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

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

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