Stability Study and Strengthening Strategy of Spiral Case-Encased Concrete Structure of Pumped Storage Power Station DOI Open Access
Yun Zhao,

Xiji Li,

Yonggang Lu

et al.

Water, Journal Year: 2024, Volume and Issue: 16(18), P. 2687 - 2687

Published: Sept. 21, 2024

With the development of global hydropower, scale hydropower stations is increasing, and operating conditions are becoming more complex, so stable operation very important. The vibration turbine unit will cause resonance in powerhouse, structural stability powerhouse be affected. Many scholars pay attention to operation, there few studies on station. Therefore, this paper relies Weifang Hydropower Station project study key issues such as tensile strength concrete how arrange steel bars increase by changing material properties through FEA. Three schemes designed evaluate safety structure when running factor. Our findings indicate that stress variation patterns observed inner surface remain consistent across different scenarios. Notably, along spiral line worm section, we levels vertical loop decrease gradually with increasing distance from inlet. Conversely, concentrations arise near inlet tongue. Additionally, it has been noted likelihood cracking increases significantly at tongue region.

Language: Английский

Towards the pumped-hydro energy storage: improvement on the flow instability and cavitation performance with application-oriented forward skew angle of impeller blades DOI
Weixiang Ye, Huan Liu, Hong Wang

et al.

Energy, Journal Year: 2025, Volume and Issue: unknown, P. 134565 - 134565

Published: Jan. 1, 2025

Language: Английский

Citations

3
Effect of return channel on performance and pressure fluctuation of pump turbine DOI
Wenjie Wang,

Gai Qiu,

Ji Pei

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

To stabilize the operation of pumped storage power station, an orthogonal experimental design was proposed to optimize return channel with splitter blades pump turbine. The calculation results various models under multiple operating conditions indicated that inlet distance a1 and blade number z considerably affect efficiency flow pattern in passage. optimal scheme improved by nearly 3% at 0.6Qd. Savitzky–Golay filtering method Fast Fourier Transform were used analyze unsteady characteristics turbine model. amplitude pressure pulsations passing frequency vaneless space interference zone between guide vane reduced considerably, pulsation decreased 50%, 48%, 20% for 0.6Qd, 1.0Qd, 1.1Qd conditions. A Continuous Wavelet signals during shutdown transition process. optimization their corresponding passages suppressed high-amplitude unit stable station.

Language: Английский

Citations

12
An improved method of applying PSO-BP to optimize PAT energy efficiency based on entropy production theory DOI
Wentao Xu, Li Cheng,

Yuna Cui

et al.

Energy Conversion and Management, Journal Year: 2025, Volume and Issue: 327, P. 119472 - 119472

Published: Jan. 23, 2025

Language: Английский

Citations

0
Numerical investigation on the unstable flow and its interaction with the hump characteristic in a pump turbine at pump mode DOI
Weixiang Ye, Zhaohui Qian, Yongshun Zeng

et al.

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 101, P. 113853 - 113853

Published: Sept. 24, 2024

Language: Английский

Citations

2
Hydrodynamic Characteristics of Preloading Spiral Case and Concrete in Turbine Mode with Emphasis on Preloading Clearance DOI Open Access

Yutong Luo,

Zonghua Li, Shaozheng Zhang

et al.

Processes, Journal Year: 2024, Volume and Issue: 12(9), P. 2056 - 2056

Published: Sept. 23, 2024

A pump-turbine may generate high-amplitude hydraulic excitations during operation, wherein the flow-induced response of spiral case and concrete is a key factor affecting stable safe operation unit. The preloading can enhance combined bearing capacity entire structure, yet there still limited research on impact pressure hydrodynamic response. In this study, fluctuation characteristics dynamic behaviors steel under different pressures at rated operating conditions are analyzed based fluid–structure interaction theory contact model. results show that dominant frequency fluctuations in 15 fn, which influenced by rotor–stator with runner rotation short long blades. Under 0.5, 0.7, 1 times maximum static head, higher reduce regions, leading to uneven deformation stress distributions near-positive linear correlation. PSSC reach 2.6 mm, within allowable range. has little effect (15 fn), but both amplitudes increase pressure. regions along axial direction located near nose vane, values 0.003 mm 0.082 MPa, respectively. risk concentrations cracking high provide references for optimizing structural design selection pressure, improves reliability.

Language: Английский

Citations

1
Preloading Clearance Effects on Hydrodynamic Characteristics of Preloading Spiral Case and Concrete in Pump Mode DOI Open Access
Shaozheng Zhang, Xiaopeng Zhang,

Yutong Luo

et al.

Water, Journal Year: 2024, Volume and Issue: 16(21), P. 3122 - 3122

Published: Nov. 1, 2024

The spiral case plays a role in providing stable and uniform water flow the pump-turbine unit, overall structure with surrounding concrete is an important foundation for safe operation of unit power plant. In order to clarify comprehensive bearing capacity preloading steel under pump operating conditions, this study based on theory fluid–structure coupling contact model uses ANSYS CFX 2021 R1 mechanical analyze fluctuation characteristics dynamic structural response different pressures intermediate head condition. results indicate that main frequency pressure fluctuations inside (1 fn) influenced by unstable flow. state between closely related relative magnitude hydraulic pressure. Higher can lead increase initial clearance, resulting decrease area. vortex motion factor affecting distribution deformation. rotor–stator interaction also has certain impact vibration structure, even though influence already small. monitoring points where maximum values static stress are located different. Increasing value does not always guarantee safety structures, as sticking area early transfers most case, significant concentration. Under working conditions study, inner edge nose vane subjected excessive loads. Therefore, it necessary reinforce bars or other methods improve its tensile strength. A minimum 3.2 MPa beneficial reducing risk cracking. research provide deeper understanding behavior cases guide optimization design.

Language: Английский

Citations

1
Stability Study and Strengthening Strategy of Spiral Case-Encased Concrete Structure of Pumped Storage Power Station DOI Open Access
Yun Zhao,

Xiji Li,

Yonggang Lu

et al.

Water, Journal Year: 2024, Volume and Issue: 16(18), P. 2687 - 2687

Published: Sept. 21, 2024

With the development of global hydropower, scale hydropower stations is increasing, and operating conditions are becoming more complex, so stable operation very important. The vibration turbine unit will cause resonance in powerhouse, structural stability powerhouse be affected. Many scholars pay attention to operation, there few studies on station. Therefore, this paper relies Weifang Hydropower Station project study key issues such as tensile strength concrete how arrange steel bars increase by changing material properties through FEA. Three schemes designed evaluate safety structure when running factor. Our findings indicate that stress variation patterns observed inner surface remain consistent across different scenarios. Notably, along spiral line worm section, we levels vertical loop decrease gradually with increasing distance from inlet. Conversely, concentrations arise near inlet tongue. Additionally, it has been noted likelihood cracking increases significantly at tongue region.

Language: Английский

Citations

0