/s11431-018-9478-4

Cited by 18 publications

(6 citation statements)

References 61 publications

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“…Figure 1 shows a three-dimensional model for calculating the full flow path of a pump turbine. The various components of a pump turbine are modeled and assembled by three-dimensional modeling software, so as to extract the calculation domain for the next grid division, and then FLUENT or CFX software is used to simulate and analyze the internal flow conditions [2].…”

Section: Specific Problems Of Pressure Pulsationmentioning

confidence: 99%

Analysis of Pressure Fluctuation of Pumped Storage Units

Li,

Ma,

Sun

2023

J. Phys.: Conf. Ser.

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In pump turbines, the observation in the engineering field shows that pressure fluctuation has become one of the most serious hydraulic instability phenomena. The pressure pulsation will cause vibration and fatigue failure of the unit, even vibration of the plant, which greatly affects the safe operation of the power station. In this paper, the research on pressure fluctuation by domestic and foreign researchers is introduced and discussed. It includes the characteristics of pressure pulsation in various regions of pump turbines under various operating conditions, existing research methods, and the possibility of improving pressure pulsation problems with variable-speed pumped storage units, which will serve as the basis for further research and improvement of pressure pulsation.

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Section: Specific Problems Of Pressure Pulsationmentioning

confidence: 99%

Analysis of Pressure Fluctuation of Pumped Storage Units

Li,

Ma,

Sun

2023

J. Phys.: Conf. Ser.

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“…Owing to its ability to quickly change its operations from high to low power generation or vice versa, hydropower ranks among the most efficient means to deal with RES-inflicted grid instabilities [13,14]. In these plants, Francis turbines constitute roughly 60% of the worldwide installed capacity and are either used for base load generation or, as mentioned above, stabilization of electrical power grids [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Francis Turbine Cavitation Performances of a Hydro-Energy Plant

Zhao

Binama

et al. 2022

Sustainability

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An investigation is conducted on the Francis turbine’s cavitation characteristics and its influence on system hydraulic stability using two experimental methods, namely the flow visualization and acoustic emission methods. The investigated turbine is of Francis type with a 15-blade runner and has a specific speed of 202 rpm and a rated head of 30 m. Having tested the machine under a wide range of cavitation conditions, the gap cavitation is the earliest to develop as the cavitation coefficient gradually decreases and has no obvious effect on the machine’s external performance characteristics. The airfoil cavitation follows and causes the increase and decrease in machine flow rate and head, respectively, showing its drag reduction effect, where, at the same time, the pressure pulsation amplitude gets to its peak value. There is also the formation of constant cavitation zones and the involvement of an unsteady surge close to the wall of the draft tube’s cone. Pushing the cavitation coefficient to even lower values, there is the formation of an annular cavitation zone, accompanied by a sharp drop in cone pressure pulsation amplitudes while the former drag reduction effect disappears. The trend of noise is basically the same as that of pressure fluctuation, which confirms its trustworthiness when it comes to cavitation occurrence detection within Francis turbines.

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“…Research on the improvement of pumped storage units in terms of efficiency and regulation characteristics has been the focus for many years [10][11][12]. Due to the reversibility of pumped storage units, the hydraulic design cannot meet the parameter requirements in both operating modes, Therefore, the unit is likely to operate at the off-design point for a long time, resulting in low efficiency, which is not conducive to the service life of the runner [13,14]. To solve this problem, the key technology of Figures 1 and 2.…”

Section: Introductionmentioning

confidence: 99%

“…To improve the regulation performance of hydropower units, some studies ha of the runner [13,14]. To solve this problem, the key technology of variable-speed pu storage units with fast response capability and wide adjustment range has been pro and studied [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Regulation Characteristics and Load Optimization of Pump-Turbine in Variable-Speed Operation

Wang

2021

Energies

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In order to improve the operating and regulation characteristics of the hydropower unit and to stabilize the load fluctuations, variable-speed pumped storage technology based on converters has been proposed and given more attention recently. However, different from the conventional units, due to the variability of operation conditions, variable-speed units need to develop a load optimization strategy in terms of operating parameter identification to ensure state matching for operation. Therefore, this paper proposes an optimization search step based on the model test curve, and the process of parameter optimization search is elaborated and calculated in the turbine operating condition and pump operating condition, respectively. A mathematical model of the turbine regulation system is established to analyze the influence of speed and guide vane related parameters on the regulation characteristics, and the achievable operating range and regulation capacity in the variable-speed condition is pointed out based on pump-turbine model test, as well as the advantages over the fixed-speed operation. The results show that by applying the load optimization method, the variable-speed unit can be significantly improved in terms of operating efficiency, especially at low head and low power conditions. Meanwhile, a certain range of active power regulation can be realized by the decoupling control of the converter and measuring the guide vane opening in both modes. The analysis of the model test verifies the effectiveness of the variable-speed regulation operation of pump-turbine and provides a reference for the design and operation of the variable-speed hydropower units.

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Investigation on reversible pump turbine flow structures and associated pressure field characteristics under different guide vane openings

Cited by 18 publications

References 61 publications

Analysis of Pressure Fluctuation of Pumped Storage Units

Analysis of Pressure Fluctuation of Pumped Storage Units

Experimental Francis Turbine Cavitation Performances of a Hydro-Energy Plant

Regulation Characteristics and Load Optimization of Pump-Turbine in Variable-Speed Operation

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