2024
Wang, Wenjie; Qiu, Gai; Pei, Ji; Pavesi, Giorgio; Tai, Geyuan; Yuan, Shouqi
Effect of return channel on performance and pressure fluctuation of pump turbine Journal Article
In: Physics of Fluids, vol. 36, iss. 10, 2024, ISSN: 10897666.
Abstract | Links | BibTeX | Tags: Closure of Wicket Gate, Guide Vane Closure, Hydro plant control, Pumped hydro storage
@article{Wang2024,
title = {Effect of return channel on performance and pressure fluctuation of pump turbine},
author = {Wenjie Wang and Gai Qiu and Ji Pei and Giorgio Pavesi and Geyuan Tai and Shouqi Yuan},
doi = {10.1063/5.0229130},
issn = {10897666},
year = {2024},
date = {2024-01-01},
urldate = {2024-01-01},
journal = {Physics of Fluids},
volume = {36},
issue = {10},
publisher = {American Institute of Physics},
abstract = {To stabilize the operation of pumped storage power station, an orthogonal experimental design was proposed to optimize the return channel with the splitter blades of the pump turbine. The calculation results of various return channel models under multiple operating conditions indicated that inlet distance a1 and blade number z considerably affect the efficiency and flow pattern in the flow passage. The optimal scheme improved efficiency by nearly 3% at 0.6Qd. The Savitzky-Golay filtering method and Fast Fourier Transform were used to analyze the unsteady characteristics of the pump turbine in pump model. The amplitude of pressure pulsations at the blade passing frequency in the vaneless space and the interference zone between the guide vane and return channel reduced considerably, and the pressure pulsation amplitude in the vaneless zone decreased by 50%, 48%, and 20% for 0.6Qd, 1.0Qd, and 1.1Qd operating conditions. A Continuous Wavelet Transform was used to analyze frequency signals during the shutdown transition process. The optimization of the splitter blades improved the flow pattern in their corresponding flow passages and suppressed high-amplitude pressure pulsations in the unit for the stable operation of the pumped storage power station.},
keywords = {Closure of Wicket Gate, Guide Vane Closure, Hydro plant control, Pumped hydro storage},
pubstate = {published},
tppubtype = {article}
}
To stabilize the operation of pumped storage power station, an orthogonal experimental design was proposed to optimize the return channel with the splitter blades of the pump turbine. The calculation results of various return channel models under multiple operating conditions indicated that inlet distance a1 and blade number z considerably affect the efficiency and flow pattern in the flow passage. The optimal scheme improved efficiency by nearly 3% at 0.6Qd. The Savitzky-Golay filtering method and Fast Fourier Transform were used to analyze the unsteady characteristics of the pump turbine in pump model. The amplitude of pressure pulsations at the blade passing frequency in the vaneless space and the interference zone between the guide vane and return channel reduced considerably, and the pressure pulsation amplitude in the vaneless zone decreased by 50%, 48%, and 20% for 0.6Qd, 1.0Qd, and 1.1Qd operating conditions. A Continuous Wavelet Transform was used to analyze frequency signals during the shutdown transition process. The optimization of the splitter blades improved the flow pattern in their corresponding flow passages and suppressed high-amplitude pressure pulsations in the unit for the stable operation of the pumped storage power station.
2018
Pavesi, Giorgio; Xie, Zhanshan; Zheng, Yuan; Ge, Xinfeng; Mao, Xiu-li; Zheng, Yuan
A new method of dynamic mesh used in continuous guide vane closure of a reversible pump-turbine in generating mode Journal Article
In: Journal of Hydrodynamics, vol. 30, iss. 5, pp. 828-836, 2018, ISSN: 1001-6058.
Abstract | Links | BibTeX | Tags: Dynamic Mesh, Flow characteristics, Francis-type Reversible Turbine, Guide Vane Closure
@article{Pavesi2018b,
title = {A new method of dynamic mesh used in continuous guide vane closure of a reversible pump-turbine in generating mode},
author = {Giorgio Pavesi and Zhanshan Xie and Yuan Zheng and Xinfeng Ge and Xiu-li Mao and Yuan Zheng},
doi = {10.1007/s42241-018-0146-y},
issn = {1001-6058},
year = {2018},
date = {2018-01-01},
urldate = {2018-01-01},
journal = {Journal of Hydrodynamics},
volume = {30},
issue = {5},
pages = {828-836},
publisher = {Springer Nature},
abstract = {In this paper, a new method of dynamic mesh based on two functional controls is used in continuous guide vane closure, three-dimensional numerical simulation is carried out to investigate the transient flow characteristics for a Francis-type reversible pump-turbine under turbine mode in the load regulation scenario. Detached Eddy Simulation (DES) turbulent model is adopted. The transient flow characteristics during the closure of guide vanes are illustrated by analyzing the signals of mass flow, torque and pressure fluctuations in frequency and time-frequency domains. It is shown by simulating results that continuously assessment of the transient flow characteristics during guide vane closure is available by using the new method of dynamic mesh. Furthermore, the flow field analysis contains both the onset and the development of unsteady phenomena progressively based on an organized guide vane closure law. The flow pattern in return channel maintains a relatively stable flow field before the last stage of closure, compared with the unstable flow field in other domains. To identify the fluid-dynamical conditions causing unit variation, the influence of three-dimensional unsteady flow structures in passage is analyzed and its evolution during this transient process is characterized fluid-dynamically and spectrally.},
keywords = {Dynamic Mesh, Flow characteristics, Francis-type Reversible Turbine, Guide Vane Closure},
pubstate = {published},
tppubtype = {article}
}
In this paper, a new method of dynamic mesh based on two functional controls is used in continuous guide vane closure, three-dimensional numerical simulation is carried out to investigate the transient flow characteristics for a Francis-type reversible pump-turbine under turbine mode in the load regulation scenario. Detached Eddy Simulation (DES) turbulent model is adopted. The transient flow characteristics during the closure of guide vanes are illustrated by analyzing the signals of mass flow, torque and pressure fluctuations in frequency and time-frequency domains. It is shown by simulating results that continuously assessment of the transient flow characteristics during guide vane closure is available by using the new method of dynamic mesh. Furthermore, the flow field analysis contains both the onset and the development of unsteady phenomena progressively based on an organized guide vane closure law. The flow pattern in return channel maintains a relatively stable flow field before the last stage of closure, compared with the unstable flow field in other domains. To identify the fluid-dynamical conditions causing unit variation, the influence of three-dimensional unsteady flow structures in passage is analyzed and its evolution during this transient process is characterized fluid-dynamically and spectrally.
