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

Analysis of unstable flow characteristics in the blade region of Francis pump-turbine under non-design conditions DOI

Jiawu Zhou,

Yuquan Zhang,

Yuan Zheng

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(1)

Published: Jan. 1, 2025

Under non-design situations, the Francis pump-turbine, a frequently employed core energy conversion device in pumped storage power plants, plays significant role ensuring their stable operation. This article examines unstable flow inside pump-turbine using gradient theory and numerical computations model experiments. Research has indicated that forced impacts separation between fluids blades are causes of deteriorating mechanical gradients, whereas non-optimal angles stay guide vanes can readily cause separation. The strong helical at blade inlet is primary flow, hub outlet locations for high shear force work area brought on by large-scale vortex structures, middle portion impeller where field begins needs more attention.

Language: Английский

Citations

0
Hidden Hydraulic Instability: Clearance Flow Dynamics During Pump-Turbine Pump Mode Startup DOI
Ming Xia, Zhengwei Wang, Wei Wang

et al.

Renewable Energy, Journal Year: 2025, Volume and Issue: unknown, P. 123312 - 123312

Published: May 1, 2025

Language: Английский

Citations

0
Phase classification and transient effects of the start-up process of multi-functional pump station in pump mode DOI
Xiaowen Zhang, Giorgio Pavesi, Zhe Xu

et al.

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 100, P. 113517 - 113517

Published: Aug. 28, 2024

Language: Английский

Citations

3
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