Pressure characteristics and force analysis of pump turbine in variable-pressure outlet pump mode DOI
Xin Li, Zhenggui Li,

XU Lixin

и другие.

Physics of Fluids, Год журнала: 2024, Номер 36(12)

Опубликована: Дек. 1, 2024

A nonstationary numerical simulation was performed on the outlet pressure stabilization and periodic variable-pressure condition of a pump turbine model in pumping condition. The objective to dissect flow mechanism force characteristics components within probe into stability under such working conditions. Additionally, alterations runner state, distribution, pulsation, as well forces exerted top cover during this process were analyzed. results demonstrated that internal pattern conditions fluctuated periodically accordance with pressure. An augmented frequency variation led an elevation amplitude change. Nevertheless, hysteresis difference observed changes channel pattern. pulsation area influenced by rotation, static dynamic interferences lobe-free area, unsteady induced

Язык: Английский

Guide vane profile optimization of pump-turbine for grid connection performance improvement DOI
Fangfang Zhang,

Mingkun Fang,

Jiale Pan

и другие.

Energy, Год журнала: 2023, Номер 274, С. 127369 - 127369

Опубликована: Март 31, 2023

Язык: Английский

Процитировано

26

Effects of vortex rope formation in draft tube of reversible pump-turbine – A review DOI
Bhushan R. Rode, Arun Kumar

Journal of Energy Storage, Год журнала: 2024, Номер 99, С. 113250 - 113250

Опубликована: Авг. 8, 2024

Язык: Английский

Процитировано

10

Dynamic characteristic analysis of pressure pulsations of a pump turbine in turbine mode utilizing variational mode decomposition combined with Hilbert transform DOI
Xianghao Zheng, Suqi Zhang, Yuning Zhang

и другие.

Energy, Год журнала: 2023, Номер 280, С. 128148 - 128148

Опубликована: Июнь 16, 2023

Язык: Английский

Процитировано

20

The influence of optimization algorithm on the signal prediction accuracy of VMD-LSTM for the pumped storage hydropower unit DOI

Mingkun Fang,

Fangfang Zhang, Yang Yang

и другие.

Journal of Energy Storage, Год журнала: 2023, Номер 78, С. 110187 - 110187

Опубликована: Дек. 20, 2023

Язык: Английский

Процитировано

19

Stability and safety study of pumped storage units based on time-shifted multi-scale cosine similarity entropy DOI
Xiang Li,

Yakun Guo,

Boyi Xiao

и другие.

Journal of Energy Storage, Год журнала: 2024, Номер 95, С. 112611 - 112611

Опубликована: Июнь 25, 2024

Язык: Английский

Процитировано

9

Experimental Studies of Diffuser Fins Effect in Pump-Turbine Draft Tube on Pressure Pulsations in Turbine Mode DOI
Andrii Rusanov, Oleg Khoryev, Yevgen Agibalov

и другие.

Lecture notes in mechanical engineering, Год журнала: 2025, Номер unknown, С. 23 - 32

Опубликована: Янв. 1, 2025

Процитировано

0

Influence of Guide Vane Opening on the Runaway Stability of a Pump-Turbine Used for Hydropower and Ocean Power DOI Creative Commons
Di Zhu,

Wei Yan,

Weilong Guang

и другие.

Journal of Marine Science and Engineering, Год журнала: 2023, Номер 11(6), С. 1218 - 1218

Опубликована: Июнь 13, 2023

Runaway is a common phenomenon in pump-turbines for hydropower and ocean power, accompanied by strong instability, which can easily lead to accidents. This study reveals the stability during runaway process of pump-turbine, mainly exploring guide vane rejection happening transition conditions when dealing with or power. Through model experiments computational fluid dynamics numerical simulations, pressure pulsation reaching was compared under different opening angles. The amplitude measured experiment increases increase opening, but there are also local changes size peak. simulation results show that angle 12 degrees, vortex flow area between runner unit increases, leading instability. When 20 intensity does not change much distribution becomes uniform, resulting decrease fluctuations. field causes dissipation energy. Relationships be found among velocity field, intensity, entropy production. great significance ensuring stable operation pump-turbines.

Язык: Английский

Процитировано

6

Influence of the Trailing Edge Shape of Impeller Blades on Centrifugal Pumps with Unsteady Characteristics DOI Open Access

Zhengkai Song,

Yuxuan Chen, Tao Yu

и другие.

Processes, Год журнала: 2024, Номер 12(3), С. 508 - 508

Опубликована: Фев. 29, 2024

The flow field structure and pressure pulsation characteristics in two series of trailing edges a centrifugal pump are investigated using the SST k-w turbulence model. Series 1 involves varying impeller exit angle, 2 shape. entropy generation rate analysis method is used to evaluate numerical simulation results. Vortex cores within identified by applying Ω criterion. influence different edge configurations on energy loss pumps explored. dynamic mode decomposition (DMD) analyze pulsations at volute considering unsteady flows with shapes. findings suggest that shapes can be adjust proportions various components pump. In 1, efficiency remains nearly constant changes outlet angle both sides edge. 2, enhanced 1.18% elliptical shape (EBS) compared original (OTE) greater rates accompanied outlet. DMD results demonstrate noticeable impact distribution modes volute. Moreover, inhomogeneity coefficient under modes. This study holds great significance for selecting appropriate pumps.

Язык: Английский

Процитировано

2

Analysis of Hydraulic Losses in Vortex Rope Inside the Draft Tube of Francis Pump-Turbine Based on Entropy Production Theory DOI Creative Commons
Haobo Wang, Daqing Zhou, Junxun Guo

и другие.

Machines, Год журнала: 2023, Номер 11(10), С. 965 - 965

Опубликована: Окт. 16, 2023

The existence of vortex ropes inside the draft tube significantly impacts hydraulic efficiency and operational stability, few studies on formation mechanism loss problems have been explored. Hence, in this paper, we build an inherent correlation between local entropy production rate (LEPR) dynamics motion, by incorporating identification method Ω~R with theory, using OpenFOAM-v2212 software. From analysis caused turbulence dissipation (EPTD) is responsible for majority energy form rate, accounting about 87% total (TEPR) different load operations. Comparatively, wall shear stress (EPWS) can account up to 12%, while due direct (EPDD) plays a minor role TEPR. rotating rope movement unit at part conditions leads more intense LEPR. Therefore, determine rope, TEPR cross-section be used assess characteristics tube.

Язык: Английский

Процитировано

5

Hydraulic Characterization of Variable-Speed Pump Turbine under Typical Pumping Modes DOI Open Access

Linmin Shang,

Jingwei Cao, Zhengwei Wang

и другие.

Processes, Год журнала: 2023, Номер 11(10), С. 2903 - 2903

Опубликована: Окт. 2, 2023

The pump turbine is a crucial component of pumped storage hydropower plants. When operated at constant speed, it does not respond well to variations in the grid frequency. To improve hydraulic efficiency units, variable-speed units have been introduced. However, mechanism turbines has extensively studied numerically. In this study, flow characteristics were computed under two typical pumping modes, maximum head and minimum rate condition, as condition. results aligned with experimental results, changing trends thrust these modes discussed. error for Hmax, Qmin condition was 1.3%, Hmin, Qmax −1.9%. These values fell within reasonable range. research findings indicate that passage exhibited higher velocity, which 84.87 m/s, increased turbulence, larger pressure fluctuations, poorer unit stability. On other hand, both axial radial forces greater, there sudden changes extreme fluctuations over certain period time. It recommended avoid operating conditions during operations.

Язык: Английский

Процитировано

4