Pressure fluctuations in the vaneless space of High-head pump-turbines—A review

Zuo, Zhigang; Liu, Shuhong; Sun, Yuekun; Wu, Yulin

doi:10.1016/j.rser.2014.09.011

Cited by 148 publications

(61 citation statements)

References 21 publications

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“…For the large capacity pump-turbine unit, besides the efficiency and cavitation performances, the operation stability for both operating conditions should be guaranteed [3,28]. Under pump mode, instabilities with cavitation in the hump region limit the normal operating range of the unit.…”

Section: Discussionmentioning

confidence: 99%

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Parametric Design of an Ultrahigh-Head Pump-Turbine Runner Based on Multiobjective Optimization

et al. 2017

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Pumped hydro energy storage (PHES) is currently the only proven large-scale energy storage technology. Frequent changes between pump and turbine operations pose significant challenges in the design of a pump-turbine runner with high efficiency and stability, especially for ultrahigh-head reversible pump-turbine runners. In the present paper, a multiobjective optimization design system is used to develop an ultrahigh-head runner with good overall performance. An optimum configuration was selected from the optimization results. The effects of key design parameters-namely blade loading and blade lean-were then investigated in order to determine their effects on runner efficiency and cavitation characteristics. The paper highlights the guidelines for application of inverse design method to high-head reversible pump-turbine runners. Middle-loaded blade loading distribution on the hub, back-loaded distribution on the shroud, and large positive blade lean angle on the high pressure side are good for the improvement of runner power performance. The cavitation characteristic is mainly influenced by the blade loading distribution near the low pressure side, and large blade lean angles have a negative impact on runner cavitation characteristics.

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Section: Discussionmentioning

confidence: 99%

“…Interest in this technology has been renewed because of the increase in variable renewable energy, such as wind power [1,2]. In recent years, higher head and larger capacity PHES stations have been developed in order to reduce the construction costs [3].…”

Section: Introductionmentioning

confidence: 99%

Parametric Design of an Ultrahigh-Head Pump-Turbine Runner Based on Multiobjective Optimization

et al. 2017

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“…There was a confirmation in the usability of this fast prediction method in engineering practice in the site tests in Tianhuangping pumped storage plant. Liu et al [51,52] and [53] established through experimental and CFD calculations, that through the by utilization of four pre-opened guide vanes, great enhancement was observed in the S-shaped characteristics of a model pump-turbine. In the study of the effect of MGV on the pressure fluctuation in vaneless space among the runner and the guide vanes It is suggested that the instability of the force in the radial force increases as the shaft runner simulates the collapse of the symmetrical flow structure compared to the case of synchronized guide vanes Xiao et al a substantial reduction close to synchronous opening guide vanes through a numerical prediction was made by [54,55].…”

Section: Misaligned Guide Vane (Mgv)mentioning

confidence: 99%

Review on S-Shape Characteristics of Pump Turbine for Hydropower Generation

Adu¹

2017

EPES

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This paper presents and discussed the results of an experimental investigation of S-shape characteristics of pump turbine. An experimental study of pump turbine has been carried out by many researchers to study its characteristics. By using the experimental results of tested pump of some previous researchers, The Numerical analysis and Experimental studies on the S-shaped characteristics of a pump turbine model, Impact of Parameters on S-shaped characteristics, mechanism of the internal flow of pump turbines as well as measurements of pressure fluctuations on reduced-scale model pump-turbines have been discussed.

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Section: Introductionmentioning

confidence: 99%

“…The transient instable flow including the flow separation, back flow and rotating stalls can cause severe pressure fluctuations, resulting in the vibrations of pump-turbine, even reducing the operating life expectancy and accidents. Thus, it is very important and urgent to investigate the transient flow mechanism for reducing the unstable flow [1].Many numerical and experimental investigations on the unsteady flow that are rotor-stator interaction and rotating stall have been carried out on pump-turbine at pump mode and turbine mode at the constant flow rate [2][3][4][5][6][7]. In terms of research on the transient process, the transient processes that are runaway, no-load, load rejection and so on are studied in pump turbine at turbine mode by numerical simulation and experimental methods.…”

mentioning

confidence: 99%

Numerical investigation on transient flow of a high head pump-turbine in pump mode during rapid closure of guide vanes

Pavesi

Wang

2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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Transient flow in pump turbines appears because the hydropower storage plant needs to experience variable operation modes to make a balance between the electricity production and consumption, thus causing high-pressure fluctuations and shortening life expectancy. In this paper, three-dimensional numerical simulation, based on Detached Eddy Simulation (DES) turbulent model, was carried out to investigate the flow characteristics in a high head pump turbine in pump mode during rapid closure of wicket gates. The dynamic mesh technique was applied to simulate the rotation of the guide vane. In this work, the influence of water compressibility on pressure fluctuations was considered. The transient flow characteristics during load reduction were investigated by time-frequency analysis methods of the numerical data. KEYWORDS IntroductionLast decades have witnessed an increasing consumption of renewable energy due to the increasing price of fossil fuels and damage of carbon dioxide emissions on the living environment. The development of wind energy, solar power energy, hydropower energy and clean energy has been put into investigation for many years. However, it is a challenging task to control the stability of the output of renewable energy transmitted to the electricity grid because of stochastic nature of the renewable energy and fluctuating requirement of customers.In the renewable energy system, hydropower pump storage plant has been deemed as a costeffective electricity storage technology to balance the output of renewable electricity and need of the customers. Even though hydropower pump storage plants has such advantage, it needs change the operation modes between the pump mode and turbine mode frequently to meet the unpredictable need of electricity consumption, leading to transient instable flow in the pump-turbine under variable transient processes including the start-up, stop and adjusting rotating speed and so on. Besides, one of the common transient processes is that the wicket gates are required to open or close frequently. The transient instable flow including the flow separation, back flow and rotating stalls can cause severe pressure fluctuations, resulting in the vibrations of pump-turbine, even reducing the operating life expectancy and accidents. Thus, it is very important and urgent to investigate the transient flow mechanism for reducing the unstable flow [1].Many numerical and experimental investigations on the unsteady flow that are rotor-stator interaction and rotating stall have been carried out on pump-turbine at pump mode and turbine mode at the constant flow rate [2][3][4][5][6][7]. In terms of research on the transient process, the transient processes that are runaway, no-load, load rejection and so on are studied in pump turbine at turbine mode by numerical simulation and experimental methods. Cavazzini et al [8] simulated the transient flow in pump turbine at turbine mode under no-load condition. She pointed out that the head began to increase due to the fully developed rotating...

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Pressure fluctuations in the vaneless space of High-head pump-turbines—A review

Cited by 148 publications

References 21 publications

Parametric Design of an Ultrahigh-Head Pump-Turbine Runner Based on Multiobjective Optimization

Parametric Design of an Ultrahigh-Head Pump-Turbine Runner Based on Multiobjective Optimization

Review on S-Shape Characteristics of Pump Turbine for Hydropower Generation

Numerical investigation on transient flow of a high head pump-turbine in pump mode during rapid closure of guide vanes

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